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arXiv 2107.03565astro-ph.HEastro-ph.SRgr-qc
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具有致密伴星的黑洞双星的星族合成

Population Synthesis of Black Hole Binaries with Compact Star Companions

Yong Shao, Xiang-Dong Li

摘要:

本文系统地研究了黑洞(BH)双星与致密星(CS)伴星的合并,包括黑洞-白矮星(BH-WD)、黑洞-中子星(BH-NS)和黑洞-黑洞(BH-BH)系统。以往的研究表明,传质稳定性和共同包络演变可以显着影响合并BH-CS通过孤立的二元演化的形成。详细的二进制演化模拟,我们获得易于使用的标准发生的共同包络相的质量转移BH二进制与非简并捐助者,并纳入人口合成计算。为了探讨NS和BH之间可能存在的质量差对合并BH-CS双星总体性质的影响,我们采用了不同的超新星机制,包括\textit{rapid}、\textit{delayed}和\textit{stochastic}公式来处理致密的残余质量和出生踢.我们的计算表明,银河系中存在着$ \sim 10^{5} -10^{6}$ BH-CS双星,其中有几十个是未来天基引力波探测器可以观测到的。我们估计所有BH-CS系统的局部合并率密度为$ \sim 60-200 \,\rm Gpc^{-3}yr^{-1}$。虽然没有通过\textit{rapid}超新星形成的低质量黑洞,但\textit{delayed}和\textit{stochastic}两个公式都预测合并BH-WD/BH-NS/BH-BH双星的$ \sim 100\% $/$ \sim 70\% $ / $ \sim 30\% $可能在质量间隙内有BH成分。

英文摘要:

We perform a systematic study of merging black hole (BH) binaries with compact star (CS) companions, including black hole--white dwarf (BH--WD), black hole--neutron star (BH--NS) and black hole--black hole (BH--BH) systems. Previous studies have shown that mass transfer stability and common envelope evolution can significantly affect the formation of merging BH--CS binaries through isolated binary evolution. With detailed binary evolution simulations, we obtain easy-to-use criteria for the occurrence of the common envelope phase in mass-transferring BH binaries with a nondegenerate donor, and incorporate into population synthesis calculations. To explore the impact of possible mass gap between NSs and BHs on the properties of merging BH--CS binary population, we adopt different supernova mechanisms involving the \textit{rapid}, \textit{delayed} and \textit{stochastic} prescriptions to deal with the compact remnant masses and the natal kicks. Our calculations show that there are $ \sim 10^{5} -10^{6}$ BH--CS binaries in the Milky Way, among which dozens are observable by future space-based gravitational wave detectors. We estimate that the local merger rate density of all BH--CS systems is $ \sim 60-200 \,\rm Gpc^{-3}yr^{-1}$. While there are no low-mass BHs formed via \textit{rapid} supernovae, both \textit{delayed} and \textit{stochastic} prescriptions predict that $ \sim 100\% $/$ \sim 70\% $/$ \sim 30\% $ of merging BH--WD/BH--NS/BH--BH binaries are likely to have BH components within the mass gap.

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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