论文标题
测量不对称紧凑型二进制
Measuring precession in asymmetric compact binaries
论文作者
论文摘要
合并紧凑型二进制文件的重力波观测是对物体质量和旋转精确测量的关键。由旋转与轨道角动量未对准的旋转引起的一般相关性进动被认为是确定二进制的形成历史和环境的关键示踪剂，并且还改善了质量估计 - 因此，其测量值特别感兴趣，具有广泛范围的含义。在发射的重力波信号中留下一个特征性的特征，在具有高度不平等的二进制物中更为明显。 GW190412和GW190814最近的观察结果证实了这种不对称的紧凑型二进制文件的存在。在这里，我们进行了一项系统的研究，以评估测量高质量比二进制的重力波观测的置信度，以及我们测量中子星中较轻伴侣的质量的能力 - 黑洞类型系统。使用贝叶斯模型选择，我们表明，对于质量比低至$ 1：3 $的低质量二进制文件，可以果断地识别前进，即使在存在系统的波形误差的情况下，质量比$ \ lyssim 0.4 $的轻度进取的旋转。
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.
