All-sky search for long-duration gravitational-wave transients in the second Advanced LIGO observing run
All-sky search for long-duration gravitational-wave transients in the second Advanced LIGO observing run
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DOI：
10.1103/physrevd.99.104033
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发表时间：
2019-05-14
影响因子：
5
通讯作者：
Zweizig, J.
中科院分区：
文献类型：
--
作者：
Abbott, B. P.;Abbott, R.;Zweizig, J.
我们提出的搜索结果的长期引力波瞬变的数据从先进的LIGO第二次观测运行，我们搜索的引力波瞬变的2-500秒的持续时间在24-2048 Hz的频带与最小的假设信号特性，如波形形态，偏振，天空的位置或发生的时间。这些搜索算法所涵盖的信号家族包括中子星上的回退吸积，旋转黑洞周围最内层稳定圆轨道波的宽带啁啾，偏心吸气合并振铃紧凑的二元聚结波形和其他模型。第二次观测运行在2016年11月至2017年8月之间总计约118.3天的重合数据。除了已经报道的中子星星合并GW 170817外，我们在搜索的参数空间内没有发现任何重大事件。因此，我们报告在50%的效率的应变振幅的平方根和h（rss）的灵敏度限制。这些灵敏度估计相对于第一次观测运行是一个改进，也是用一组扩大的引力波瞬态波形来完成的。总体而言，对于毫秒磁星模型，最佳搜索灵敏度为h（rss）（50%）= 2.7 x 10（-22）Hz（-1/2）。对于偏心致密二进制聚结信号，搜索灵敏度达到h（rss）（50%）= 9.6 × 10（-22）Hz（-1/2）。
We present the results of a search for long-duration gravitational-wave transients in the data from the Advanced LIGO second observation run; we search for gravitational-wave transients of 2-500 s duration in the 24-2048 Hz frequency band with minimal assumptions about signal properties such as waveform morphologies, polarization, sky location or time of occurrence. Signal families covered by these search algorithms include fallback accretion onto neutron stars, broadband chirps from innermost stable circular orbit waves around rotating black holes, eccentric inspiral-merger-ringdown compact binary coalescence waveforms, and other models. The second observation run totals about 118.3 days of coincident data between November 2016 and August 2017. We find no significant events within the parameter space that we searched, apart from the already-reported binary neutron star merger GW170817. We thus report sensitivity limits on the root-sum-square strain amplitude h(rss) at 50% efficiency. These sensitivity estimates are an improvement relative to the first observing run and also done with an enlarged set of gravitational-wave transient waveforms. Overall, the best search sensitivity is h(rss)(50%) = 2.7 x 10(-22) Hz(-1/2) for a millisecond magnetar model. For eccentric compact binary coalescence signals, the search sensitivity reaches h(rss)(50%) = 9.6 x 10(-22) Hz(-1/2).