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arXiv 2409.15230gr-qcastro-ph.GAastro-ph.SR
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从LISA银河系双白矮星双星中恢复注入的天体物理学

Recovering Injected Astrophysics from the LISA Galactic Double White Dwarf Binaries

Vera Delfavero, Katelyn Breivik, Sarah Thiele, Richard O'Shaughnessy, John G. Baker

AI总结:

本研究通过模拟双白矮星双星群体,利用贝叶斯分层推断恢复公共包层抛射效率,证明该方法可有效约束未来LISA观测中的双星形成过程。

摘要:

我们展示了在模拟的双白矮星双星群体中,成功恢复所假设的公共包层抛射效率,这些双星类似于未来LISA任务可能观测到的系统。我们使用COSMIC群体合成代码模拟双白矮星双星的形成,通过采样双星形成条件,如初始质量函数、恒星形成金属丰度、初始轨道周期和初始偏心率。这些双星被放置在m12i合成银河系类星系中,并估算其LISA仪器信噪比,同时考虑由该群体提供的银河系引力波前景。通过使用Fisher估计,我们为LISA明亮双白矮星双星(信噪比>20,引力波频率>5mHz)在引力波频率和啁啾质量方面的测量误差构建似然函数。通过对公共包层抛射效率的不同假设重复此过程,我们应用贝叶斯分层推断,以找到与基准群体模型的注入天体物理假设的最佳匹配。我们得出结论,公共包层抛射效率对双白矮星形成所涉及的质量转移过程的影响,在未来观测到的LISA群体中可能具有统计显著性,并且通过将模拟群体与未来观测群体进行比较,可以找到对双星形成的约束。

英文摘要:

We present the successful recovery of common envelope ejection efficiency assumed in a simulated population of double white dwarf binaries like those which may be observed by the future LISA mission. We simulate the formation of double white dwarf binaries by using the COSMIC population synthesis code to sample binary formation conditions such as initial mass function, metallicity of star formation, initial orbital period, and initial eccentricity. These binaries are placed in the m12i synthetic Milky-Way-like galaxy, and their signal-to-noise ratio for the LISA instrument is estimated, considering a galactic gravitational wave foreground informed by the population. Through the use of Fisher estimates, we construct a likelihood function for the measurement error of the LISA-bright DWD binaries (> 20 SNR, fGW > 5mHz), in their gravitational wave frequency (fGW) and chirp mass. By repeating this process for different assumptions of the common envelope ejection efficiency, we apply Bayesian hierarchical inference to find the best match to an injected astrophysical assumption for a fiducial population model. We conclude that the impact of common envelope ejection efficiency on the mass transfer processes involved in double white dwarf formation may be statistically relevant in the future observed LISA population, and that constraints on binary formation may be found by comparing simulated populations to a future observed population.

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