引力波搜索精密星历- III。Sco X-1的修订系统参数
Precision ephemerides for gravitational-wave searches -- III. Revised system parameters of Sco X-1
摘要：
低质量X射线双星中的中子星被认为是连续引力波的候选源。这些中子星通常每秒旋转数百次。吸积的过程可能会产生并支持致密物体的非轴对称扭曲，导致引力波的持续发射。我们提出了一个研究现有的光谱数据的Sco X-1，连续引力波搜索的主要目标，目的是提供修订后的关键轨道参数所需的定向搜索与先进的LIGO数据的约束。从圆轨道拟合到改进的波文辐射分量径向速度曲线，我们得到了更新的轨道周期和星历。中心的对称性测量从鲍文多普勒断层扫描产生一个中心的光盘组件的90公里$\mathrm{s^{-1}}$，我们解释为修订上限的NS $K_1$的预计轨道速度。通过MonteCarlo二进制参数计算，对$K_1$和转动加宽施加新的限制，我们得到了一套完整的动力学系统参数约束，包括40- 90 km $\mathrm{s^{-1}}$的新范围。最后，我们讨论了更新后的轨道参数对未来连续波搜索的影响。
英文摘要：
Neutron stars in low-mass X-ray binaries are considered promising candidate sources of continuous gravitational-waves. These neutron stars are typically rotating many hundreds of times a second. The process of accretion can potentially generate and support non-axisymmetric distortions to the compact object, resulting in persistent emission of gravitational-waves. We present a study of existing optical spectroscopic data for Sco X-1, a prime target for continuous gravitational-wave searches, with the aim of providing revised constraints on key orbital parameters required for a directed search with advanced-LIGO data. From a circular orbit fit to an improved radial velocity curve of the Bowen emission components, we derived an updated orbital period and ephemeris. Centre of symmetry measurements from the Bowen Doppler tomogram yield a centre of the disc component of 90 km $\mathrm{s^{-1}}$, which we interpret as a revised upper limit to the projected orbital velocity of the NS $K_1$. By implementing Monte Carlo binary parameter calculations, and imposing new limits on $K_1$ and the rotational broadening, we obtained a complete set of dynamical system parameter constraints including a new range for $K_1$ of 40--90 km $\mathrm{s^{-1}}$. Finally, we discussed the implications of the updated orbital parameters for future continuous-waves searches.
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