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arXiv 2407.07417astro-ph.HE
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2003fg型超新星中较长的$\gamma$射线逃逸时间:对现有模型的挑战

High $γ$-ray escape time in 2003fg-like supernovae: A challenge to proposed models

Amir Sharon, Doron Kushnir, Eden Schinasi-Lemberg

AI总结:

针对2003fg型超亮Ia型超新星,研究测算其$\gamma$射线逃逸时间与$^{56}$Ni质量,发现其特征与普通Ia型超新星有显著差异,现有双白矮星并合、单星超钱德拉塞卡极限模型均无法解释,大质量白矮星正面碰撞模型初步符合观测。

摘要:

以原型SN 2003fg命名的Ia型超新星(SNe Ia)稀有子类包含部分最亮的Ia型超新星,常被称为“超钱德拉塞卡质量”Ia型超新星。我们计算了8颗2003fg型超新星的$\gamma$射线沉积历史,以及爆炸中合成的$^{56}$Ni质量$M_\mathrm{Ni56}$。研究发现,这类天体的$\gamma$射线逃逸时间$t_0$约为45-60天,显著高于普通Ia型超新星。2003fg型超新星在$t_0$-$M_\mathrm{Ni56}$平面上与普通Ia型超新星存在明显差异,两类天体之间有显著间隔。2003fg型超新星在该平面的观测位置对理论爆炸模型构成重大挑战。我们证明,双白矮星(WDs)并合模型以及单星超过钱德拉塞卡极限的模型都无法复现观测到的$t_0$-$M_\mathrm{Ni56}$分布。不过,大质量白矮星正面碰撞的初步计算结果与观测到的$t_0$-$M_\mathrm{Ni56}$分布相符。

英文摘要:

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 $γ$-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 $γ$-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.

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