arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.07889astro-ph.HEgr-qc
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科学与TianQin天文台:银河系双白矮星双星的初步结果

Science with the TianQin Observatory: Preliminary results on Galactic double white dwarf binaries

Shun-Jia Huang, Yi-Ming Hu, Valeriya Korol, Peng-Cheng Li, Zheng-Cheng Liang, Yang Lu, Hai-Tian Wang, Shenghua Yu, Jianwei Mei

摘要:

探讨了利用天基引力波天文台天琴观测银河系双白矮星(DWD)双星的前景。在这项工作中,我们分析了目前已知的DWDs和DWDs的现实合成人口的样本,以评估保证检测的数量和任务的全部容量。我们发现,天琴可以检测到12个$\sim100$已知的DWD,这些二进制的GW信号可以在任务发射前详细建模,因此它们可以用作验证源。此外,我们估计天琴有可能探测到银河系中多达$10^4$的DWD。预计天琴将分别以$\sim10^{-7}$和$\sim0.2$的精度测量它们的轨道周期和振幅,并在天空中定位大部分(39%)探测到的种群,使其优于1度的$^2$。我们的结论是,天琴有可能通过将样本增加到2个数量级来显着提高我们对银河系DWD的认识,并将允许他们与电磁望远镜相结合进行多信使研究。我们还测试了天琴不同配置的可能性:(1)相同的任务,不同的方向,(2)两个垂直的星座组合成一个网络,以及(3)网络与欧空局领导的激光干涉仪空间天线的组合。我们发现,探测器网络的源参数的测量精度提高了1-2个数量级,与天空定位的改善是最显着的。

英文摘要:

We explore the prospects of detecting of Galactic double white dwarf (DWD) binaries with the space-based gravitational wave (GW) observatory TianQin. In this work, we analyze both a sample of currently known DWDs and a realistic synthetic population of DWDs to assess the number of guaranteed detections and the full capacity of the mission. We find that TianQin can detect 12 out of $\sim100$ known DWDs; GW signals of these binaries can be modeled in detail ahead of the mission launch, and therefore they can be used as verification sources. Besides we estimate that TianQin has potential to detect as many as $10^4$ DWDs in the Milky Way. TianQin is expected to measure their orbital periods and amplitudes with accuracies of $\sim10^{-7}$ and $\sim0.2$, respectively, and to localize on the sky a large fraction (39%) of the detected population to better than 1 deg$^2$. We conclude that TianQin has the potential to significantly advance our knowledge on Galactic DWDs by increasing the sample up to 2 orders of magnitude, and will allow their multi-messenger studies in combination with electromagnetic telescopes. We also test the possibilities of different configurations of TianQin: (1) the same mission with a different orientation, (2) two perpendicular constellations combined into a network, and (3) the combination of the network with the ESA-led Laser Interferometer Space Antenna. We find that the network of detectors boosts the accuracy on the measurement of source parameters by 1-2 orders of magnitude, with the improvement on sky localization being the most significant.

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