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arXiv 2011.04414astro-ph.HEgr-qc
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在LIGO O2数据中寻找天蝎座X-1的连续引力波

Search for Continuous Gravitational Waves from Scorpius X-1 in LIGO O2 Data

Yuanhao Zhang, Maria Alessandra Papa, Badri Krishnan, Anna L. Watts

摘要:

我们提出的搜索结果在LIGO O2的公共数据连续引力波从中子星的低质量X射线双星天蝎座X-1。我们搜索在40-180 Hz范围内具有$\approx$恒定频率的信号。由于我们的搜索管道效率高,我们可以使用很长的相干时间,并实现前所未有的灵敏度,显着改善现有的结果。这是第一次能够探测到引力波振幅的搜索,这种振幅可以平衡中子星半径处的吸积扭矩。我们的搜索排除了在67.5 Hz和131.5 Hz之间的这个水平上的发射,对于从无线电观测得出的倾斜角$44^\circ \pm 6^\circ$(Fomalont等人,2001年),并假设自旋轴垂直于轨道平面。如果扭矩臂为$\approx $ 26 km --\alfven \半径的保守估计--我们的结果比整个带的间接限制更具约束性。这使我们能够排除某些质量半径组合,并对恒星磁场的强度设定上限。我们还纠正了文献中出现的一个错误,即在扭矩平衡时给出引力波振幅的方程(Abbott et al. 2017 b,2019 a),并据此重新解释了相关的最新LIGO/Virgo结果。

英文摘要:

We present the results of a search in LIGO O2 public data for continuous gravitational waves from the neutron star in the low-mass X-ray binary Scorpius X-1. We search for signals with $\approx$ constant frequency in the range 40-180 Hz. Thanks to the efficiency of our search pipeline we can use a long coherence time and achieve unprecedented sensitivity, significantly improving on existing results. This is the first search that has been able to probe gravitational wave amplitudes that could balance the accretion torque at the neutron star radius. Our search excludes emission at this level between 67.5 Hz and 131.5 Hz, for an inclination angle $44^\circ \pm 6^\circ$ derived from radio observations (Fomalont et al. 2001), and assuming that the spin axis is perpendicular to the orbital plane. If the torque arm is $\approx $ 26 km -- a conservative estimate of the \alfven\ radius -- our results are more constraining than the indirect limit across the band. This allows us to exclude certain mass-radius combinations and to place upper limits on the strength of the star's magnetic field. We also correct a mistake that appears in the literature in the equation that gives the gravitational wave amplitude at the torque balance (Abbott et al. 2017b, 2019a) and we re-interpret the associated latest LIGO/Virgo results in light of this.

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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