Subdwarf B stars as possible surviving companions in Type Ia supernova remnants

Subdwarf B stars as possible surviving companions in Type Ia supernova remnants
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亚矮星 B 星可能是 Ia 型超新星遗迹中幸存的伴星

DOI:
10.1093/mnras/sty3092
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发表时间:
2018-11
影响因子:
4.8
通讯作者:
Jiao Li
Jiao Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xiangcun Meng;Jiao Li

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尽管 Ia 型超新星(SNe Ia)在许多天体物理学领域都非常重要,但关于它们的前身模型的争论仍然无休无止。在超新星遗迹(SNR)中搜索幸存的伴星可以区分不同的祖细胞模型,因为单简并(SD)模型的遗迹中仍然存在伴星,但双简并(DD)模型则不存在。然而,最近的一些调查并没有发现SN 1006和开普勒超新星残骸中幸存的伴星,这似乎不利于SD模型。这样的结果可能是由于调查目标不正确而得出的。这里,基于超新星 Ia 的共包络风 SD 模型,其中初始双星系统由白矮星 (WD) 和主序 (MS) 星组成,我们发现,如果假设自旋下降时间尺度小于 $10^{\rm 7}$ 年,超新星爆炸时刻的伴星可能是 MS、红巨星 (RG) 或亚矮 B (sdB) 星。我们展示了超新星爆炸时刻伴星的属性,这是在信噪比中寻找幸存伴星的关键线索。在这里,我们认为 sdB 星可能是某些 SNR 中幸存的伴星,即使祖系统是 WD + MS 系统。 SNe Ia 与 sdB 伴星对所有 SNe Ia 的贡献可能高达 22%。
Although type Ia supernovae (SNe Ia) are so important in many astrophysical fields, a debate on their progenitor model is still endless. Searching the surviving companion in a supernova remnant (SNR) may distinguish different progenitor models, since a companion still exists in the remnant for the single-degenerate (SD) model, but does not for the double degenerate (DD) model. However, some recent surveys do not discover the surviving companions in the remnant of SN 1006 and Kepler's supernova, which seems to disfavor the SD model. Such a result could be derived from an incorrect survey target. Here, based on the common-envelope wind SD model for SNe Ia, in which the initial binary system consists of a white dwarf (WD) and a main-sequence (MS) star, we found that the companion at the moment of supernova explosion may be a MS, red-giant (RG) or subdwarf B (sdB) star if a spin-down timescale of less than $10^{\rm 7}$ yr is assumed. We show the properties of the companions at the moment of supernova explosion, which are key clues to search the surviving companions in SNRs. Here, we suggest that the sdB star may be the surviving companion in some SNRs, even if the progenitor systems are the WD + MS systems. The SNe Ia with the sdB companions may contribute to all SNe Ia as much as 22\%.
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