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arXiv 0912.0757astro-ph.HEastro-ph.COastro-ph.SR
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Ia型超新星的前身:它们是超软源吗?

The Progenitors of Type Ia Supernovae: Are They Supersoft Sources?

Rosanne Di Stefano

摘要:

在经典模型中,Ia型超新星(SNe Ia)的前身是吸积的、核燃烧的白矮星(NBWD),当白矮星达到克拉塞卡质量M_C时,NBWD爆炸。这种大质量的NBWD是热的(kT ~100 eV),发光的(L ~ 10^{38} erg/s),并且可能作为发光的超软X射线源(SSS)被观察到。在过去几年中,对星系外的软X射线源进行了调查。本文表明,结果证伪的假设,即大部分的祖细胞是NBWD,目前可观察到的SSS。这些数据也限制了亚M_C模型。虽然Ia型超新星的祖先可能会经历一个或多个SSS活动阶段,但这些阶段远远短于吸积大部分物质所需的时间,使它们接近M_C。

英文摘要:

In a canonical model, the progenitors of Type Ia supernovae (SNe Ia) are accreting, nuclear-burning white dwarfs (NBWDs), which explode when the white dwarf reaches the Chandrasekhar mass, M_C. Such massive NBWDs are hot (kT ~100 eV), luminous (L ~ 10^{38} erg/s), and are potentially observable as luminous supersoft X-ray sources (SSSs). During the past several years, surveys for soft X-ray sources in external galaxies have been conducted. This paper shows that the results falsify the hypothesis that a large fraction of progenitors are NBWDs which are presently observable as SSSs. The data also place limits on sub-M_C models. While Type Ia supernova progenitors may pass through one or more phases of SSS activity, these phases are far shorter than the time needed to accrete most of the matter that brings them close to M_C.

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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