Abundance Stratification in Type Iax SN 2020rea with TARDIS

TL;DR

This study uses TARDIS to model the spectral evolution of SN 2020rea, revealing stratified ejecta early on that become more homogeneous over time, challenging pure deflagration models for Type Iax supernovae.

Contribution

First detailed spectral modeling of SN 2020rea showing stratified and evolving ejecta composition, questioning existing pure deflagration explosion models.

Findings

Early spectra indicate stratified, velocity-dependent abundances.

Ejecta become more homogeneous over time.

Pure deflagration models cannot fully explain observed features.

Abstract

Using the 1D Monte Carlo-based radiative transfer code TARDIS, we investigate the spectral evolution of the Type Iax supernova (SN) 2020rea from -7 days before to +21 days after maximum light. Our best-fit models indicate stratified, velocity-dependent abundances at early times, successfully reproducing most observed spectral features. As the SN evolves, the ejecta transition from a layered to a more homogeneous composition, posing an alternative to pure deflagration models that predict fully mixed ejecta. These results highlight the need for further investigation, as current pure deflagration models cannot fully explain the origin or spectral properties of Type Iax SNe like SN 2020rea.