Waveform systematics for binary neutron star gravitational wave signals: Effects of the point-particle baseline and tidal descriptions
Waveform systematics for binary neutron star gravitational wave signals: Effects of the point-particle baseline and tidal descriptions
复制标题
双中子星引力波信号的波形系统学：点粒子基线和潮汐描述的影响
作者：
A. Samajdar;T. Dietrich
引力波天文学已经巩固了它作为一个新的观测窗口的作用，以揭示宇宙中致密双星的性质。特别是，第一颗双星中子星GW170817的发现导致了一些科学突破，使人们有可能在超核密度下对冷物质的状态方程施加限制。这些约束和基于这些约束的所有科学结果都需要描述GW信号的准确模型，以便从测量信号中提取源特性。
在这篇文章中，我们研究了在提取源参数过程中潜在的系统偏差，使用了对点-粒子动力学和潮汐效应的不同描述。我们发现，对于所考虑的情况，质量和自旋恢复相对于所选择的波形模型几乎没有系统偏差。然而，提取的潮汐效应可能会有很强的偏差，我们通常发现后牛顿近似预测的中子星具有比数值相对论调整的模型更大的变形性和半径。值得注意的是，潮汐位相中后牛顿阶数的增加并不会导致估计性质的单调变化。
我们发现，对于强度与GW170817相似的信号，但以设计灵敏度观测，估计的潮汐参数可能相差两倍以上，这取决于所采用的波形近似式的潮汐描述。这表明当前需要开发更好的波形模型以从即将到来的GW检测中可靠地提取源特性。
Gravitational wave (GW) astronomy has consolidated its role as a new observational window to reveal the properties of compact binaries in the Universe. In particular, the discovery of the first binary neutron star coalescence, GW170817, led to a number of scientific breakthroughs as the possibility to place constraints on the equation of state of cold matter at supranuclear densities. These constraints and all scientific results based on them require accurate models describing the GW signal to extract the source properties from the measured signal.
In this article, we study potential systematic biases during the extraction of source parameters using different descriptions for both, the point-particle dynamics and tidal effects. We find that for the considered cases the mass and spin recovery show almost no systematic bias with respect to the chosen waveform model. However, the extracted tidal effects can be strongly biased, where we find generally that Post-Newtonian approximants predict neutron stars with larger deformability and radii than numerical relativity tuned models. Noteworthy, an increase in the Post-Newtonian order in the tidal phasing does not lead to a monotonic change in the estimated properties.
We find that for a signal with strength similar to GW170817, but observed with design sensitivity, the estimated tidal parameters can differ by more than a factor of two depending on the employed tidal description of the waveform approximant. This shows the current need for the development of better waveform models to extract reliably the source properties from upcoming GW detections.
影响因子：
7.9
作者：
Bauswein, Andreas;Just, Oliver;Stergioulas, Nikolaos
通讯作者：
Stergioulas, Nikolaos
影响因子：
3.5
作者：
T. Dietrich;D. Radice;S. Bernuzzi;F. Zappa;A. Perego;B. Brügmann;Swami Vivekanandji Chaurasia;R. Dudi;W. Tichy;M. Ujevic
通讯作者：
T. Dietrich;D. Radice;S. Bernuzzi;F. Zappa;A. Perego;B. Brügmann;Swami Vivekanandji Chaurasia;R. Dudi;W. Tichy;M. Ujevic
影响因子：
4.8
作者：
Coughlin, Michael W.;Dietrich, Tim;Smartt, Stephen J.
通讯作者：
Smartt, Stephen J.