| Name: Monalisa Dubey |
| Affiliation: Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital |
| Conference ID: ASI2026_192 |
| Title: SN 2022xus: bridging the gap between Type IIP and IIL supernovae |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Monalisa Dubey(ARIES, Nainital-263001, MJPRU, Bareilly, Uttar Pradesh-243006), Kuntal Misra(ARIES, Nainital), Kumar Pranshu(ARIES, Nainital) |
| Abstract: We present optical photometric and spectroscopic observations of the Type II supernova SN 2022xus. The SN reached its
peak V-band magnitude within ∼7 days of explosion, followed by a plateau phase lasting ∼86 days with a declination rate of
∼1.3 mag/100 day. Early time spectra exhibit broad features caused by the blending of several high-ionization lines, likely
arising from relatively weak interaction between the SN ejecta and the surrounding circumstellar medium (CSM). Compared
to typical Type IIP SNe, SN 2022xus exhibits a smaller H𝛼 absorption-to-emission ratio (𝑎/𝑒), indicating a relatively less
hydrogen envelope mass at the time of explosion. The presence of a double-peaked H𝛼 profile suggests either asymmetric CSM
or intrinsic asymmetry in the ejecta. From nebular-phase spectroscopy and bolometric light curve modelling, the progenitor
mass is estimated to be in the range of 12 – 15 M⊙. Although several photometric and spectroscopic characteristics place the SN
within the Type IIL population, it displays mixed properties of both Type IIP and Type IIL SNe and cannot be cleanly classified into
either subclass. We therefore identify SN 2022xus as a transitional event between Type IIP and Type IIL SNe, providing further
evidence for a continuum between these two classes. |
