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arXiv 2303.11571astro-ph.SRastro-ph.HE
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将ONe WD +He WD系统发展为超紧凑型X射线双星

Evolving ONe WD+He WD systems to ultra-compact X-ray binaries

Dongdong Liu, Bo Wang

摘要:

大质量白矮星的吸积诱导坍缩(AIC)是形成中子星(NS)双星必不可少的途径。虽然AIC事件的存在还没有直接的证据,但有几种NS系统被认为起源于AIC过程。代表性证据之一是在近轨道上探测到了具有超轻伴星(<=0.1 Msun)的强磁场和慢自旋NS。然而,以前的研究不能解释AIC事件的形成与这种低质量的同伴。在本工作中,我们演化出一系列ONe WD+He WD系统,形成AIC事件(称为He WD施主通道),当He WD重新填充Roche瓣时,NS双星表现为超紧凑X射线双星。我们发现ONe WD+He WD系统是AIC事件后新形成的NS+超轻伴星系统的可能通道。虽然有一些其他不一致的性质,检测到的伴星质量和轨道周期的4U 1626-67(一个新形成的NS双星与超轻的同伴)可以复制的HeWD供体通道。此外,结合以往的星震学结果,我们推测UCXB源(XTE J1751-305)可能来自He WD施主通道。

英文摘要:

It has been proposed that accretion-induced collapse (AIC) of massive white dwarfs (WDs) is an indispensable path for the formation of neutron star (NS) binaries. Although there are still no direct evidence for the existence of AIC events, several kinds of NS systems are suggested to originate from the AIC processes. One of the representative evidence is the detection of the strong magnetic field and slow spin NSs with ultra-light companions (<=0.1 Msun) in close orbits. However, previous studies cannot explain the formation of AIC events with such low-mass companions. In the present work, we evolve a series of ONe WD+He WD systems to the formation of AIC events (named as the He WD donor channel), and the NS binaries behave as ultra-compact X-ray binaries when the He WDs refill their Roche-lobes. We found that the ONe WD+He WD systems a possible channel for the formation of the newly formed NS+ultra-light companion systems just after the AIC event. Although there are some other inconsistent properties, the detected companion mass and orbital period of 4U 1626-67 (one of the newly formed NS binaries with ultra-light companions) can be reproduced by the He WD donor channel. In addition, combined with previous asteroseismology results, we speculate that an UCXB source (XTE J1751-305) may originate from the He WD donor channel.

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