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arXiv 1208.0953astro-ph.SR
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Ia型超新星在核简并情况下的祖先数

The number of progenitors in the core - degenerate scenario for type Ia supernovae

Marjan Ilkov, Noam Soker

摘要:

我们计算的预期数量的Ia型超新星(Ia型超新星)的核心退化(CD)的情况下,发现它匹配的不确定性的代码内的观测。在CD方案中,超白矮星白矮星(WD)是由WD伴星与大质量渐近巨星分支(AGB)恒星的热核合并在公共包络相的终止处形成的。我们使用一个简单的人口合成代码,避免了大的不确定性,估计最终的轨道分离的共同信封演变。相反,我们假设系统的核心的次级AGB星是更大的质量比WD残余的主星合并在终止的共同信封阶段。我们还使用一个简单的处方计数系统,有强相互作用在AGB阶段,但不是在早期的红巨星分支(RGB)阶段。使用恒星演化基本成分的一个非常简单的星族合成代码可以与观测到的Ia型超新星的速率相匹配,这可能表明CD情景在Ia型超新星的形成中起着重要作用。

英文摘要:

We calculate the expected number of type Ia supernovae (SN Ia) in the core-degenerate (CD) scenario and find it to match observations within the uncertainties of the code. In the CD scenario the super-Chandrasekhar mass white dwarf (WD) is formed at the termination of the common envelope phase from a merger of a WD companion with the hot core of a massive asymptotic giant branch (AGB) star. We use a simple population synthesis code that avoids the large uncertainties involved in estimating the final orbital separation of the common envelope evolution. Instead, we assume that systems where the core of the secondary AGB star is more massive than the WD remnant of the primary star merge at the termination of the common envelope phase. We also use a simple prescription to count systems that have strong interaction during the AGB phase, but not during the earlier red giant branch (RGB) phase. That a very simple population synthesis code that uses the basics of stellar evolution ingredients can match the observed rate of SN Ia might suggest that the CD-scenario plays a major role in forming SN Ia.

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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