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Pouya Kouch (University of Turku)26/05/2026, 09:00Oral
(to be added)
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Luc Rouppe van der Voort26/05/2026, 09:15
(TBD)
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Arnolds Ubelis (National Science Platform FOTONIKA-LV at the University of Latvia)26/05/2026, 09:27
[This contribution has a poster also]
The National Science Platform (NSP) FOTONIKA-LV of the University of Latvia (https://fotonika-lv.eu/) was created in 2018 to serve as a centre of excellence and as a strong, welcome partner/coordinator in consortia for EU Research and Innovation Framework Programme projects. The platform's research focus is on photonics sciences and space research. NSP...
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Hans Kjeldsen (Instrument Centre for Danish Astrophysics, Aarhus University, Denmark), Mai Korsbæk (Instrument Centre for Danish Astrophysics)26/05/2026, 09:39
[This contribution has a poster also]
The Instrument Centre for Danish Astrophysics (IDA) is a national strategic coordination platform dedicated to strengthening Danish astrophysics and space science. Funded by the Danish Agency for Higher Education and Science, IDA provides the structural and strategic framework that enables Danish researchers and students to fully exploit international...
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Petri Väisänen (University of Turku)26/05/2026, 09:51
The Finnish Centre for Astronomy with ESO, FINCA, is a national research entity, supported by four universities, established soon after Finland joined ESO. It's mandate is to promote astronomical research in the country, ESO-focused science in particular, and participate in both training and relevant technology projects: in short, to make sure Finland benefits from its ESO membership. I will...
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Petri Väisänen (University of Turku)26/05/2026, 10:03
The Nordic Optical Telescope, NOT, has been a key presence in observational astronomy of the Nordic countries for 35 years. It has had a significant role in training generations of Nordic astronomers, while doing world-class science. In this overview talk, I will briefly present some highlights, the current status of the telescope and operations, and also discuss its role and goals into the...
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Garrelt Mellema (Stockholm University)26/05/2026, 10:45
In this talk I will highlight a selection of science topics for which the SKA Observatory is expected to make major progress. The SKA telescopes, SKA-Low and SKA-Mid have been designed to be the largest radio inteferometers in each of their frequency ranges (50 - 350 MHz and 0.35 - 15.4 Ghz, respectively) and are expected to deliver transformational results in a broad range of topics, ranging...
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Thijs Geurts26/05/2026, 11:23
In this talk I will present the current status of the SKA Observatory as an intergovernmental organisation, building the two largest telescope arrays in the world, located in South Africa and Australia, made possible through a global collaboration of 15 countries worldwide. The presentation will give an overview of the current Membership picture and its activities around construction and...
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Daniel Tafoya (Onsala Space Observatory)26/05/2026, 12:00Poster
We present a collection of open-source software utilities developed within the Nordic ALMA Regional Centre to support the analysis of radio interferometric data. The tools address crucial aspects of the interferometric workflow, including direct model fitting in the visibility domain, stacking of continuum and spectral-line emission to enhance sensitivity, early data-quality diagnostics using...
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Sabine König (Chalmers University of Technology, Onsala Space Observatory)26/05/2026, 12:01Poster
Our mission at the Nordic ARC node is to fully support all ALMA users, primarily in the Nordic and Baltic countries, from proposal development and submission, to observation preparation, and data reduction and analysis, as well as support of ALMA archival science. In addition to general support services we offer specialist scientific and technical expertise. This includes imaging techniques...
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Julia Martikainen (Nordic Optical Telescope)26/05/2026, 12:02Poster
The Canary Island observatories, operated by the Instituto de Astrofísica de Canarias (IAC), constitute one of the leading astronomical observing sites worldwide. Located at the Observatorio del Roque de los Muchachos (La Palma) and the Observatorio del Teide (Tenerife) in Spain, the sites offer excellent atmospheric conditions, with stable seeing, and a high fraction of clear nights.
The...
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Joonas Viuho (NBI, NOT)26/05/2026, 12:03Poster
The La Palma Quantum Interferometer (LPQI) is an innovative project in optical intensity interferometry lead by Instituto de Astrofísica de Andalucía (IAA), designed to harness the exceptional observing conditions and infrastructure at the Observatorio del Roque de los Muchachos (ORM) on La Palma managed by the Instituto de Astrofísica de Canarias (IAC). In its first phase, the LPQI-Pathfinder...
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Sergio Armas (Nordic Optical Telescope - Aarhus Universitet)26/05/2026, 12:04Poster
We present a new FAIR-compliant interface for accessing data from the Nordic Optical Telescope (NOT). The platform enables comprehensive FITS-level filtering, allowing researchers worldwide to query observations from the beginning of NOT operations up to the one-year proprietary period.
The system supports both simple and advanced queries, including filtering by file and target name...
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Michael I. Andersen (DAWN Cosmology Centre, Niels Bohr Institute, University of Copenhagen)26/05/2026, 12:05Poster
BLAST is going to monitor the sky for transients at high time resolution. The core science cases are detecting: 1) short lived bright transients, 2) slower transients, like SNe, 3) Jupiter like transiting planets in Jupiter like orbits, 4) asteroids heading towards Earth. We are building prototypes of very wide field cameras, that in pairs monitor each 1.1% of the sky (450 sqr degrees) with a...
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Tõnis Eenmäe26/05/2026, 12:06Poster
The AZT-12 1.5-m telescope at Tartu Observatory offers unique guaranteed access to objects in the Northern Hemisphere, facilitating long-term monitoring of various targets. This instrument has recently undergone significant upgrades, including the installation of a medium-resolution fibre-fed echelle spectrograph covering a wavelength range from 380 nm to 910 nm. This spectrograph offers...
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Heitor Ernandes (CAMK - PAN)26/05/2026, 12:07Poster
Understanding the origin and evolution of carbon, nitrogen, and oxygen (CNO) is key to reconstructing the chemical history of the Milky Way and its earliest star-forming environments.
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Within the framework of the larger DAINA CNO project, in collaboration with Poland and Lithuania, we aim to trace the enrichment of these elements across Galactic populations through a homogeneous,... -
Alice Knutas (Chalmers University of Technology)26/05/2026, 12:08Poster
Cosmic rays provide non-thermal pressure in the interstellar medium (ISM), affecting star formation and galactic winds, which in turn alter phase structure and pressure balance in the circumgalactic medium (CGM). Recent numerical studies have shown that these effects depend strongly on the diffusion of cosmic rays in the ISM, typically quantified by an effective diffusion coefficient. Methods...
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Gabor Racz (University of Helsinki)26/05/2026, 13:15Oral
In cosmology, N-body simulations are a fundamental computational tool used to track the non-linear growth of cosmic structures. While the global topology of our Universe is still an open question, cosmological N-body simulations are almost exclusively run in a non-trivial T^3 (3-torus) topology due to a mere numerical convenience. In this talk, I will demonstrate how the choice of a global...
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Tapio Pursimo (nordic optical Telescope)26/05/2026, 13:15
Nordic Optical Telescope (NOT) has been a success story of Nordic
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collaboration in astronomy. Multi-messenger and
time-domain astronomy have been popular amongst our users. Examples
being nightly
monitoring of gravitational lens for two years; transient followups
from sky surveys such as ZTF, Gaia, SVOM etc. and monitoring of
TeV sources, jointly with MAGIC.
Recently NOT has been the... -
Varpu Ahlberg (University of Turku)26/05/2026, 13:15
Ultraluminous X-ray sources (ULXs) are off-nuclear objects with apparent luminosities exceeding the Eddington limit for accreting stellar-mass black holes. Past this limit, radiation pressure dominates gravity, and the excess supply of matter would be ejected. To explain such high luminosities, the source emission is thought to be strongly collimated by the radiatively driven winds. Certain...
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Zoe Rhiannon Jones (Tartu Observatory)26/05/2026, 13:30Oral
We explore the relationships between the cosmic environments of galaxies and their own physical properties through large-scale statistics, with the ultimate goal of being able to predict a galaxy's most likely cosmic environment from its SED and properties alone. To do so, we are developing a tool to compare the SEDs of large samples of galaxies in order to find similarity between them. We...
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Julia Martikainen (Nordic Optical Telescope)26/05/2026, 13:30
The Nordic Optical Telescope (NOT) is a 2.56-m optical telescope located at the Observatorio del Roque de los Muchachos on La Palma, Spain. This contribution gives a short overview of the observing modes of the telescope, including imaging, spectroscopy, and polarimetry, and highlights its rapid response mode (RRM) and non-sidereal tracking capabilities. The NOT’s versatility and efficiency...
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Sofia Blomqvist (University of Helsinki)26/05/2026, 13:30
We perform a model-agnostic Bayesian analysis of the neutron-star-matter equation of state (EoS), using known ab-initio constraints and astrophysical observations to limit possible EoS behaviors at intermediate densities. Permitting explicit first-order phase transitions allows us to systematically search for twin-star solutions, i.e. the existence of stars degenerate in mass but differing in...
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Kristers Nagainis (Institute of Astronomy, University of Latvia)26/05/2026, 13:45Oral
The thermal and kinetic Sunyaev-Zel'dovich effects (tSZ and kSZ, respectively) are the secondary anisotropies of the cosmic microwave background (CMB). Even though these effects are difficult to distinguish in CMB observations, they have been detected by Planck and the Atacama Cosmology Telescope (ACT).
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tSZ and kSZ carry extensive information about the underlying cosmology and structure... -
Johan Fynbo (Niels Bohr Institute)26/05/2026, 13:45
I will present the status of the NOT Transient Explorer - the new instrument for the Nordic Optical Telescope that is under construction with contributions from several Nordic partners. I will describe the design of the instrument, its capabilities, and outline the main remaining challenges still ahead of us.
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Anastasiia Bocharova (University of Turku)26/05/2026, 13:45
The soft state spectrum of X-ray binaries exhibits a high-energy tail extending beyond 500 keV that cannot be explained by standard thermal disk emission models alone. The launch of IXPE has enabled X-ray polarimetry, which is sensitive to system geometry and can therefore provide new constraints on viewing angle and corona configuration. We aim to develop a self-consistent...
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Joonas Viuho (NBI, NOT)26/05/2026, 14:00
NOT has come to a mature age soon celebrating its 40 years in operation. Throughout the years NOT has remained as a highly competitive facility due to its advanced design, versatile instrument suite and control system, and flexible operations model. To ensure continued high level of competitiveness for the coming decades, it is time to consider technical updates and upgrades of the telescope....
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Ivelin Georgiev (Stockholm University)26/05/2026, 14:00Oral
During the Epoch of Reionization (EoR), the ultraviolet radiation from the first stars and galaxies ionized the neutral hydrogen in the intergalactic medium (IGM), which can emit radiation through the 21-cm hyperfine transition. Due to this, the 21-cm signal from the EoR is a direct probe of the IGM and the first ionizing sources, and its measurement is a key science priority of radio...
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Jakub Cehula (Tartu Observatory, University of Tartu)26/05/2026, 14:00
Magnetar giant flares are the most powerful non-cataclysmic neutron star outbursts, capable of releasing more than 1e46 ergs of magnetic energy within a fraction of a second. In recent work, we showed that giant flares can eject neutron-rich material from the magnetar crust and that radioactive decay in this ejecta produces delayed MeV gamma-ray emission consistent with a previously...
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Mikael Granvik (University of Helsinki, Finland / Luleå University of Technology, Sweden)26/05/2026, 14:45Oral
The interiors of asteroids, that is, their bulk composition and structure, are largely unknown today except for a few special cases. Apart from drilling and radar sounding, both of which are techniques yet to be applied to asteroids, let alone applied to a large number of asteroids, our knowledge of asteroid interiors is based on indirect observations such as rotation rates as well as the...
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Derek McKay (Aalto University)26/05/2026, 14:45
Metsähovi Compact Array (MCA, https://www.metsahovi.fi/mca) is a radio telescope system, comprising at least three 5.5-metre parabolic dish antennas and operating at frequencies from 4 to 8 GHz. It is being built at the Aalto University Metsähovi Radio Observatory in Kirkkonummi, Finland. In the past two years, major progress has been made on the project. The MCA's premier scientific programme...
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Lauri Sassali26/05/2026, 14:45
The cold gas in galaxies shows continuous turbulent motions occurring at various spatial scales that exceed those associated with thermal motions, as inferred from the observed HI velocity dispersions, implying a need for a continuous source of energy input. Supernova (SN) feedback is considered to be one of the primary candidates for this, because of its substantial energy output,...
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Grigori Fedorets (FINCA)26/05/2026, 15:00Oral
Asteroids comprise of material left over from the early days of the formation of the Solar System. Studying their physical composition and dynamical evolution are among the best evidence for the initial conditions and dynamical evolution of the Solar System. Asteroids come in sizes from metres up to hundreds of kilometres. Currently, essentially no data exist on the very small asteroids...
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Jakobus Vorster (University of Helsinki)26/05/2026, 15:00
Young high mass stellar objects (HMYSOs, $M_* > 8 M_\odot$) contribute significantly to the energetics of the interstellar medium through radiation fields and supernovae. However, they are rare, and form in deeply embedded cores. Simulations suggest that they gain $\sim 50\%$ of their initial mass in short bursts of accretion in $\sim 3 \%$ of their formation time. A few accretion bursts in...
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Wilma Kiviaho (Paris Observatory)26/05/2026, 15:00
Cepheid variables serve as fundamental standard candles for calibrating the extragalactic distance scale. The high-precision parallaxes from Gaia now enable a sub-percent calibration of the Period-Luminosity (PL) relation for Milky Way (MW) Cepheids. However, interstellar extinction remains the main source of uncertainty, as the Cepheids’ variability complicates direct reddening...
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243. Compositional properties of near-Earth binary asteroid (163693) Atira from Nordic observatoriesEric MacLennan (Instituto de Astrofísica de Canarias)26/05/2026, 15:15Oral
The near-Earth asteroids having orbits completely interior to Earth's are referred to as Atira class, named after the first discovered member (163693) Atira. This asteroid is the only confirmed binary asteroid in the Atira class with a primary component size of nearly 5 km orbited by a smaller $\sim$1 km secondary. Radar imaging (Deleon et al. 2024) used to detect the secondary has been used...
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Siddharth Kumar (Chalmers university of technology)26/05/2026, 15:15
Magnetic fields are a fundamental component of the interstellar medium (ISM), yet they cannot be observed directly and must instead be inferred through indirect tracers. Polarized thermal dust emission is a good tracer of magnetic fields in many ISM conditions, as dust grains are generally expected to be well aligned with the magnetic field. In this work, we investigate the leading theory of...
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Bela Dixit (Metsähovi Radio Observatory, Aalto University)26/05/2026, 15:15
Aalto University’s Metsähovi Radio Observatory in Kirkkonummi has been carrying out radio astronomical observations for 50 years. Its 14-meter telescope mainly operates at 37 GHz with a 1 GHz bandwidth, mostly in single-dish mode, but also supports VLBI observations at 22, 43, and 86 GHz. Metsähovi has recently ordered a new triple-band receiver from the Max-Planck-Institut für Radioastronomie...
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Riku-Petteri Rautio (University of Oulu)26/05/2026, 15:30
Diffuse ionized gas (DIG) is an important component of the interstellar medium that is strongly connected to both star formation and feedback. The primary ionization mechanism of DIG is thought to be hard radiation from midplane OB stars. However, the emission spectrum of DIG shows features (such as enhanced [OIII] line emission) that models including only photoionization by midplane OB stars...
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Kelley Michelle Hess (Onsala Space Observatory/Chalmers University)26/05/2026, 15:30
SKA will be the first telescope to usher in a new era of how the astronomical community will interact with observational data. With data volumes approaching exabytes per year in the next decade, the SKA community is developing, through an international coordinated effort, a series of SKA Regional Centers (SRCs) in a global distributed SRC Network (SRCNet). At the Swedish SRCNet node we are...
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Joseph DeMartini (University of Helsinki)26/05/2026, 15:30Oral
The upcoming close encounter of asteroid 99942 Apophis with Earth in 2029 presents a once-in-7000-years opportunity to study the dynamics, bulk properties, and interior structure of a potential rubble-pile asteroid as it passes deeply through Earth’s gravitational field. Numerical modeling—including via Discrete Element Methods (DEMs)—has helped to develop our understanding of the dynamics and...
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Ilgmars Eglitis (University of Latvia, ESTF, Institute of Astronomy)26/05/2026, 16:15
Studies of small bodies of the Solar System
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Astronomers at the Baldone Observatory conduct extensive studies of small bodies in the Solar System using the Schmidt telescope. One major research direction involves measuring the positions and brightness of these objects in the U, B, V, R, and I photometric filters. Using this telescope, 149 new asteroids have been discovered, including a... -
Maret Einasto (Tartu Observatory, Tartu University)26/05/2026, 16:15
Understandng the properties, formation and evolution of the cosmic web is one of the main tasks
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in cosmology.
In my talk I introduce the largest structures in the cosmic web, and the compatibility
of these structures with the LCDM cosmolocigal model.
Namely, in the Local Universe the richest structures in the cosmic web are very rich galaxy superclusters
and their compelxes - the Sloan... -
Mari-Liis Aru (Imperial College London)26/05/2026, 16:15Oral
Protoplanetary disks emerge as a consequence of the star formation process, and provide the foundational material for planets. The evolution of these disks is governed by a combination of internal processes linked to the central star, and external influences from the surrounding environment. Both pathways produce photoevaporative winds that drive disk dispersal from opposite directions. In...
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Ross Church (Astrophysics division, Lund University)26/05/2026, 16:30
4MOST is a project to build a multi-fibre spectrograph and use it to carry out a massive spectroscopic survey of stars and galaxies. The 4MOST consortium has members from across the Nordic and Baltic nations with diverse interests including galactic structure and history, stellar populations and observational cosmology. The instrument has been installed and commissioned on ESO's VISTA...
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Stefan Schuldt (FINCA)26/05/2026, 16:30
Strong gravitational lensing by galaxy clusters is a powerful tool to probe various properties of the Universe. It enables precise reconstructions of cluster mass distributions, detailed studies of high-redshift galaxies through lensing magnification, and measurements of cosmological parameters such as the Hubble constant, H0, using time-variable strongly lensed sources such as SN Refsdal in...
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Dainis Dravins (Lund Observatory, Lund University, Sweden)26/05/2026, 16:30Oral
Many exoplanets have been found, but still no Earth-like planet in a one-year orbit around a solar-type star. Limitations no longer stem from observations but from the physical variability of the host star, which greatly exceeds the radial-velocity modulation by an Earth-like planet. Current observational efforts are to find planets around our Sun, monitoring the Sun-as-a-star with extreme...
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Alexandra Lehtmets (University of Tartu, Tartu Observatory)26/05/2026, 16:45Oral
Exoplanet atmospheres provide a direct window into planetary physics, chemistry, and long-term evolution. Through their composition and structure, we can probe processes such as irradiation, circulation, and mass loss, which ultimately shape how planets form and survive. Close-in gas giants, particularly hot and ultra-hot Jupiters, represent some of the most extreme laboratories for these...
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Varun Varun (KTH Royal Institute of Technology)26/05/2026, 16:45
The advent of X-ray polarimetry has marked a major advancement in high-energy astrophysics, driven by the successful launch of IXPE and its groundbreaking measurements in the soft X-ray band (2–8 keV). Currently, several efforts are underway for getting more significant results in hard X-rays provided by previous missions like PoGo+. XL-Calibur is a balloon-borne hard X-ray polarimeter...
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Jad Mansour (Tartu Observatory, University of Tartu)26/05/2026, 16:45
Cosmic voids are sensitive probes of galaxy formation and evolution, but their identification in photometric surveys is complicated by redshift uncertainties. In this work, we simulate the observational limitations of the J-PAS photometric survey by modelling photometric redshift errors based on the J-PAS Internal Data Release using the FLAMINGO hydrodynamical simulation. We construct two...
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Kelly Kelder (University of Tartu; University of Turku)26/05/2026, 17:00
Galaxy groups and clusters are some of the most massive gravitationally bound structures in the Universe. Located at the nodes of the cosmic web, these systems are laboratories for analysing theories of both galaxy evolution and cosmology. In such models, groups and clusters provide an excellent tool for constraining cosmological parameters through their mass functions. However, this approach...
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Marius Maskoliūnas (Institute of Theoretical Physics and Astronomy. Vilnius university)26/05/2026, 17:00
The European Astronomical Society of Small Telescopes (EASST) is a non-profit organization dedicated to enabling high-quality astronomical research with small and medium aperture telescopes. Within this framework, the Black Hole Target and Observation Manager (BHTOM) has been developed as a robust, web-based observational coordination system designed to support both professional and amateur...
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Nikki Miller (Uppsala University)26/05/2026, 17:00Oral
Over 70% of stars in the local solar neighbourhood are M-dwarfs, and they are frequent hosts of exoplanets. However, their cool, complex atmospheres and intrinsic faintness present significant observational and modelling challenges. The upcoming PLATO mission is expected to observe over 5000 early- to mid-type M-dwarfs, providing high-precision light curves for exoplanet detection, along with...
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Marylyn Rosenqvist26/05/2026, 17:15Oral
Resonant exoplanetary systems, in which the period ratio between consecutive planets is close to a natural number, are relatively rare in the universe. However, the fine-tuning required for these orbital configurations make resonant systems valuable for studying the early stages of planet formation and evolution. Additionally, the strong transit timing variations (TTVs) arising from the mutual...
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Kostas Valeckas (Nordic Optical Telescope, Copenhagen University)26/05/2026, 17:15
We present PyLongslit, a simple and transparent Python pipeline for processing astronomical long-slit spectroscopy data obtained with CCD detectors. The software is designed to prioritize manual execution, robustness, and pedagogical clarity, providing an accessible alternative to highly automated “black-box” reduction pipelines. The pipeline emphasizes visualization and quality assessment...
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Anne Liljeström (Ursa Astronomical Association)26/05/2026, 17:15
Finland has a long history of communicating astronomy to the public. Finland also (allegedly!) has the largest number of amateur astronomers per capita in the world. The nationally operating Ursa Astronomical Association is currently the most active and versatile it’s ever been during its over a hundred years of activities.
We must be doing something right! So what have we been doing?...
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Gaitee Hussain27/05/2026, 09:00
The European Space Agency, ESA, celebrated its 50th anniversary in 2025. Over this time the agency has expanded considerably and taken on new programmes and functions to ensure European leadership in all aspects of Space for the next 50. The ESA Science programme has been an integral part of ESA from its inception and has delivered remarkable firsts in Space Science. In this talk I will give a...
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Nora Lützgendorf27/05/2026, 09:38
This talk will highlight key scientific results from recent ESA missions across astrophysics, planetary science, and heliophysics, showcasing how space-based observations advance fundamental research and technological innovation. It will also outline opportunities for scientists to engage with ESA missions, including participation in science teams, working groups, and advisory committees, as...
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Timo Prusti27/05/2026, 10:45
The operational phase of the Gaia mission is over and the fourth data release (DR4) covering the nominal 5 year mission will come out in December 2026. Work has also started for the final legacy archive covering the whole 10+ years of data (DR5). DR5 is planned for 2030. The mission, data processing and selected highlight science results will be shown together with information of what to...
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David Hobbs27/05/2026, 11:23
Our Galaxy contains many different types of stars and planets, interstellar gas and dust, and dark matter. These components are widely distributed in age, reflecting their formation history, and in space, reflecting their birth place and subsequent motion. Objects in the Galaxy move in a variety of orbits that are determined by the gravitational force, and have complex distributions of...
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Synne Sigstad Jørgensen (University of Oslo)27/05/2026, 12:00Poster
The main aim for the next generation of Cosmic Microwave Background (CMB) experiments is the detection of B-mode polarisation; a discovery that will serve as a smoking gun for the theory of inflation. While these experiments are well optimized for observing polarized emission, they must also mitigate the effects of numerous systematics to be able to achieve their target sensitivities. One such...
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Talvikki Hovatta (University of Turku)27/05/2026, 12:01Poster
Magnetic fields are thought to play a crucial role in both launching and collimation of blazar jets. 3C273 is our nearest high-power radio-loud quasar, and as such it has been extensively studied since the 1960s. ALMA has opened a new window for studying the jet of 3C273 at millimeter wavelengths. I will present results from a recent study where we have observed both the nucleus and the...
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Marianne Vestergaard (Niels Bohr Institute, University of Copenhagen)27/05/2026, 12:02Poster
Despite decades of study of the (variable) nuclear emission from active galactic nuclei, we still do not fully understand the nature of the accretion flow around supermassive black holes and its impact on its immediate surroundings. Objects that vary dramatically on ultra-short timescales of months to years, such as changing-look/changing-state AGN, offer a new means to gain valuable insight...
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Liam de Búrca (University of Copenhagen)27/05/2026, 12:03Poster
I present a new spectral decomposition software and framework designed for user-friendly modelling of low-to-intermediate redshift quasar spectra. The Python-based framework is specifically designed for use in the 4MOST AGN survey (S6) to serve as an initial quick and robust spectral modelling tool. The framework is founded on statistically-motivated simplifications, such as fitting different...
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Tuomas Kangas (Finnish Centre for Astronomy with ESO, University of Turku)27/05/2026, 12:04Poster
Superluminous supernovae (SLSNe) are extraordinary stellar explosions that dwarf normal supernovae (SNe). Their extreme luminosity and (in most cases) longevity requires an energy budget that far exceeds that of normal SNe and power sources. So-called SLSNe II are H-rich, broad-lined events that show signs of interaction with their circumstellar medium (CSM) despite the lack of strong narrow...
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Christina Humina (University of Turku)27/05/2026, 12:05Poster
Type Ic supernovae (SNe) are explosive deaths of massive stars that have lost their
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hydrogen and helium layers before explosion. In almost all cases this H-rich material is not found near SNe Ic, presumably swept away by the progenitor's strong stellar winds. SN 2017dio is a type Ic SN interacting with hydrogen-rich circumstellar material (CSM), challenging the models of massive-star... -
Buyanbileg Amarsanaa (University of Southern Denmark / SDU-Galaxy)27/05/2026, 12:06Poster
This exploratory study investigates the optimisation of Earth-departure inclination angle for low-energy Earth-Moon transfer in the context of Danish-led Máni mission which is in the ongoing process of Phase A/B1. Using ESA MIDAS-SALTO, the ballistic Earth-Moon flyby leg under the three body dynamics of Sun, Earth and Moon in the ICRF. Initial states are generated via SALTO Lunar-Lambert guess...
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Smaragda Vidali27/05/2026, 12:07Poster
Evidence of the CNO cycle can be observed in the atmospheres of K and M giant stars through their surface carbon isotope ratios. For the isotopes standard stellar evolution models predict a decrease in the C12/ C13 ratio to drop from values of about 70 to roughly 20 after first dredge-up. However, observations reveal ratios as low as 5, close to the CNO-cycle equilibrium value, providing...
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Gustav Olander27/05/2026, 12:08Poster
Luminous and ultra-luminous infrared galaxies (LIRGs and ULIRGs) play a crucial role in our understanding of galaxy evolution, as they represent phases of intense star formation and rapid supermassive black hole (SMBH) growth. A subset with 21 (38) per cent of the nearby (U)LIRGs shown to contain a highly obscured central galactic engine, a Compact Obscured Nuclei (CON), representing a crucial...
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Anne Virkki (University of Helsinki)27/05/2026, 13:15Oral
In light of the renewed interest in landed missions to the Moon, here we empirically evaluate the effect of meter-scale rock-related roughness on radar backscatter by combining monostatic S-band (13 cm) radar measurements by the Lunar Reconnaissance Orbiter's (LRO) Miniature Radio Frequency (Mini-RF) instrument with Diviner-derived meter-scale rock abundance (RA) [1] over the lunar surface,...
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Manuel Linares27/05/2026, 13:15
In 2021, I established a new ERC-funded research group on neutron star astrophysics in Trondheim, Norway. Our main focus has been on compact binary millisecond pulsars: a growing class of Galactic neutron stars nicknamed "spiders". Only one spider pulsar was known in 1990 when the Uppsala Nordic-Baltic conference took place (the original "black widow") and only four were known in 2008 when...
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Mika Juvela27/05/2026, 13:15Oral
Stars form mainly in filamentary molecular clouds. This makes it important to determine, how these cloud filaments form, accrete matter, and fragment into pre-stellar cores. Accretion will continue even in later stages, associated with the protostars that are born in the cores. During the star formation, also the properties of the interstellar gas and dust evolve. This affects the cloud...
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Helena Faustino Vieira (Stockholm University)27/05/2026, 13:30Oral
The star formation process is at the center of the baryonic cycle, dictating galaxy evolution and setting the stage for planet formation. Feedback from massive stars injects momentum, energy and metals into the natal cloud, kickstarting the emergence process of young star clusters. JWST can pierce through the dusty interstellar medium and reveal the feedback-driving emerging young star...
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Karri Muinonen (University of Helsinki, Department of Physics)27/05/2026, 13:30Oral
A theoretical fractional-Brownian-motion particulate-medium scattering model (fBm-PM; see Björn et al., PSJ 5, 260, 2024) is used to interpret space-based and ground-based observations of Mercury regolith in the ultraviolet--visible--near-infrared spectral range of photometric and polarimetric observations. The fBm-PM model is based on radiative transfer and coherent backscattering (RT-CB) and...
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Karri Koljonen (Norwegian University of Science and Technology)27/05/2026, 13:30
Compact binary millisecond pulsars, commonly known as "spiders", are fast‑spinning neutron stars locked in tight orbits that gradually strip their low‑mass companions. These extreme systems are powerful probes of pulsar evolution and key to measuring the most massive neutron stars, providing vital constraints on the physics of ultra‑dense matter. The surge in discoveries since the launch of...
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Ari Leppälä (University of Helsinki)27/05/2026, 13:45Oral
Airless Solar System objects’ photometric phase curves exhibit a distinctive opposition effect, marked by nonlinear brightening as phase angles approach the backscattering direction. In addition to phase angles below approximately 20 degrees, polarimetric phase curves predominantly show a negative degree of linear polarization, with scattered light polarized parallel to the Sun-object-observer...
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Alex Pedrini (Stockholm University)27/05/2026, 13:45Oral
The interplay between massive stars and the interstellar medium (ISM) during the embedded phase of star formation is a key driver of the physical, chemical, and morphological evolution of galaxies. As young star clusters emerge from dense, dusty gas clouds due to feedback from their massive stars, they inject large amounts of energy and momentum into their surroundings, shaping the local ISM...
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Jordan Simpson (NTNU)27/05/2026, 13:45
Compact binary millisecond pulsars, or 'spiders', consist of rapidly-spinning neutron stars spun up by a sustained accretion phase. As such, they are predicted to harbour the most massive neutron stars. These super-massive compact objects are paramount to finding the maximum neutron star mass, which has profound ramifications across many fields, such as gravitational wave astronomy, nuclear...
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Anastasiia Plotnikova (Lund University)27/05/2026, 14:00Oral
How old is the Universe? What happened to the Milky Way at the very beginning of its formation? To answer these questions, we analyze a sample of 28 extremely metal-poor field stars in the solar vicinity. We determine their ages and kinematical properties, and combine these together with their chemical composition to study their origin. The mean age of the sample is 13.8 ± 0.5 Gyr, suggesting...
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Meri Kolehmainen (University of Helsinki)27/05/2026, 14:00Oral
The irregular particulate surfaces of asteroids lead to complex light-scattering processes affected by multiple surface properties, such as particle size, shape, refractive index, and spatial distribution. When modelling the scattering processes, the single scatterers can be described with the scattering matrix, a 4x4 Mueller matrix [1]. However, inverse modelling of the surface properties...
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Joonas Nättilä (University of Helsinki)27/05/2026, 14:00
Radiative plasma processes in neutron-star magnetospheres play a central role in shaping radio pulsar emission and high-energy variability. In particular, magnetospheric gaps—regions of unscreened electric field near pulsar polar caps—provide natural sites for extreme particle acceleration, radiation, and electron–positron pair creation. These gaps are believed to be key to triggering pair...
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Mikko Vuori (University of Helsinki)27/05/2026, 14:15Oral
Sunlight that is scattered by a planetary surface is altered, meaning that asteroid regolith surfaces can be studied via light scattering.
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The regolith surface properties that contribute to light scattering are its material, particle shape, particle size, and size distribution. As an inverse problem, the same properties can be derived for the surface from scattered light. If one of the... -
Shilpa Bijavara Seshashayana (Malmö University)27/05/2026, 14:15Oral
Open clusters provide robust constraints on Galactic chemical evolution because their member stars have well defined ages, Galactic birth radii, and a shared chemical baseline. This homogeneity enables high precision constraints by averaging abundances across multiple stars within the same cluster, reducing the impact of star to star scatter and measurement uncertainties. However, the...
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Ville-Vertti Linho (University of Helsinki)27/05/2026, 14:15
Radio-wave emissions originating from pulsar plasmas have been investigated for
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decades. Still, there exists a mismatch between the observations and theory. On top of the
polar gap of a neutron star, a plasma cloud is created due to the pair-production process.
Due to the short synchrotron radiation time, only parallel currents, with respect to the
background magnetic field, are present in... -
Luis Suelves (Tartu Observatory, University of Tartu)27/05/2026, 15:00Oral
Unsupervised Machine Learning can create classifications by learning from data features and has the capacity to process the vast number of galaxies observed by contemporary large sky telescopes. We designed an Unsupervised ML technique that performs a dimensionality reduction with UMAP and then applies clustering methods such as GMM and HDBSCAN to the resulting 2D embedding. It was implemented...
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Indrek Vurm (University of Tartu)27/05/2026, 15:00Oral
Periodic collisions between a star on an inclined orbit around a supermassive black hole and its accretion disk offers a promising explanation for the recently discovered X-ray quasi-periodic eruptions (QPEs) from galactic nuclei. Each passage through the disk midplane shocks and compresses gas ahead of the star, which subsequently re-expands above the disk as a quasi-spherical cloud. We...
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Emelie Sandved (Uppsala University, Department of Physics and Astronomy, Division of Astronomy and Space Physics)27/05/2026, 15:00Oral
Knowing ages of stars is essential for many fields in astronomy where we want to study the evolution of different astronomical systems. Examples of such fields are planet system evolution, planetary evolution, and galactic archaeology. However, estimating the age of a star is not as straightforward as one might think. In fact, stars undergo very few evolutionary stages where their observed...
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Lia Doubrawa (Universiy of Helsinki)27/05/2026, 15:15Oral
Galaxy clusters and groups are powerful tools for investigating the properties of the Universe. However, the identification of low-redshift X-ray groups remains challenging, requiring deep optical catalogs with reliable redshift estimates over large sky areas. In this work, we aim to detect and characterize galaxy groups through their outskirts by applying an optimized technique that enables...
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Uliana Pylypenko (Finnish Centre for Astronomy with ESO (FINCA); University of Turku)27/05/2026, 15:15Oral
Microlensing provides a unique way to detect and constrain the masses of isolated, non-luminous objects, including dark stellar remnants. Under favorable conditions, lens masses can be measured using photometric data alone, typically through the detection of finite-source (FS) effects in highly magnified events.
I will present unusual microlensing events identified in Gaia Alerts and Gaia...
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Mauri Valtonen (University of Turku)27/05/2026, 15:15Oral
Supermassive binary black holes in galactic nuclei evolve in three stages: (1) The binary contracts by ejecting stars from its neighbourhood by the slingshot process, (2) The binary loses angular momentum via slingshot ejections and becomes very eccentric, and (3) The binary enters the strong gravitational wave regime and quickly contracts and becomes circularized again. Aarseth (2006)...
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Sicheng Yu27/05/2026, 15:30Oral
The population of known white dwarfs (WDs) has expanded rapidly with Gaia observations, the number of WDs and their candidates have exceeded beyond one million. High-resolution surveys like the ESO SN Ia Progenitor Survey (SPY) provided gold-standard parameters for ~1,000 WDs using UVES/VLT spectra. However, precious observations with such precision and high resolution are not meant for the...
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Jenni Häkkinen (University of Helsinki)27/05/2026, 15:30Oral
The existence of cuspy or cored centers of dark matter halos is a crucial discriminant between different dark matter models. It has recently been claimed that perfectly cored stellar systems cannot survive inside cuspy dark matter halos, which would make the observation of stellar cores in ultra-faint dwarf galaxies, where dark matter cores cannot form through baryonic processes, a direct...
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Gregory Walsh (Niels Bohr Institute)27/05/2026, 15:30Oral
Changing-look Active Galactic Nuclei (CLAGN) have dramatically altered our understanding of the astrophysical processes governing supermassive black hole accretion. Determining the phenomena that drive accretion state transitions in CLAGN, e.g., Seyfert Type I to Type II or vice versa, remains an open question in contemporary studies. An important factor to consider in theoretical models...
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Paula Kvist (University of Oulu)27/05/2026, 15:45Oral
Cataclysmic variables (CVs) are a type of interacting binary stars with a white dwarf primary and a low-mass donor star. In weakly magnetic systems, an accretion disk is formed around the primary star. Current evolutionary models predict the orbital period of CVs to shorten, until the donor has lost enough mass to become a degenerate brown dwarf. This happens at orbital periods of around...
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Teet Kuutma (Tartu Observatory of the University of Tartu)27/05/2026, 15:45Oral
The position of the Earth in the Milky Way galaxy allows detailed study of stellar and gas processes inside the Galaxy. On the other hand, Earth's position inside the Milky Way disk inhibits vision of the entirety of the Galaxy, complicating studies of the Galaxy in its entirety. One solution is to study stellar populations of other galaxies with similar properties to the Milky Way. These...
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Vito Tuhtan (Copenhagen University, DARK research center)27/05/2026, 15:45Oral
Although active galactic nuclei (AGN) have been studied extensively for more than six decades, the physical origin of their powerful luminosities and the structure and geometry of their central regions remain a mystery. The aim of this study is to interpret UV and optical spectroscopic observations by combining reverberation mapping with photoionization modeling. Reverberation mapping has been...
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Azlizan Adhyaqsa Soemitro (Leibniz-Intitut für Astrophysik Potsdam (AIP))27/05/2026, 16:00Oral
Planetary nebulae (PNe) are post-AGB shells around stars from main sequence progenitors of 1- 8 solar masses. PNe typically emit a strong emission line of [OIII]5007, making them observable in distant galaxies. Narrow band [OIII]5007 photometry of galaxies has been used to identify the PN candidates within and construct the corresponding planetary nebula luminosity function (PNLF). With the...
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Ms Roberta Vieliute (University of St Andrews)27/05/2026, 16:00Oral
The intricate structure of the most luminous objects in the universe - Active Galactic Nuclei (AGN) - cannot be spatially resolved with current telescopes. Instead, we can probe the inner regions of AGN indirectly by exploiting their highly variable, multi-wavelength nature through the powerful technique of Reverberation Mapping (RM). Ionizing photons in the vicinity of the central black hole...
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Veera Vuolteenaho (University of Oulu)27/05/2026, 16:00Oral
We present a detailed study of V627 Pegasi, a short-period dwarf nova of the WZ Sge-type exhibiting some peculiar behavior. Our analysis is based on multi-epoch time-resolved spectroscopy complemented by photometric observations. The dataset includes observations from the Hubble Space Telescope, the Very Large Telescope of the European Southern Observatory, and the Nordic Optical Telescope....
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Jenni Jormanainen (University of Turku)27/05/2026, 16:45Oral
Blazars and radio galaxies are famously known to be variable sources across the entire electromagnetic spectrum due to the rather close alignment of their jet with our line of sight and relativistic jet speeds. In the very high-energy (E > 100 GeV) gamma rays, the fastest flares reach hour-to-minute timescales that cannot be explained by the typical shock acceleration scenario. Magnetic...
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Mikko Tuomi (University of Helsinki)27/05/2026, 16:45Oral
Obtaining detailed information on the active regions, i.e. spots, on stellar surfaces based on photometry is challenging. This is because retrieving two-dimensional information based on one-dimensional time-series data corresponds to an ill-posed inverse problem.
However, there are ways around the ill-posedness and it is possible to study stellar spot configurations in detail in a variety...
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Tuomo Salmi (University of Helsinki)27/05/2026, 16:45
Coherent radio emission is observed from a variety of compact astrophysical objects with relatively weak magnetic fields, including white dwarfs, millisecond pulsars, and possibly long-period radio transients and black hole magnetospheres. In such environments, the standard pair discharge mechanism—driven by synchrotron radiation and one-photon pair production—fails because the low magnetic...
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Hans Kjeldsen (Instrument Centre for Danish Astrophysics, Aarhus University, Denmark)27/05/2026, 17:00Oral
Asteroseismology is the study of oscillations in stars. Stars can sustain standing waves, meaning that the star is oscillating. These oscillations can be excited by different mechanisms. The opacity mechanism, acting in ionization zones, converts thermal energy into mechanical oscillations, whereas solar-like oscillations are stochastically excited and damped by turbulent convection in the...
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Mikael Turkki (FINCA, University of Turku)27/05/2026, 17:00Oral
Magnetic fields are known to be involved in the launching of relativistic jets from supermassive black holes. While there is lack of knowledge on the precise jet launching mechanisms, both observations and simulations have recently provided us new information on the expected magnetic field structure at the jet launching region. Our work focuses on the polarization observations in the...
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Mr Olavi Kiuru (University of Helsinki)27/05/2026, 17:00
In the magnetospheres of magnetars, strongly magnetized neutron stars, the magnetic field can be tens of times the critical Schwinger field $B_Q = m^2/e \approx 4.41\cdot 10^{13}$ G. In this strong field regime quantum electrodynamics (QED) becomes nonlinear, which has profound effects on the plasma dynamics of the magnetosphere. Most notably the energies of electrons and positrons become...
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Joonas Suortti (Aalto University)27/05/2026, 17:15Oral
The acceleration of relativistic jets launched by active galactic nuclei (AGN) is expected to be driven by magnetic fields. However, the exact acceleration mechanism is still uncertain, with several magnetic jet acceleration models having been proposed. In order to potentially constrain such models, measuring the magnetic field strength near the base of AGN jets is essential. With...
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Vadzim Krautsou (University of Turku)27/05/2026, 17:15
In this talk, I’ll present the results of a comprehensive, 3-year-long multiwavelength polarimetric campaign on the prototypical black hole X-ray binary Cygnus X-1, conducted between 2022 and 2024. Using data from the Imaging X-ray Polarimetry Explorer (IXPE), we measured X-ray polarization 13 times across both hard and soft spectral states. We found that the polarization degree in the hard...
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Prof. Oleg Kochukhov (Uppsala University)27/05/2026, 17:15Oral
The surface magnetic fields of cool stars are inherently multi-scale, dominated by small-scale structures while also hosting weaker large-scale components. Historically, these two aspects of stellar magnetism have been studied in isolation, using distinct diagnostic techniques—Zeeman broadening for small-scale fields and spectropolarimetry for large-scale fields. This separation has led to a...
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Jérôme Bétrisey (Uppsala University)27/05/2026, 17:30Oral
Following the success of missions like CoRoT, Kepler, and TESS, asteroseismic modelling is poised to play a key role in upcoming space-based missions such as PLATO, CubeSpec, and Roman. Despite remarkable achievements, the era of high-precision asteroseismology has also revealed significant discrepancies between observed data and theoretical stellar models, leading to non-negligible biases...
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303. Resolving a nuclear disk and molecular outflows in the compact obscured nucleus IRAS 17578-0400Olena Torbaniuk (Space, Earth and Environment Department, Chalmers University of Technology, Gothenburg, Sweden)27/05/2026, 17:30Oral
Compact obscured nuclei (CONs) represent one of the most extreme and least understood phases of nuclear activity in nearby luminous infrared galaxies. Powered by either deeply buried active galactic nuclei or extremely compact starbursts, these systems provide a unique laboratory for studying the simultaneous onset of nuclear fueling and feedback during rapid galaxy evolution. Their high...
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Anna Bobrikova (University of Turku)27/05/2026, 17:30
Weakly magnetized neutron stars are among the brightest objects in the X-ray sky. Unlike pulsars, in these systems, magnetic field is not strong enough to affect the accretion flow, so the accreted matter falls directly onto the neutron star surface. The exact geometry of the accretion flow in these systems is still unknown, and until recently, we did not have an appropriate tool to study this...
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Milda Valytė27/05/2026, 17:45Oral
AGN-driven galactic outflows are a central ingredient of galaxy evolution models, yet quantitative comparisons between simulations and observations remain challenging because key observables - most notably the mass outflow rate - are not uniquely defined. In this project, we investigate how inferred relationships between outflow properties and host-galaxy/AGN characteristics depend on the...
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Alexander Salganik (University of Turku)27/05/2026, 17:45
We report the first detection of X-ray polarization with the Imaging X-ray Polarimetry Explorer (IXPE) from the X-ray pulsar (XRP) 4U 1954+319. The source belongs to an extremely rare class of systems in which a slowly rotating neutron star accretes from the dense wind of a red supergiant companion. Coherent pulsations are detected at $P_{\rm spin}=5.49\pm0.05$ h, which is one of the longest...
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Irene Amateis (Uppsala University)27/05/2026, 17:45Oral
M dwarfs are the most common stars in the Galaxy and prime targets in the search for potentially habitable exoplanets. Their strong magnetic fields shape stellar atmospheres, drive winds, and critically influence the environments of orbiting planets. A reliable characterisation of these fields is therefore essential for both stellar astrophysics and planetary habitability studies.
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We... -
Sofia Forsblom (University of Turku)27/05/2026, 18:00
Observations of accreting X-ray pulsars (XRPs) carried out by the Imaging X-ray Polarimetry Explorer (IXPE) have provided completely new insight into these fascinating objects, thanks to the indispensable information embedded in their linear X-ray polarization. X-ray polarimetry enables us to measure the polarization angle (PA) and degree (PD) as a function of pulse phase for XRPs, which...
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Mrs Maria Stone (University of Turku)27/05/2026, 18:00Oral
For low-redshift quasars, growing observational evidence supports secular processes and minor mergers as the dominant mechanisms for nuclear triggering. We present results from a recently accepted paper based on the GAMA spectroscopic survey, in which we investigate the star formation histories of quasar host galaxies using SED fitting. We also present preliminary results from a companion...
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Andras Haris (University of Helsinki)27/05/2026, 18:00Oral
Eclipsing binaries with a spotted giant component are exceptional laboratories for the study of stellar magnetism. Although magnetic activity in such systems has long been recognised, detailed photometric analyses were historically limited by incomplete ground based data. High precision space photometry now enables eclipse mapping, a technique which allows us to infer starspot properties from...
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Mikael Granvik (University of Helsinki, Luleå University of Technology)27/05/2026, 18:30
Asteroidit ja komeetat sisältävät valtaosan siitä informaatiosta, jota meidän on mahdollista saada Aurinkokunnan synnystä noin 4,57 miljardia vuotta sitten sekä sen kehityksestä vuosimiljardien kuluessa aina meidän päiviimme saakka. Miten asteroideja ja komeettoja tutkitaan, ja mitä ne tarkalleen ottaen kertovat Aurinkokunnan historiasta?
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Jarle Brinchmann28/05/2026, 09:00
The European Southern Observatory (ESO) has been a cornerstone of European astronomy for more than five decades and is today the leading ground-based observatory on the planet. It manages the Paranal and La Silla observatories and is the European partner in the ALMA observatory, and in a few years the Extremely Large Telescope (ELT) and Cherenkov Telescope Array Observatory (CTAO) will become...
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Heidi Korhonen28/05/2026, 09:38
ESO operates the world’s leading ground-based optical and
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infrared observatories. The groundbreaking science they deliver relies
on an ambitious suite of instruments developed by ESO and international
consortia. In this talk, I will provide an overview of the current
instrumentation at ESO’s La Silla Paranal Observatory, as well as the
new facilities that will come online in the near... -
Carlos De Breuck (ESO)28/05/2026, 10:45
ALMA has been a tremendous success, opening up sub/mm science to a wide range of science topics. I will give an overview of the current ALMA system and the planned Wideband Sensitivity Upgrade, which will quadruple the instantaneous spectral bandwidth and increase the sensitivity. Although the demand for ALMA time is high, I will try to give some hints on how to be successful in applying for...
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Prof. Michele Doro (University of Padova)28/05/2026, 11:23
The Cherenkov Telescope Array Observatory (CTAO) will be the next-generation facility for very-high-energy gamma-ray astronomy, covering the energy range from ~20 GeV to 300 TeV and improving sensitivity by at least an order of magnitude over current instruments. It will be the first gamma-ray open, proposal-driven observatory. With observation stations in La Palma (North) and near ESO Paranal...
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Alexander Mustill (Lund University)28/05/2026, 12:00Poster
When stars evolve, their expanding radii should destroy all planets, asteroids and comets within a few astronomical units. However, many white dwarfs show evidence of planetary material on very short-period (<~1 day) orbits, or deposited into the stellar atmosphere, giving insight into the end states of planetary systems like our own. I will present an overview of our understanding of such...
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Jess Kocher (Malmö University)28/05/2026, 12:01Poster
The origin of multiple populations in globular clusters is very much an open question today. In part, this is an issue of observational data: Small studies vary strongly in method, making it difficult to compare their results, while large-scale spectroscopic survey pipelines are unreliable for chemically peculiar stars. Thus, there is simply not enough reliable data to check theories against....
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Karlis Pukitis (University of Latvia)28/05/2026, 12:02Poster
Virtually nothing is known about the stellar wind in post-AGB phase despite it contributing to evolutionary rate of the star and formation of the subsequent planetary nebula. Near-infrared region of post-AGB star spectra remains unexplored in high-resolution. Of particular interest are CO molecular lines that probe outer atmospheric layers where outflows are expected to form. I will present...
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Heleri Ramler (University of Tartu)28/05/2026, 12:03Poster
Accurate stellar parameters are essential for interpreting exoplanetary systems and, in particular, for exploiting the atmospheric survey that will be carried out by ESA’s Ariel mission. Ariel will observe the atmospheres of roughly one thousand exoplanets using a tiered survey strategy, and requires a precise and homogeneous characterisation of host stars across a broad parameter range before...
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Šarūnas Mikolaitis (Vilnius University)28/05/2026, 12:04Poster
In this contribution, we present a project specifically dedicated to conducting a comprehensive, homogeneous, and precise analysis of the abundances of carbon, nitrogen, and oxygen (CNO) in a large set of stars belonging to all main Galactic stellar populations. We are using the results to investigate the chemical enrichment history of these elements and explore the effects of evolutionary...
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Vladas Šatas (Vilnius University)28/05/2026, 12:05Poster
We present results from an ongoing high-resolution spectroscopic survey of hot subdwarf stars observed with the Vilnius University Echelle Spectrograph (VUES) mounted on the 1.65 m telescope at Molėtai Astronomical Observatory in Lithuania. Building on our previous large-scale study of ~20,000 Gaia XP spectra, we use medium-high-resolution (R≈36,000) optical spectra to derive atmospheric...
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Veronika Mitrokhina (Tartu Observatory of the University of Tartu)28/05/2026, 12:06Poster
Deuterium (D) was primarily produced during Big Bang Nucleosynthesis, with a primordial abundance of [D/H] = (2.58 ± 0.13) × 10⁻⁵ (Cyburt et al. 2016). Deuterium is easily destroyed in stellar interiors through nuclear fusion making its detection in stellar atmospheres unlikely unless external processes, such as planetary engulfment, temporarily enhance surface abundances. A-type stars, with...
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Roar Holmberg (Nordic Optical Telescope and Aarhus University)28/05/2026, 12:07Poster
In the field of asteroseismology, solar-like oscillations are mostly observed using either photometry or radial velocity (RV) from high-resolution stellar spectra. A third option is to measure variations in flux in stellar absorption lines in the spectrum that are sensitive to changes in temperature at the surface of the star.
The first detection of solar-like oscillations in any star other...
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Carlos Viscasillas Vázquez (Vilnius University)28/05/2026, 12:08Poster
Stellar ages remain one of the most difficult parameters to determine in astrophysics. Chemical clocks based on s-process–to–α element abundance ratios offer a promising alternative, but require a robust calibration. We derived asteroseismic ages for 218 F–K giant stars observed in and around the TESS Northern Continuous Viewing Zone using the PARAM and BASTA codes. High-resolution spectra...
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Hua Xiao (University of Turku)28/05/2026, 12:09Poster
We present timing and spectral analysis of XMM-Newton observations of the Be/X-ray pulsar 4U 0115+63 following its 2023 giant outburst. In the quiescent state, we detect coherent X-ray pulsations with a high pulsed fraction (>50%) but no significant low-frequency red noise, indicating the absence of active accretion. The spectrum is well described by a single blackbody with a small emitting...
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Tuomas Hämäläinen (FINCA & University of Turku)28/05/2026, 13:15Oral
VCC 1249 is dwarf irregular galaxy located within the halo of Messier 49 (M49), the brightest galaxy in the Virgo galaxy cluster. The gravitational interaction between the two galaxies leads to accretion of matter, including globular clusters, from VCC 1249 into the intracluster light of the Virgo cluster and the halo of M49. Understanding galactic interactions like these can improve our...
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Anni Kasikov (University of Tartu)28/05/2026, 13:15Oral
Yellow Supergiants (YSGs) and Yellow Hypergaints (YHGs) represent brief and unstable phases in the lives of massive stars. They provide a link between the Red Supergiant and evolved Blue Supergiant stages, but their evolutionary pathways remain poorly constrained. Some luminous yellow stars have also been identified as Supernova progenitors. Accurate stellar parameters for YSGs and YHGs in the...
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Antoine Kouchner (Centre National de la Recherche Scientifique (FR))28/05/2026, 13:15Oral
The Astroparticle Physics European Consortium (APPEC) is an international organisation bringing together the European scientific community active in astroparticle physics. Its mission is to promote and coordinate research in this field by fostering transnational collaboration, developing common strategies, and supporting the construction and operation of large-scale research infrastructures....
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Pouya Kouch (University of Turku)28/05/2026, 13:30Oral
Since two decades ago the IceCube Neutrino Observatory has been detecting ~TeV-PeV neutrinos from mostly unidentified extraterrestrial sources. So far, active galactic nuclei (AGN), powered by supermassive black holes (SMBH), are theoretically and observationally the most likely source candidates. The hottest spot in the diffuse ~TeV neutrino sky is a weakly jetted Seyfert-II AGN, while the...
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Giacomo Bortolini (Stockholm University)28/05/2026, 13:30Oral
I will present new JWST/NIRCam observations of the interacting dwarf galaxies NGC 4485/NGC 4490 (a.k.a. Arp 269), obtained as part of the Cycle 1 Feedback in Emerging extrAgalactic Star clusTers (FEAST) program. NGC 4485 and NGC 4490 form the closest known pair of interacting late-type dwarf galaxies (at ~8 Mpc), excluding the Magellanic Clouds. This system offers a unique opportunity to study...
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Vitalii Checha (Tartu Observatory)28/05/2026, 13:30Oral
The post-main-sequence evolution of massive stars remains a challenging area of study, with many aspects still poorly understood. By investigating the pulsational behavior of evolved massive blue supergiants (BSGs), which hold place in instability region at the top of the HR diagram, we can
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gain insights into their internal structure and verify existing evolutionary models. We combine various... -
Havva Bostan (University of Tartu)28/05/2026, 13:45Oral
Symbiotic stars (SySts) are interacting binary systems composed of a cold, dust-producing red giant, losing material to a hot white dwarf (WD), and embedded in a surrounding nebula as a result. Interactions between the stellar components, such as mass transfer via Bondi–Hoyle–Lyttleton accretion or Roche-lobe overflow, can trigger outbursts, jet formation, and nova-like explosions. Such events...
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Folkert Wierda (Turku University)28/05/2026, 13:45Oral
Blazars, a subclass of active galactic nuclei with relativistic jets aligned close to the line of sight, exhibit strong, rapidly variable emission across the electromagnetic spectrum due to Doppler boosting. Their double-peaked spectral energy distributions (SEDs) are attributed to synchrotron emission at lower frequencies and inverse Compton scattering at higher frequencies, providing key...
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Kirsty Butler (Chalmers University of Technology)28/05/2026, 13:45Oral
Galaxies do not form in isolation, but rather evolve symbiotically with the wider cosmic web. At the interface between a galaxy's Interstellar Medium (ISM) and the Inter-Galactic Medium (IGM) is the Circum-Galactic Medium (CGM) in which all matter flowing in from the IGM or out of the galaxy must travel. This halo of gas is therefore sensitive to both the evolutionary processes occurring...
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María Benito Castaño28/05/2026, 14:00Oral
In this talk, we will assess what can drive a chemical bimodality in the [α/Fe]-[Fe/H] plane of disc stars in a simulated Milky Way-mass galaxy which has had no major mergers and negligible radial migration. We will first identify disc components via Gaussian Mixture Modeling and then interpret them based on chemical evolutionary tracks, gas flows across the disc and their interaction with the...
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Irene Varglund28/05/2026, 14:00Oral
From sources with presumably no significant radio emission to sources capable of forming and maintaining relativistic jets, narrow-line Seyfert 1 galaxies (NLS1s) have challenged paradigms. These sources are identified by their distinct spectral line features: the full width at half maximum being a maximum of 2000 km/s for the broad Hb component and S[O III]/S(Hb) < 3. However, due to the...
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Markus Ambrosch (Vilnius University)28/05/2026, 14:00Oral
Hot subdwarfs are compact, core helium-burning stars located on or near the extreme horizontal branch, with temperatures of 20,000–50,000 K and very thin hydrogen envelopes. They are widely regarded as products of binary interaction and are important contributors to the ultraviolet emission of old stellar populations. In this talk, we present our classification of 20,061 hot subdwarfs into...
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Suman Sahu (University of Turku)28/05/2026, 14:15Oral
(Ultra-) Luminous Infrared Galaxies ((U)LIRGs) host some of the most intense star formation in the local universe and serve as nearby analogues of high-redshift starbursts. High–resolution near-infrared adaptive optics imaging of nearby (U)LIRGs reveals two key results: a substantial fraction of core-collapse supernovae (CCSNe- the death of massive stars) occur in faint, apparently isolated...
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Joachim Wiegert (Uppsala university)28/05/2026, 14:15Oral
The asymptotic giant branch (AGB) is a late evolutionary stage of stars with masses between 0.8-8 solar masses. AGB stars have grown to radii of around 300 times their original sizes, have non-spherically symmetric surfaces, immense convection zones, and strong dust-driven winds that are initiated when dense dust clouds form in regions close to the stellar surface. These winds are important...
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Scott Hagen (IFPU / SISSA / INAF-OATs)28/05/2026, 14:15Oral
Active galactic nuclei (AGN) are powered by accretion onto a supermassive black hole (SMBH), but the structure of this flow is not well understood. Standard accretion disc models match to zeroth order in predicting substantial energy dissipated in optically-thick material, producing a strong blue/UV continuum. More detailed comparisons to the observed spectral shapes fail, along with a...
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Hanna Pentikäinen (University of Helsinki)28/05/2026, 15:00Oral
Asteroids exhibit special features in the way they scatter unpolarised incident sunlight: the nonlinear increase in brightness at small phase angles (the angle between the Sun and the observer seen from the object, α) and the negative degree of linear polarisation at α < 30°. Furthermore, there is a linear dependence of brightness on the phase angle in the magnitude scale at α > 10° due to...
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Pablo Araya Araya (Cosmic Dawn Center)28/05/2026, 15:00Oral
High-redshift ($z \gtrsim 2$) massive quiescent (MQ) galaxies offer a unique window into the physical processes that fuel and quench star formation in the early Universe. Observational evidence suggests a potential evolutionary link between MQs and dusty star-forming galaxies (DSFGs), another extreme population at high redshift. However, galaxy formation models have historically struggled to...
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Georgios Filippos Paraschos (Finnish Centre for Astronomy with ESO)28/05/2026, 15:00Oral
Jets launched by accreting supermassive black holes (SMBHs) are key to understanding how energy is extracted from compact objects and fed into their environments. How these jets form and where high-energy $\gamma$-rays are produced, in the so-called blazar zone, remain open questions. Competing scenarios place the $\gamma$-ray emission either close to the SMBH, within the broad-line region, or...
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Britton Jeter (Finnish Centre for Astronomy with ESO)28/05/2026, 15:15Oral
Relativistic Jets from AGN are prime sources for cosmic neutrinos and other high energy particles, and likely act as a main force to regulate star formation and evolution in their host galaxies. The precise details of the jet launching mechanism, particle content, and energetics of the emitting electrons are still poorly understood. These questions can be tackled by investigating the...
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Miranda Kiran Husted Andersen (The Thecnical University of Denmark)28/05/2026, 15:15Oral
To understand the galaxies of today, we must understand the galaxies of the past. The cosmic star formation activity peaked around z~2, a time known as the cosmic noon. At this time galaxies look quite different than today. More than 50% of the star formation activities were obscured by dust and reemitted in far-infrared/submillimetre. Galaxies dominated by submillimetre emission (> 1 mJy at...
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Antti Penttilä (University of Helsinki)28/05/2026, 15:15Oral
Camera systems and their operations need to be planned and tested beforehand in space missions. Furthermore, pipelines producing data products from instruments need to be in place and operating when actual observations start. With this in mind, we are developing a suite of tools for imaging simulation tools for small solar system objects. The immediate use cases are the ESA Hera and Comet...
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Elo Tuominen (University of Helsinki)28/05/2026, 15:30Oral
The orbital changes during a close encounter between a perturber asteroid and a test asteroid can be analyzed to estimate the mass of the perturber. The changes are constrained with astrometric observations, making precise astrometry vital for asteroid-mass estimation. Currently, the best astrometry for the purpose of mass estimation comes from ESA’s Gaia mission, which provides astrometry of...
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Till Sawala (University of Helsinki)28/05/2026, 15:30Oral
The evolution of galaxies in their mutual gravitational potentials is a recurrent problem in extragalactic astrophysics. It is commonly modeled under several simplifying assumptions, which break down when more than one galaxy is extended and massive, when galaxies are overlapping, or when the interaction involves more than two objects. I will review the usual methods for orbital integration,...
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Emma Johtela (University of Turku)28/05/2026, 15:30Oral
Blazars, which are active galactic nuclei with relativistic jets pointing towards us, are among the most energetic phenomena in the universe. The radiation observed from blazars covers the entire electromagnetic spectrum, sometimes all the way up to the very-high-energy (VHE) gamma-rays, with energies over 100 GeV. Their VHE gamma-ray flux can vary by orders of magnitude on timescales as...
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Matas Tartėnas (Center for Physical Sciences and Technology)28/05/2026, 15:45Oral
It has long been known that supermassive black hole (SMBH) mass correlates with host galaxy properties; the most fundamental of these is the M-sigma relation between SMBH mass and bulge velocity dispersion. In the framework of active galactic nucleus (AGN) wind-driven feedback, AGN luminosity is communicated to the surrounding gas via a quasi-relativistic wind emanating from the accretion...
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Fatemeh Abedini28/05/2026, 15:45Oral
The COSMOS-Web survey, with its unparalleled combination of multiband data, notably, near-infrared imaging from \textit{JWST}'s NIRCam (F115W, F150W, F277W, and F444W), provides a transformative dataset down to $\sim28$ mag (F444W) for studying galaxy evolution. In this work, we employ Self-Organizing Maps (SOMs), an unsupervised machine learning method, to estimate key physical parameters of...
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Zuri Gray (University of Helsinki)28/05/2026, 15:45Oral
We present the first polarimetric observations of the third discovered interstellar object (ISO), 3I/ATLAS (C/2025 N1, or 3I), obtained pre- and post-perihelion with FORS2 at the Very Large Telescope, ALFOSC at the Nordic Optical Telescope, and FoReRo2 at the 2 m Ritchey-Chrétien-Coudé telescope, over a phase angle range of 7.7–22.4°. This marks the second-ever polarimetric study of an ISO,...
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Rosemary Dorsey (University of Helsinki)28/05/2026, 16:00Oral
The Legacy Survey of Space and Time (LSST) is expected to begin survey operations in 2026, and the resulting dataset will revolutionise our understanding of the Solar System. Its large on-sky footprint, fast cadence and deep limiting magnitude will probe small body populations to smaller sizes and larger distances than current ground based facilities, which will provide a fresh perspective on...
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Peter Johansson (University of Helsinki)28/05/2026, 16:00Oral
Traditional numerical simulations employing gravitational softening are unable to resolve the small-scale dynamics and gravitational wave emission from supermassive black hole binaries. Instead, the parsec-scale dynamics is typically modelled by post-processing the simulations using semi-analytic methods based on orbit-averaged equations. An alternative is to use a hybrid approach, such as the...
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Hossam Khalil (University of Helsinki)28/05/2026, 16:00Oral
X-ray emission from the hot gaseous atmospheres of galaxy groups and clusters is a sensitive tracer of the non-gravitational processes that redistribute the matter within and around dark matter halos. In particular, energetic processes associated with accreting matter onto supermassive black holes, known as active galactic nuclei (AGN) feedback, are currently the favoured scenario for ejecting...
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Anjasha Gangopadhyay (Oskar Klein Centre, Stockholm University, Sweden)28/05/2026, 16:45Oral
We present the photometric analysis of 39 Type Ibn supernovae discovered by the Zwicky Transient Facility (ZTF). While the majority of events exhibit the canonical fast evolution with short rise times of 5-10 days and rapid post-peak decline rates of about 0.1 mag day⁻¹, we identify a significant subset (roughly ten objects) with slower declines and noticeable light-curve undulations,...
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Håvard Skåli (Institute of Theoretical Astrophysics, University of Oslo)28/05/2026, 16:45Oral
Black holes provide unique laboratories for testing gravity in the strong-field regime. The ringdown phase of a merger is particularly valuable, as it encodes the quasi-normal modes (QNMs) of the remnant black hole. In general relativity, these modes depend only on the mass and spin, making them powerful probes of the no-hair theorem. Modified gravity can alter this spectrum, offering...
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Johanna Hartke (University of Turku)28/05/2026, 16:45Oral
Massive galaxies are crucial for understanding how matter is assembled in the Universe as they contain more than half of the stars in today’s Universe and are also the birthplace of many chemical elements. A few billion years after the Big Bang, intense star formation episodes created so-called red nuggets: ultra-compact massive galaxies that grew into the massive early-type galaxies that we...
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Avinash Chaturvedi (Leibniz Institute for Astrophysics)28/05/2026, 17:00Oral
Massive early-type galaxies (ETGs) represent the final stages of galaxy evolution in the hierarchical formation framework. They typically host central supermassive black holes (SMBHs), which co-evolve with their galaxies and provide an excellent opportunity to investigate the linked growth of black holes and ETGs. Using integral-field spectroscopic data (MUSE, SINFONI) and triaxial...
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Mr Ethan van Woerkom (University of Helsinki)28/05/2026, 17:00Oral
Fast Radio Bursts (FRBs) are short, intense bursts of radio waves (100 MHz-10 GHz) lasting between 4 μs - 10 ms. These bursts, with typical luminosities of order 10^41 erg/s, have been detected at cosmological distances up to redshift z=2.1. Their extreme energetics and great brevity lead to unphysically high brightness temperatures (around 10^37 K), which implies a coherent emission...
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Timo Kravtsov (University of Turku)28/05/2026, 17:00Oral
Supernova remnants (SNRs) are the nebulous phase of supernovae before they dissipate and merge into the interstellar medium. Oxygen-rich (O-rich) SNRs are a rare subtype of which only $\sim$20 have been discovered out of thousands of SNRs in the Milky Way and nearby galaxies. They are dominated by strong forbidden emissions of oxygen in visible light and typically complemented with X-rays and...
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Niko Pyykkinen (University of Turku, Nordic Optical Telescope)28/05/2026, 17:15Oral
Mass loss during the late phases in the lives of massive stars is mostly unknown. Progenitors of stripped-envelope supernovae (SN) experience extensive mass-loss episodes, during which they lose part or all of their hydrogen (H) envelope, and sometimes their helium (He) layer. The loss of the H envelope is generally thought to be caused by interaction with a close binary companion. The...
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Alejandra Diaz Teodori28/05/2026, 17:15Oral
Neutron star X-ray binaries exhibit complex phenomena that require multiwavelength polarimetric data to understand. Among them, Scorpius X-1 displays particularly remarkable behaviour across wavelengths. X-ray polarimetry has revealed an intricate geometry of the inner accretion region, while optical photometry has shown a bimodal flux distribution with a 12.5 h lag behind the X-ray state...
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Markus Anetjärvi28/05/2026, 17:15Oral
Recent mass models of massive early-type galaxies (ETGs) have revealed compact, central mass-to-light (M/L) gradients, potentially indicating variations in the stellar populations and/or initial stellar mass function. These gradients may be linked to in-situ and ex-situ stellar components, as supported by the two-phase formation scenario. Such multiple-component systems challenge "classical"...
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Rebecca Nguyen (University of Oslo)28/05/2026, 17:30Oral
Magnetic reconnections play a crucial role in shaping the dynamics of active regions in the solar atmosphere. It is a fundamental physical process where the reconfiguration of the magnetic field converts magnetic energy into kinetic and thermal energy. Magnetic reconnection events occur on different spatial scales, often associated with solar flares
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and coronal mass ejections. At the smallest... -
Claudia Skoglund (Stockholm University)28/05/2026, 17:30Oral
Long-lived Type II supernovae (SNe) represent a rare subset of hydrogen-rich stellar explosions, whose origins remain relatively unconstrained. Their prolonged light curves suggest additional powering beyond the neutrino-driven core-collapse mechanism, which is typically used to describe Type II SNe. I will present an extensive photometric and spectroscopic dataset of two such events from the...
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Mr Max Mattero (University of Helsinki)28/05/2026, 17:30Oral
Observations using the JWST have shown that high-redshift massive quiescent galaxies (MQGs) are both more numerous and form earlier than previously thought. Owing to their high stellar masses and extreme central densities early on in cosmic history (z > 3), they are likely progenitors of the so-called red nugget galaxies at z~2, which in turn are thought to evolve into the cored, massive...
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Mika Kontiainen (Institute of Astronomy, University of Cambridge)28/05/2026, 17:45Oral
Few planetary systems form in isolation. With both internal and external processes sculpting their orbital architectures over time, quantifying the extent of dynamical processing planets undergo in their birth environments is essential for mapping their present-day demographics to their primordial populations. Hot Jupiters – giant planets with orbital periods under ten days – provide a...
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Atte Keitaanranta (University of Helsinki)28/05/2026, 17:45Oral
Some recent cosmological simulations have started to model the dynamics of supermassive black holes (SMBHs) with dynamical friction subgrid models instead of repositioning. Such simulations predict a population of wandering black holes in massive galaxies, with the most massive systems including more than a thousand wandering black holes. We run a series of cosmological zoom-in simulations...
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Iikka Mäntynen (University of Turku)28/05/2026, 17:45Oral
Core-collapse supernovae (CCSNe) in luminous infrared galaxies (LIRGs) can have extreme line-of-sight host galaxy dust extinctions, which leads to a large fraction of the events to remain undetected by optical and infrared surveys. This population of undetected CCSNe is important to constrain in order to determine the cosmic CCSN rates, which can be used to estimate the cosmic star formation...
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Venla Kangas (University of Turku)28/05/2026, 18:00Oral
When a star passes too close to a supermassive black hole, it gets disrupted and torn apart by the tidal forces in an event known as a tidal disruption event (TDE). The emission from TDEs is observed across the electromagnetic spectrum, with the majority discovered in ultraviolet and optical wavelengths. However, an increasing number of TDEs have been observed to exhibit long-lasting infrared...
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Christian Vassallo (Department of Physics and Astronomy, University of Turku)28/05/2026, 18:00Oral
Core-collapse supernova (SN) rates hold important information on the evolution of galaxies over cosmic time. In this study, we examine the connection between core-collapse SNe and star formation rates (SFRs) using newly derived SN rates from the JWST Advanced Deep Extragalactic Survey (JADES) extending to redshift z ≈ 5. We compare the observed SN rates with the expected rates based on...
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Vesa Björn (University of Helsinki)28/05/2026, 18:00Oral
Lunar swirls are bright-albedo areas on the surface of the Moon that appear to twist and turn across the surface. Multiple swirl formation processes have been hypothesized, including shielding from space weathering, i.e., small meteoroid impacts and charged particles from the Sun (e.g., Hood & Schubert, Sci 208, 49, 1980), dust accumulation and lofting (e.g., Garrick-Bethell et al., Icar 212,...
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Erin O'Sullivan29/05/2026, 09:00Oral
I will discuss recent highlights from the world's largest neutrino telescope: the IceCube Neutrino Observatory, with particular emphasis on activities in the Nordic countries.
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Damien DORNIC (CPPM)29/05/2026, 09:38Oral
The KM3NeT multi-site detector is designed to detect and study cosmic neutrinos and their sources in the Universe, as well as to improve the intrinsic neutrino properties knowledge. Comprising two underwater Cherenkov neutrino telescopes located at two deep-sea sites in the Mediterranean, the KM3NeT infrastructure includes KM3NeT-ARCA, offshore Portopalo di Capo Passero (Sicily, Italy), which...
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29/05/2026, 11:00
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29/05/2026, 11:10
(to be revealed later)
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