Predicting gravitational wave signals from BPASS White Dwarf Binary and Black Hole Binary populations of a Milky Way-like galaxy model for LISA

IF 4.7 3区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
P Tang, J J Eldridge, R Meyer, A Lamberts, G Boileau, W G J van Zeist
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Abstract

Galactic white dwarf binaries (WDBs) and black hole binaries (BHBs) will be gravitational wave (GW) sources for LISA. Their detection will provide insights into binary evolution and the evolution of our Galaxy through cosmic history. Here, we make predictions of the expected WDB and BHB population within our Galaxy. We combine predictions of the compact remnant binary populations expected by stellar evolution from the detailed Binary Population and Spectral Synthesis (BPASS) code, with a Milky Way analogue galaxy model from the Feedback In Realistic Environment (FIRE) simulations. We use PhenomA and legwork to simulate LISA observations. Both packages make similar predictions that on average four Galactic BHBs and 673 Galactic WDBs are above the signal-to-noise ratio (SNR) threshold of 7 after a four-year mission. We compare these predictions to earlier results using the Binary Star Evolution (BSE) code with the same FIRE model galaxy. We find that BPASS predicts a few more LISA observable Galactic BHBs and a twentieth of the Galactic WDBs. The differences are due to the different physical assumptions that have gone into the binary evolution calculations. These results indicate that the expected population of compact binaries that LISA will detect depends very sensitively on the binary population synthesis models used and thus observations of the LISA population will provide tight constraints on our modelling of binary stars. Finally, from our synthetic populations we have created mock LISA signals that can be used to test and refine data processing methods of the eventual LISA observations.
为 LISA 预测类似银河系模型的 BPASS 白矮星双星和黑洞双星群体的引力波信号
银河系白矮星双星(WDBs)和黑洞双星(BHBs)将成为 LISA 的引力波(GW)源。对它们的探测将有助于深入了解双星演化和我们银河系在宇宙历史中的演变。在这里,我们对银河系内预期的 WDB 和 BHB 数量进行了预测。我们将详细的双星种群和光谱合成(BPASS)代码对恒星演化所预期的紧凑残余双星种群的预测与现实环境反馈(FIRE)模拟中的银河系模拟模型结合起来。我们使用 PhenomA 和 legwork 模拟 LISA 观测。两个软件包都做出了类似的预测,即在四年的任务之后,平均有四个银河系黑洞和673个银河系WDB超过信噪比(SNR)阈值7。我们将这些预测结果与早先使用双星演化(BSE)代码和相同的FIRE模型星系得出的结果进行了比较。我们发现,BPASS 预测出了更多的 LISA 可观测到的银河 BHB 和二十分之一的银河 WDB。这些差异是由于双星演化计算中的物理假设不同造成的。这些结果表明,LISA 将探测到的紧凑双星的预期星群非常敏感地取决于所使用的双星星群合成模型,因此对 LISA 星群的观测将为我们的双星建模提供严格的约束。最后,我们根据合成星群创建了模拟 LISA 信号,可用于测试和改进最终 LISA 观测的数据处理方法。
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来源期刊
CiteScore
9.10
自引率
37.50%
发文量
3198
审稿时长
3 months
期刊介绍: Monthly Notices of the Royal Astronomical Society is one of the world''s leading primary research journals in astronomy and astrophysics, as well as one of the longest established. It publishes the results of original research in positional and dynamical astronomy, astrophysics, radio astronomy, cosmology, space research and the design of astronomical instruments.
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