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arXiv 2302.04812astro-ph.HEastro-ph.SR
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黑洞-中子星引力波源的母源模拟

Simulations of the progenitors of black hole-neutron star gravitational wave sources

Long Jiang, Wen-Cong Chen, Thomas M. Tauris, Bernhard Muller, Xiang-Dong Li

摘要:

最近发现的可能起源于黑洞(BH)+中子星(NS)并合的引力波(GW)事件揭示了BH+NS双星的存在。通过对孤立双星演化过程中BH+NS双星的形成和合并速率的模拟研究,已经得到了广泛的应用。然而,在文献中缺少关于这一种群形成的详细的恒星演化模型。在这项工作中,我们对30多个BH+NS祖系统进行了第一个完整的1D模型,这些系统是自洽计算的,直到铁核以超过1000 km s^-1的速度坍缩。针对BH-NS GW源的祖先,我们应用MESA代码,从一个具有短轨道周期(< 1天)的后共包络双星开始,该双星由一颗BH和一颗经历稳定质量转移的零年龄主序星组成。这些NS质量可能会显着更大,这取决于超新星爆炸期间的确切质量切割。这些BH+NS系统很可能在哈勃时间内合并并产生GW事件。系统C是类GW 200115事件的潜在祖先,而系统A和B可能是类GW 200105事件的候选者,并可能代表X射线双星SS 433的最终命运。

英文摘要:

Recent discoveries of gravitational wave (GW) events most likely originating from black hole (BH) + neutron star (NS) mergers reveal the existence of BH+NS binaries. The formation of BH+NS binaries and their merger rates through isolated binary evolution have been investigated extensively with population synthesis simulations. A detailed stellar evolution modelings of the formation of this population, however, is missing in the literature. In this work, we perform the first complete 1D model of more than 30 BH+NS progenitor systems which are calculated self-consistently until the iron core collapse with infall velocity exceeds 1000 km s^-1. Focusing on the progenitors of BH- NS GW sources, we apply the MESA code starting from a post-common envelope binary with short orbital period (< 1 day) consisting of a BH and a zero-age main-sequence helium star that experiences stable mass transfer. These NS masses could be significantly larger depending on the exact mass cut during the supernova explosion. These BH+NS systems are likely to merge and produce GW events within a Hubble time. System C is a potential progenitor of a GW200115-like event, while Systems A and B are possible candidates for a GW200105-like event and may represent the final destiny of the X-ray binary SS433.

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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