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arXiv 1908.05102astro-ph.HEastro-ph.SR
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暗物质混合白矮星的吸积诱导坍缩-- I:低质量中子星的形成

Accretion-Induced Collapse of Dark Matter Admixed White Dwarfs -- I: Formation of Low-mass Neutron Stars

Shing-Chi Leung, Shuai Zha, Ming-Chung Chu, Lap-Ming Lin, Ken'ichi Nomoto

摘要:

最近观测到的质量为$\sim 1.1 ~M_{\odot}$的超新星对传统的中子星的核塌缩超新星形成路径提出了挑战。利用球对称流体动力学模拟,我们跟踪了电子俘获引发的大质量白矮星(WD)核的坍缩,直到形成原NS(PNS)。对于具有相同中心密度的初始WD模型,我们研究了静态的、致密的暗物质(DM)混合核对PNS的坍缩和反弹动力学以及质量的影响,DM质量为$\sim 0.01 ~M_{\odot}$。我们发现,增加混合DM质量通常会导致较慢的崩溃和较小的PNS质量,下降到约1.0 $M_{\odot}$。我们的研究结果表明,暗物质混合白矮星的吸积引起的坍缩可以产生低质量的中子星,如观察到的低质量脉冲星J 0453 +1559,这是不能得到的常规NS形成路径的CCSN。

英文摘要:

Recently observed pulsars with masses $\sim 1.1 ~M_{\odot}$ challenge the conventional neutron star (NS) formation path by core-collapse supernova (CCSN). Using spherically symmetric hydrodynamics simulations, we follow the collapse of a massive white dwarf (WD) core triggered by electron capture, until the formation of a proto-NS (PNS). For initial WD models with the same central density, we study the effects of a static, compact dark matter (DM) admixed core on the collapse and bounce dynamics and mass of the PNS, with DM mass $\sim 0.01 ~M_{\odot}$. We show that increasing the admixed DM mass generally leads to slower collapse and smaller PNS mass, down to about 1.0 $M_{\odot}$. Our results suggest that the accretion-induced collapse of dark matter admixed white dwarfs can produce low-mass neutron stars, such as the observed low-mass pulsar J0453+1559, which cannot be obtained by conventional NS formation path by CCSN.

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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