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arXiv 2006.16153gr-qcastro-ph.HE
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测量非对称紧双星的进动

Measuring precession in asymmetric compact binaries

Geraint Pratten, Patricia Schmidt, Riccardo Buscicchio, Lucy M. Thomas

摘要:

对合并的紧密双星的引力波观测是精确测量物体质量和自旋的关键。由自旋与轨道角动量不一致引起的广义相对论性进动被认为是确定双星形成历史和环境的关键示踪剂,它也改善了质量估计-因此其测量具有广泛的影响。岁差在发射的引力波信号中留下了一个特征性的签名,这在质量高度不等的双星中更加明显。最近对GW 190412和GW 190814的观测证实了这种非对称致密双星的存在。在这里,我们进行了一个系统的研究,以评估在测量高质量比双星的引力波观测岁差的信心,我们的能力,以测量质量较轻的同伴在中子星-黑洞型系统。使用贝叶斯模型选择,我们表明,进动可以果断地确定低质量的质量比低$1:3$和轻度旋进自旋幅度$\lesssim 0.4$,即使在系统的波形误差的存在下,低质量的二进制文件。

英文摘要:

Gravitational-wave observations of merging compact binaries hold the key to precision measurements of the objects' masses and spins. General-relativistic precession, caused by spins misaligned with the orbital angular momentum, is considered a crucial tracer for determining the binary's formation history and environment, and it also improves mass estimates -- its measurement is therefore of particular interest with wide-ranging implications. Precession leaves a characteristic signature in the emitted gravitational-wave signal that is even more pronounced in binaries with highly unequal masses. The recent observations of GW190412 and GW190814 have confirmed the existence of such asymmetric compact binaries. Here, we perform a systematic study to assess the confidence in measuring precession in gravitational-wave observations of high mass ratio binaries and, our ability to measure the mass of the lighter companion in neutron star -- black hole type systems. Using Bayesian model selection, we show that precession can be decisively identified for low-mass binaries with mass ratios as low as $1:3$ and mildly precessing spins with magnitudes $\lesssim 0.4$, even in the presence of systematic waveform errors.

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