detalle del documento
IDENTIFICACIÓN
oai:arXiv.org:2407.07417
Tema
Astrophysics - High Energy Astroph...Autor
Sharon, Amir Kushnir, Doron Schinasi-Lemberg, EdenCategoría
ciencias: astrofísica
Año
2024
fecha de cotización
17/7/2024
Palabras clave
sne t_0 observed m_\mathrm{ni56} $-$ $\gamma$-ray $ iaResumen
A rare subclass of Type Ia supernovae (SNe Ia), named after the prototype SN 2003fg, includes some of the brightest SNe Ia, often called "super Chandrasekhar-mass" SNe Ia.
We calculate the $\gamma$-ray deposition histories and the $^{56}$Ni mass synthesized in the explosion, $M_\mathrm{Ni56}$, for eight 2003fg-like SNe.
Our findings reveal that the $\gamma$-ray escape time, $t_0$, for these objects is $ t_0\approx45\text{-}60 \,$ days, significantly higher than that of normal SNe Ia.
2003fg-like SNe are distinct from normal SNe Ia in the $ t_0 $-$ M_\mathrm{Ni56} $ plane, with a noticeable gap between the two populations.
The observed position of 2003fg-like SNe in this plane poses a significant challenge for theoretical explosion models.
We demonstrate that the merger of two white dwarfs (WDs) and a single star exceeding the Chandrasekhar limit fail to reproduce the observed $ t_0 $-$ M_\mathrm{Ni56} $ distribution.
However, preliminary calculations of head-on collisions of massive WDs show agreement with the observed $ t_0 $-$ M_\mathrm{Ni56} $ distribution.
;Comment: 16 pages, 7 figures.
Submitted to MNRAS
Sharon, Amir,Kushnir, Doron,Schinasi-Lemberg, Eden, 2024, High $\gamma$-ray escape time in 2003fg-like supernovae: A challenge to proposed models
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