Probing neutron stars with the full premerger and postmerger gravitational wave signal from binary coalescences
Probing neutron stars with the full premerger and postmerger gravitational wave signal from binary coalescences
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DOI：
10.1103/physrevd.105.104019
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发表时间：
2022-02
影响因子：
5
通讯作者：
M. Wijngaarden;K. Chatziioannou;A. Bauswein;J. Clark;N. Cornish
中科院分区：
文献类型：
--
作者：
M. Wijngaarden;K. Chatziioannou;A. Bauswein;J. Clark;N. Cornish
两颗中子星合并时发出的引力波信号携带着恒星内部结构的信息。在漫长的螺旋上升阶段，观测到的主要物质是双星组件之间的潮汐相互作用，这种效应可以用广义相对论的紧致双星解进行参数化建模。在双星合并之后，主要的观测对象是残余物的频率模式，最常见的是产生一个只有通过数值模拟才能获得的短持续时间信号。复杂的形态和相关频率中检测器灵敏度的降低目前阻碍了合并后信号的检测，并促使对合并前和合并后数据进行单独分析。然而，计划和正在进行的探测器改进可能很快就会使合并后的信号触手可及。在这项研究中，我们的目标是整个合并前和合并后的信号，而无需在二进制合并的人工分离。我们构建了一个混合分析模型的inspiral与模板的基础上分析计算和校准的数值相关性和合并后的信号与灵活的形态独立的分析。将这种分析应用于GW170817，我们发现，正如预期的那样，合并后的信号仍然未被检测到。我们进一步研究模拟信号，发现我们可以重建完整的信号，同时估计合并前的潮汐变形和合并后的信号频率内容。我们的分析使我们能够研究中子星星物理使用所有可用的数据，并直接测试合并前和合并后的信号的一致性，从而探测的影响，如强子夸克相变的开始。
The gravitational wave signal emitted during the coalescence of two neutron stars carries information about the stars' internal structure. During the long inspiral phase the main matter observable is the tidal interaction between the binary components, an effect that can be parametrically modeled with compact-binary solutions to General Relativity. After the binary merger the main observable is frequency modes of the remnant, most commonly giving rise to a short-duration signal accessible only through numerical simulations. The complicated morphology and the decreasing detector sensitivity in the relevant frequencies currently hinder detection of the post-merger signal and motivate separate analyses for the pre-merger and post-merger data. However, planned and ongoing detector improvements could soon put the post-merger signal within reach. In this study we target the whole pre-merger and post-merger signal without an artificial separation at the binary merger. We construct a hybrid analysis that models the inspiral with templates based on analytical calculations and calibrated to numerical relativity and the post-merger signal with a flexible morphology-independent analysis. Applying this analysis to GW170817 we find, as expected, that the post-merger signal remains undetected. We further study simulated signals and find that we can reconstruct the full signal and simultaneously estimate both the pre-merger tidal deformation and the post-merger signal frequency content. Our analysis allows us to study neutron star physics using all the data available and directly test the pre-merger and post-merger signal for consistency thus probing effects such as the onset of the hadron-quark phase transition.