论文标题
超紧凑型X射线二进制的可检测性作为丽莎源
Detectability of ultra-compact X-ray binaries as LISA sources
论文作者
论文摘要
超紧凑型X射线二进制文件（UCXB）是具有超短轨道周期（通常少于1小时）的低质量X射线二进制物和富有贫气的供体星，这被认为是潜在的LISA来源。在这项工作中，我们首先采用MESA代码来检查Lisa将检测到的UCXB祖细胞的参数空间。我们的模拟表明，具有中子星和$ 0.4-3.3〜M _ {\ odot} $伴随星的初始二进制型在小于初始轨道周期的轨道上，可能会演变为UCXB，其中一些可能会引起引力信号，而LISA可以检测到LISA可检测的引力信号。但是，将在10 kpc的距离内演变为UCXB-LISA来源的二进制文件的初始轨道周期位于非常狭窄的范围内，即这些Lisa源的形成需要对初始参数的极端细微调整。根据特征性污渍和最大可检测到的距离，在八个具有观察到距离的UCXB中，有四个来源将由LISA检测到。基于详细的二进制进化模型给出的参数空间和快速二进制星星演化代码，估计在银河系中以LISA源出现的UCXB的出生估计为$（2-2.6）\ times10^{\ rm -6}〜\ rm yr yr yr yr yr^{ - 1} $。考虑到UCXB在球状簇中的贡献，UCXB -LISA来源的数量可以达到$ 240-320 $。尽管形成条件很严重，但丽莎UCXB的可检测性仍然是乐观的和意义上的，因为它们提供了进行全面的多通信研究的机会。
Ultra-compact X-ray binaries (UCXBs) are low-mass X-ray binaries with ultra-short orbital periods (usually less than 1 hour) and hydrogen-poor donor stars, which are proposed to be the potential LISA sources. In this work, we firstly employ the MESA code to examine the parameter space of the progenitors of UCXBs that LISA will detect. Our simulations indicate that the initial binaries with a neutron star and a $0.4-3.3~M_{\odot}$ companion star in an orbit of initial orbital period smaller than the bifurcation period could evolve into UCXBs, some of which will emit gravitational wave signals that can be detectable by the LISA. However, the initial orbital periods of the binaries that will evolve into UCXB-LISA sources in a distance of 10 kpc are located in a very narrow range, i.e. the formation of these LISA source requires an extremely fine-tuning of initial parameter. According to the characteristic stains and the derived maximum detectable distances, four sources among eight UCXBs with the observed distances are expected to be detected by the LISA. Based on the parameter space given by the detailed binary evolution models and the rapid binary star evolution code, the birthrate of UCXBs appearing as LISA sources in the Galaxy is estimated to be $(2-2.6)\times10^{\rm -6}~\rm yr^{-1}$. Considering the contribution of UCXBs in the globular clusters, the number of UCXB-LISA sources can reach $240 - 320$. Although the formation condition is severe, the detectability of UCXBs by the LISA is still optimistic and significant because they provide an opportunity to pursue full multi-messenger investigations.
