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Nordic-Baltic Astronomy Days 2026

26–29 May 2026
Radisson Blu Marina Palace Hotel
Europe/Helsinki timezone

Session

26-B1: Compact objects

Tu-06B
26 May 2026, 13:15
Room B

Room B

Description

Chair: Tuomo Salmi

Presentation materials

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  1. 229. Signatures of concealed super-Eddington accretion
    Varpu Ahlberg (University of Turku)
    26/05/2026, 13:15
    Oral

    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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  2. 230. Ruling out "twin star" equation of state
    Sofia Blomqvist (University of Helsinki)
    26/05/2026, 13:30
    Oral

    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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  3. 231. The origin of X-ray polarization in the soft state of Cygnus X-1: hybrid Comptonization scenario
    Anastasiia Bocharova (University of Turku)
    26/05/2026, 13:45
    Oral

    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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  4. 232. Relativistic Outflows and r-Process Nucleosynthesis from Magnetar Giant Flares
    Jakub Cehula (Tartu Observatory, University of Tartu)
    26/05/2026, 14:00
    Oral

    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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