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arXiv 2104.07066astro-ph.HE
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反应介质中的Bondi-Hoyle-Lyttleton吸积:爆轰点火和Ia型超新星的一种机制

Bondi-Hoyle-Lyttleton Accretion in a Reactive Medium: Detonation Ignition and a Mechanism for Type Ia Supernovae

Heinrich Steigerwald, Emilio Tejeda

摘要:

反应介质中的爆轰起爆可以通过外部产生的冲击波来实现。进入引力中心的超音速流动,称为邦迪-霍伊尔-利特尔顿(BHL)吸积,是一种自然的冲击波产生过程,但据我们所知,文献中从未考虑过反应介质。在这里,我们进行了一个数量级的分析,以调查在何种条件下,冲击诱导的反应区重新耦合到冲击波阵面。我们推导了自持爆轰点火的三个半解析判据。我们应用这些标准的特殊情况下,一个原始黑洞(PBH)的小行星质量穿越碳氧白矮星(WD)。由于碳氧WD中的爆炸被认为会产生正常的热核超新星(SNe Ia),因此从保守(乐观)分析来看,观测到的SNe Ia速率将暗物质(DM)以PBH形式存在的部分限制为$\log_{10}(f_{\rm PBH})< 0.8 \log_{10}(M_{\rm BH}/3\times 10^{22}{\rm g})$在$10^{21}\!-\!10^{22}$ g($10^{20}\!-\!10^{22}$ g)范围内。最重要的是,如果DM的一个重要部分是质量为$10^{23}$ g的PBH形式,这些遭遇可以解释正常的亚克拉塞卡超新星Ia的速率和中值爆炸质量。

英文摘要:

Detonation initiation in a reactive medium can be achieved by an externally created shock wave. Supersonic flow onto a gravitating center, known as Bondi-Hoyle-Lyttleton (BHL) accretion, is a natural shock wave creating process, but, to our knowledge, a reactive medium has never been considered in the literature. Here, we conduct an order of magnitude analysis to investigate under which conditions the shock-induced reaction zone recouples to the shock front. We derive three semianalytical criteria for self-sustained detonation ignition. We apply these criteria to the special situation where a primordial black hole (PBH) of asteroid mass traverses a carbon-oxygen white dwarf (WD). Since detonations in carbon-oxygen WDs are supposed to produce normal thermonuclear supernovae (SNe Ia), the observed SN Ia rate constrains the fraction of dark matter (DM) in the form of PBHs as $\log_{10}(f_{\rm PBH})< 0.8 \log_{10}(M_{\rm BH}/3\times 10^{22}{\rm g})$ in the range $10^{21}\!-\!10^{22}$g ($10^{20}\!-\!10^{22}$g) from a conservative (optimistic) analysis. Most importantly, these encounters can account for both the rate and the median explosion mass of normal sub-Chandrasekhar SNe Ia if a significant fraction of DM is in the form of PBHs with mass $10^{23}$g.

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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