arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1110.2802astro-ph.SR
收藏

通过偏心双白矮星双星的拱心岁差限制白矮星质量

Constraining White Dwarf Masses Via Apsidal Precession in Eccentric Double White Dwarf Binaries

Francesca Valsecchi, Will M. Farr, Bart Willems, Christopher J. Deloye andVicky Kalogera

摘要:

银河系短周期双白矮星(DWD)是下一代空间干涉仪的引力波(GW)源。在这里,我们调查的可能性约束的白矮星(WD)的性质,通过测量拱点进动的偏心双星。我们分析了广义相对论(GR),潮汐和旋转的贡献,通过使用详细的他WD模型拱点进动。我们发现,拱点岁差可以导致一个可检测的转变,在发出的GW信号,效果更强(弱)的二进制主机热(冷)WD。我们发现,在热(冷)DWDs潮汐占主导地位的轨道频率以上的岁差~0.01兆赫(~1兆赫)。分析这些源的拱点进动,只考虑GR可能会导致组件质量的极端高估。最后,我们推导出一个关系,关系到冷WD组件的半径和拱点进动常数,它们的质量,因此允许潮汐被用作一个额外的质量测量工具。

英文摘要:

Galactic short period double white dwarfs (DWD) are guaranteed gravitational wave (GW) sources for the next generation of space-based interferometers sensitive to low-frequency GWs (10^{-4}- 1 Hz). Here we investigate the possibility of constraining the white dwarf (WD) properties through measurements of apsidal precession in eccentric binaries. We analyze the general relativistic (GR), tidal, and rotational contributions to apsidal precession by using detailed He WD models. We find that apsidal precession can lead to a detectable shift in the emitted GW signal, the effect being stronger (weaker) for binaries hosting hot (cool) WDs. We find that in hot (cool) DWDs tides dominate the precession at orbital frequencies above ~0.01 mHz (~1 mHz). Analyzing the apsidal precession of these sources only accounting for GR would potentially lead to an extreme overestimate of the component masses. Finally, we derive a relation that ties the radius and apsidal precession constant of cool WD components to their masses, therefore allowing tides to be used as an additional mass measurement tool.

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。

↑