Description
Chair: Ragnhild Lunnan
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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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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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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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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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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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