| Name: Naveen Dukiya |
| Affiliation: Aryabhatta Research Institute of observational sciencES (ARIES), Nainital |
| Conference ID: ASI2026_832 |
| Title: Understanding the CSM asymmetries of Interacting Supernovae |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Naveen Dukiya(Aryabhatta Research Institute of observational sciencES, Nainital), Kuntal Misra(Aryabhatta Research Institute of observational sciencES, Nainital), Anjasha Gangopadhyay(Stockholm University, Stockholm) |
| Abstract: Supernovae (SNe) that show an interaction between the ejecta and the circumstellar material (CSM) are referred to as interacting SNe. An additional piece of complexity in the study of these objects is the geometry of CSM. Spectroscopic and polarimetry studies over the last decade have shown that the CSM can assume asymmetric geometries (e.g. disk-like due to binary interactions) instead of spherically symmetric as expected from steady stellar winds.
Here, we present the spectroscopic evolution of 3 SNe ASASSN-14il, 2021foa, and 2024kgi as a case study of SNe that show signs of asymmetric CSM. These SNe show narrow and intermediate-width lines throughout their evolution with little asymmetries. However, both of these SNe show broad ejecta signatures on or before maximum light. We discuss how this can be achieved with different orientations of a disk-like CSM geometry. The symmetric line profiles and low polarization in ASASSN-14il favor a face-on CSM disk, whereas the evolution of narrow P-Cygni profile suggests the presence of line-of-sight CSM and edge-on CSM disk.
Additionally, we discuss other peculiar features of these SNe - the highly luminous lightcurve of ASASSN-14il with a plateau in the optical bands indicating very high mass-loss rates of upto 2-7 Msun/yr; the changing nature of the spectral evolution of SN 2021foa between type IIn and Ibn; and the implication of redside flux deficit in Hɑ profile of SN 2024kgi.
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