Tatsuya Matsumoto: A new analytical approach to analyze shock interacting supernovae

Thursday 16 Nov 2023, 13:00 → 14:00 Europe/Stockholm

Recent observations discovered that a small fraction of core-collapse supernovae (SNe) show peculiar light curves such as double peaks and bumpy structure. A promising mechanism to produce these behaviors is a shock interaction between SN ejecta and circumstellar material (CSM). In this scenario, the light curve is shaped by the emission from the shock and the CSM should have a non-uniform density profile corresponding to the observed peaks or bumps, which may tell us the last activity of massive stars before core-collapse. However, most studies on shock interacting SNe assume a power-law like smooth CSM density profiles and cannot be applied to multi-peak SNe. In this talk, I propose a new analytical technique to analyze multi-peak SNe and estimate the CSM profile. I’ll demonstrate its application to observed several SNe, reconstruct the CSM profile, and estimate the SN ejecta parameters.