| Name: | Vishal Ravishankar |
| Affiliation: | Indian Institute of Science Education and Research Pune |
| Conference ID : | ASI2024_687 |
| Title : | Study of a Fast Blue Optical Transient AT2022kmm and its Progenitor Evolution |
| Authors : | Vishal Ravishankar, F. Sutaria |
| Authors Affiliation: | Vishal Ravishankar Affiliation (Grad Indian Institute of Science Education and Research, Pune - 411008, India)
F. Sutaria Affiliation (Assoc. Prof. Indian Institute of Astrophysics, Bangalore - 560034, India) |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | We present an optical of the Fast Blue Optical Transient (FBOT) AT 2022kmm, a unique astronomical event characterized by a light curve comparable in brightness to superluminous supernovae but exhibiting a markedly rapid rise and fall. We carried out a comparative study of this faint event with other, better-characterized FBOTs, including AT2018cow. The light curves were modeled using MESA and SNEC, with mass loss introduced at varying epochs of the post-AGB phases. We employed two models to reproduce the distinctive light curve: one based on the circumstellar interaction of a pulsational pair-instability supernova (PPISN), and another involving a 15 solar mass Zero-Age Main Sequence (ZAMS) star that evolved to core-collapse, experiencing varying degrees of hydrogen envelope stripping. While neither model well reproduces the observed, double-peaked, light curve, the latter model, with complete stripping of the H-envelope, and a loss of 0.3 M_Sun of metals from the inner layers, is a better fit to the early, primary peak of the light curve. |
