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arXiv 1706.09413astro-ph.HE
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吸积中子星共包络涡卷产生的引力波

Gravitational Waves from Accreting Neutron Stars undergoing Common-Envelope Inspiral

A. Miguel Holgado, Paul M. Ricker, E. A. Huerta

摘要:

对于含有致密天体的密近双星系统来说,共包络相是一个可能的形成通道。普通包层中的中子星以邦迪-霍伊尔-利特尔顿吸积率的一小部分吸积,因为恒星包层是不均匀的,但仍然可以以超临界速率吸积(尽管不足以成为黑洞)。我们表明,共同的信封系统组成的中子星与一个大规模的主要可能是引力波源检测的先进LIGO波段远至麦哲伦云。为了表征它们的演化,我们使用一维模型的$12 M_\odot$和$20 M_\odot$原色进行轨道积分,考虑到吸积到NS和自旋演化的密度梯度的影响。从可能的吸积率相关的共同信封演变的范围内,我们发现,这些系统可能是响亮的引力波源比低质量的X射线双星,如斯科X-1,这是目前的目标,定向搜索连续的GW。我们还发现,他们的应变幅度信号可能允许新的约束的轨道分离和inspiral的时间尺度在共同的信封结合前共同的信封电磁观测。

英文摘要:

The common envelope phase is a likely formation channel for close binary systems containing compact objects. Neutron stars in common envelopes accrete at a fraction of the Bondi-Hoyle-Lyttleton accretion rate, since the stellar envelope is inhomogeneous, but may still be able to accrete at hyper-critical rates (though not enough to become black holes). We show that common envelope systems consisting of a neutron star with a massive primary may be gravitational wave sources detectable in the Advanced LIGO band as far away as the Magellanic Clouds. To characterize their evolution, we perform orbital integrations using 1D models of $12 M_\odot$ and $20 M_\odot$ primaries, considering the effects of density gradient on the accretion onto the NS and spin evolution. From the range of possible accretion rates relevant to common envelope evolution, we find that these systems may be louder gravitational wave sources than low-mass X-ray binaries like Sco X-1, which are currently the target of directed searches for continuous GWs. We also find that their strain amplitude signal may allow for novel constraints on the orbital separation and inspiral timescale in common envelopes when combined with pre-common envelope electromagnetic observations.

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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