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arXiv 2108.08490astro-ph.HEgr-qc
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中子星$-$中子星和中子星$-$黑洞合并:多波段观测和早期观测

Neutron Star$-$Neutron Star and Neutron Star$-$Black Hole Mergers: Multiband Observations and Early Warnings

Chang Liu, Lijing Shao

摘要:

中子星双星系统和中子星-黑洞系统的引力波探测为研究极端条件下致密物质的性质和高能天体物理过程提供了新的视角。然而,目前有关NS状态方程(EoS)的信息是非常有限的精度提取。与此同时,在GW 170817旁边偶然发现的$γ$射线暴的丰硕成果表明了预警警报的必要性。通过空间和地面的GW联合探测可以实现对物质效应和天空位置的精确测量。在我们的工作中,基于两个例子,GW 170817和GW 200105,我们使用Fisher信息矩阵分析,研究多波段之间的协同效应的星载decihertz GW探测器和地面的爱因斯坦望远镜(ET)。我们特别关注的参数有关的自旋诱导四极矩,潮汐变形,和天空的本地化。我们证明,(i)只有在多波段观测的帮助下,我们才能约束四极参数;和(ii)与包括分赫兹GW探测器,潮汐变形的误差将小几倍,这表明可以排除更多的EOS;(iii)与包括ET,天空定位提高了约一个数量级。此外,我们系统地比较了不同的限制,从四个计划的分贝探测器,并采用两种广泛使用的波形模型。

英文摘要:

The detections of gravitational waves (GWs) from binary neutron star (BNS) systems and neutron star--black hole (NSBH) systems provide new insights into dense matter properties in extreme conditions and associated high-energy astrophysical processes. However, currently information about NS equation of state (EoS) is extracted with very limited precision. Meanwhile, the fruitful results from the serendipitous discovery of the $γ$-ray burst alongside GW170817 show the necessity of early warning alerts. Accurate measurements of the matter effects and sky location could be achieved by joint GW detection from space and ground. In our work, based on two example cases, GW170817 and GW200105, we use the Fisher information matrix analysis to investigate the multiband synergy between the space-borne decihertz GW detectors and the ground-based Einstein Telescope (ET). We specially focus on the parameters pertaining to spin-induced quadrupole moment, tidal deformability, and sky localization. We demonstrate that, (i) only with the help of multiband observations can we constrain the quadrupole parameter; and (ii) with the inclusion of decihertz GW detectors, the errors of tidal deformability would be a few times smaller, indicating that many more EoSs could be excluded; (iii) with the inclusion of ET, the sky localization improves by about an order of magnitude. Furthermore, we have systematically compared the different limits from four planned decihertz detectors and adopting two widely used waveform models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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