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arXiv 2310.16554astro-ph.HEastro-ph.SR
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超新星双爆轰情景中白矮星伴星的逃逸速度

The runaway velocity of the white dwarf companion in the double detonation scenario of supernovae

Jessica Braudo, Noam Soker

AI总结:

本研究考虑双爆轰情景中超新星抛射物有限速度,发现幸存白矮星逃逸速度比爆炸前轨道速度低8-11%,需更大初始质量,此类双星罕见,还支持该情景主要产生特殊Ia型超新星。

摘要:

我们考虑了存在白矮星(WD)质量供体伴星的Ia型超新星(SN Ia)双爆轰(DDet)情景中超新星抛射物的有限速度,发现幸存(质量供体)白矮星的逃逸速度比其爆炸前轨道速度低约8-11%。这意味着银河系中最快的逃逸白矮星若来自双爆轰情景,所需初始白矮星质量比忽略抛射物有限速度的简单计算结果更大。这种极端初始条件组合使此类双星系统更罕见。我们还初步发现内层抛射物偏离球对称,但程度不足以通过观测得出明确结论。研究结果支持双爆轰情景主要产生特殊Ia型超新星而非正常Ia型超新星的观点。

英文摘要:

We consider the finite velocity of the ejecta of a type Ia supernova (SN Ia) in the double detonation (DDet) scenario with a white dwarf (WD) mass-donor companion, and find that the runaway velocity of the surviving (mass donor) WD is lower than its pre-explosion orbital velocity by about 8-11%. This implies that the fastest runaway WDs in the Galaxy, if come from the DDet scenario, require even more massive WDs than what a simple calculation that neglects the finite ejecta velocity gives. This extreme set of initial conditions makes such binaries less common. We also tentatively find that the inner ejecta deviates from spherical symmetry, but not to the degree that we can use observations to make any claim. Our findings support the claim that the DDet scenario leads mostly to peculiar SNe Ia but not to normal SNe 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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