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arXiv 1805.04845astro-ph.SRastro-ph.HE
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Ia型超新星的可能的白矮星祖先

Possible white dwarf progenitors of type Ia supernovae

Ealeal Bear, Noam Soker

摘要:

我们研究了白矮星(WD)的星表,发现在核简并的框架下,有足够数量的质量大于1.35Mo的白矮星可能爆发为Ia型超新星(SNe Ia)。在核心简并的情况下,WD与巨星的碳氧核心合并,形成一个巨大的WD,可能会延迟数年到数十亿年的时间爆炸。如果所有的Ia超新星都是由核心简并的情况来解释的话,那么我们计算出银河系中大约有0.2%的WD是大质量的。此外,我们发现,从目录中的大质量WD相对于所有WD的分数约为1- 3%,具有很大的不确定性。也就是说,五到十倍的所需数量。如果有许多超新星Ia是由低质量的WDs(M_WD < 1.3Mo)引起的,而另一种情况是由另一种情况引起的,并且核心简并情况只考虑了超新星Ia爆炸为大质量的WDs,那么观测到的大质量WDs与所需的比值甚至更大。我们的发现留下的核心简并方案作为一个可行的和有前途的超新星Ia方案。

英文摘要:

We examine catalogs of white dwarfs (WDs) and find that there are sufficient number of massive WDs, M_WD > 1.35Mo, that might potentially explode as type Ia supernovae (SNe Ia) in the frame of the core degenerate scenario. In the core degenerate scenario a WD merges with the carbon-oxygen core of a giant star, and they form a massive WD that might explode with a time delay of years to billions of years. If the core degenerate scenario accounts for all SNe Ia, then we calculate that about 0.2 per cent of the present WDs in the Galaxy are massive. Furthermore, we find from the catalogs that the fraction of massive WDs relative to all WDs is about 1-3 per cent, with large uncertainties. Namely, five to ten times the required number. If there are many SNe Ia that result from lower mass WDs, M_WD < 1.3Mo, for which another scenario is responsible for, and the core degenerate scenario accounts only for the SNe Ia that explode as massive WDs, then the ratio of observed massive WDs to required is larger even. Our finding leaves the core degenerate scenario as a viable and promising SN Ia scenario.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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