| Name: | Mridweeka Singh |
| Affiliation: | Indian Institute of Astrophysics |
| Conference ID : | ASI2024_89 |
| Title : | Type Iax SNe: An emerging heterogeneous class of white dwarf explosion |
| Authors : | Mridweeka Singh and D.K. Sahu on behalf of a larger collaboration |
| Authors Affiliation: | Indian Institute of Astrophysics, Koramangala 2nd Block, Bangalore 560034, India |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | We present observational properties of a bright type Iax SN 2018cni and a faint type Iax SN 2020kyg in the optical domain. SN 2018cni is a bright type Iax SN (Mv, peak = −17.81±0.21 mag) whereas SN 2020kyg (Mv, peak = −14.52±0.21 mag) is a faint one. We derive 56Ni mass of 0.07 and 0.002 M⊙, and ejecta mass of 0.48 and 0.14 M⊙ for SNe 2018cni and 2020kyg, respectively.
A combined study of the bright and faint type Iax SNe in the R/r- band reveals that the brighter objects tend to have a longer rise time. However, the correlation between the peak luminosity and decline rate shows that bright and faint type Iax SNe exhibit distinct behavior.
Comparison with standard deflagration models suggests that SN 2018cni is consistent with the deflagration of a CO white dwarf whereas the properties of SN 2020kyg can be better explained by the deflagration of a hybrid CONe white dwarf. The spectral features of both the SNe point to the presence of similar chemical species but with different mass fractions. Our spectral modeling indicates stratification at the outer layers and mixed inner ejecta for both the SNe.
A combined study of these two type Iax SNe along with other type Iax SNe indicates the heterogeneous nature of this rare class.
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