A global look into the world of interacting supernovae

Abstract

Interacting supernovae (SNe) IIn and Ibn show narrow emission lines and have always been a mysterious and unsolved genre in SNe physics. We present a comprehensive analysis of the temporal and spectroscopic behavior of a group of interacting SNe IIn and Ibn. We choose SNe 2012ab, 2020cui, 2020rc and 2019uo as representative members of these SN sub-types to probe the nature of explosion. Our study reveals that SNe IIn are heterogeneous, bright depicting multi-staged temporal evolution while SNe Ibn are moreover homogeneous, comparatively fainter than SNe IIn and short lived, but limited in a sample to firmly constrain the homogeneity. The spectroscopic features display a great diversity in Ha and He profiles for both SNe IIn and Ibn. The representative SN Ibn also show flash ionization signatures of CIII and NIII. Modeling of Ha reveals that SNe IIn have, in general, an asymmetric CSM which interacts with SN ejecta resulting in diversity in Ha profiles.