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arXiv 2005.01880astro-ph.SRastro-ph.HE
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白矮星双星中通过吸积诱导坍缩形成中子星系统

The formation of neutron star systems through accretion-induced collapse in white-dwarf binaries

Bo Wang, Dongdong Liu

摘要:

吸积诱导坍缩(AIC)假说是40年前提出的氧氖白矮星(ONe WD)的演化终态,它将氧氖白矮星与中子星(NS)系统的形成联系起来。然而,迄今为止还没有直接探测到任何AIC事件,尽管存在大量的间接观测证据。同时,通过AIC形成NS的进化途径仍然没有得到很好的研究。本文综述了近年来关于AIC事件的两种经典的祖细胞模型,单简并模型(包括ONe WD+MS/RG/He星型通道和CO WD+He星型通道)和双简并模型(包括CO/ONe WD双通道和ONe WD+CO WD通道)。综述了近年来这类模型的研究进展,包括演化场景、初始参数空间和相关对象。对于单简并模型,前AIC系统可能被识别为超软X射线源,共生体和激变变星,而后AIC系统可以被识别为低/中等质量X射线双星和由此产生的低/中等质量双星双星,特别是毫秒双星。对于双退化模型,前AIC系统是封闭的双WD,而后AIC系统是具有特殊性质的孤立NS。我们还回顾了预测的AIC事件,NS的质量分布,和引力波(GW)信号从双WD是潜在的GW源在银河系的背景下,未来的天基GW探测器。本文总结了近年来AIC事件探测的理论和观测限制。为了证实AIC过程的存在,解决现有恒星演化理论长期存在的问题,还需要更多的数值模拟和观测验证。

英文摘要:

The accretion-induced collapse (AIC) scenario was proposed 40 years ago as an evolutionary end state of oxygen-neon white-dwarfs (ONe WDs), linking them to the formation of neutron star (NS) systems. However, there has been no direct detection of any AIC event so far, even though there exists a lot of indirect observational evidence. Meanwhile, the evolutionary pathways resulting in NS formation through AIC are still not well investigated. In this article, we review recent studies on the two classic progenitor models of AIC events, i.e., the single-degenerate model (including the ONe WD+MS/RG/He star channels and the CO WD+He star channel) and the double-degenerate model (including the double CO/ONe WD channels and the ONe WD+CO WD channel). Recent progress on these progenitor models is reviewed, including the evolutionary scenarios, the initial parameter space and the related objects. For the single-degenerate model, the pre-AIC systems could potentially be identified as supersoft X-ray sources, symbiotics and cataclysmic variables, whereas the post-AIC systems could be identified as low-/intermediate-mass X-ray binaries and the resulting low-/intermediate-mass binary pulsars, most notably millisecond pulsars. For the double-degenerate model, the pre-AIC systems are close double WDs, whereas the post-AIC systems are isolated NSs with peculiar properties. We also review the predicted rates of AIC events, the mass distribution of NSs, and the gravitational wave (GW) signals from double WDs that are potential GW sources in the Galaxy in the context of future space-based GW detectors. Recent theoretical and observational constraints on the detection of AIC events are summarized. In order to confirm the existence of the AIC process, and resolve this long-term issue presented by current stellar evolution theories, more numerical simulations and observational identifications are required.

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