论文标题
测量GW170817和GW190425的偏心率
Measuring the eccentricity of GW170817 and GW190425
论文作者
论文摘要
晚期Ligo和处女座已检测到两个二元中子星星合并GW170817和GW190425。这些信号是通过匹配过滤器搜索检测到的，这些搜索假设恒星的轨道在重力波发射时已被循环。这表明它们的偏心率很低，但是尚未进行全部参数估计。我们使用重力波观测来测量GW170817和GW190425的偏心率。我们发现，GW170817和GW190425的重力波频率的偏心率为10 Hz的偏心率为0.024 $和$ e \ e \ leq 0.048 $（90％置信度）。这与现场形成的二进制文件一致，因为预计该系统将在到达Ligo-Virgo频段时将其循环到$ e \ e \ leq 10^{ - 4} $。我们的约束是两个较小的因素，即通过忽略偏心率的搜索来检测到基于GW170817的估计值。但是，我们警告说，我们发现在我们的限制上有很大的先验依赖性，这表明信号中的信息有限。我们注意到，其他用于限制二进制中子星偏心率而没有完整参数估计的技术可能会错过波形中的变性，并且对于将来的信号，使用准确的波形模板执行完整的参数估计非常重要。
Two binary neutron star mergers, GW170817 and GW190425, have been detected by Advanced LIGO and Virgo. These signals were detected by matched-filter searches that assume the star's orbit has circularized by the time their gravitational-wave emission is observable. This suggests that their eccentricity is low, but full parameter estimation of their eccentricity has not yet been performed. We use gravitational-wave observations to measure the eccentricity of GW170817 and GW190425. We find that the eccentricity at a gravitational-wave frequency of 10 Hz is $e \leq 0.024$ and $e \leq 0.048$ for GW170817 and GW190425, respectively (90% confidence). This is consistent with the binaries being formed in the field, as such systems are expected to have circularized to $e \leq 10^{-4}$ by the time they reach the LIGO-Virgo band. Our constraint is a factor of two smaller that an estimate based on GW170817 being detected by searches that neglect eccentricity. However, we caution that we find significant prior dependence in our limits, suggesting that there is limited information in the signals. We note that other techniques used to constrain binary neutron star eccentricity without full parameter estimation may miss degeneracies in the waveform, and that for future signals it will be important to perform full parameter estimation with accurate waveform templates.
