SN 2020udy: A new piece of the homogeneous bright group in the diverse Iax subclass
Mridweeka Singh, Devendra K. Sahu, Barnabas Barna, Anjasha, Gangopadhyay, Raya Dastidar, Rishabh Singh Teja, Kuntal Misra, D. Andrew, Howell, Xiaofeng Wang, Jun Mo, Shengyu Yan, Daichi Hiramatsu, Craig, Pellegrino, G. C. Anupama, Arti Joshi, K. Azalee Bostroem, Jamison Burke,

TL;DR
SN 2020udy, a bright type Iax supernova, exhibits spectral and light curve features consistent with deflagration of a Carbon-Oxygen white dwarf, with detailed spectral analysis revealing ejecta stratification and chemical mixing.
Contribution
This study provides detailed optical observations and spectral modeling of SN 2020udy, highlighting its similarities to bright Iax supernovae and offering insights into its explosion mechanism.
Findings
SN 2020udy synthesized about 0.08 solar masses of $^{56}$Ni.
Spectral features show weak Si II lines and dominance of Iron Group Elements at late times.
Spectral modeling suggests ejecta stratification and chemical mixing.
Abstract
We present optical observations and analysis of a bright type Iax SN~2020udy hosted by NGC 0812. The light curve evolution of SN~2020udy is similar to other bright Iax SNe. Analytical modeling of the quasi bolometric light curves of SN 2020udy suggests that 0.080.01 M of Ni would have been synthesized during the explosion. Spectral features of SN 2020udy are similar to the bright members of type Iax class showing weak Si {\sc II} line. The late-time spectral sequence is mostly dominated by Iron Group Elements (IGEs) with broad emission lines. Abundance tomography modeling of the spectral time series of SN~2020udy using TARDIS indicates stratification in the outer ejecta, however, to confirm this, spectral modeling at a very early phase is required. After maximum light, uniform mixing of chemical elements is sufficient to explain the spectral evolution. Unlike the…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Astro and Planetary Science · Nuclear Physics and Applications
