Eccentric Double White Dwarfs as LISA Sources in Globular Clusters
Eccentric Double White Dwarfs as LISA Sources in Globular Clusters
复制标题
偏心双白矮星作为球状星团中的 LISA 源
DOI：
10.1086/521049
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
U. NewMexicoState
中科院分区：
文献类型：
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作者：
B. Willems;V. Kalogera;A. Vecchio;N. Ivanova;F. Rasio;J. Fregeau;U. K.BelczynskiNorthwestern;U. Birmingham;U. O. Toronto;U. NewMexicoState
我们考虑了双白矮星（DWDs）是通过球状星团中的动态相互作用形成的。这样的相互作用可以产生偏心的dwd，与预期在银河系盘中形成的完全圆形的人口形成对比。我们表明，在为期5年的激光干涉仪空间天线（LISA）任务和距离远至大麦哲伦云的距离中，至少有少数偏心DWDs可以以高于8的信噪比检测到来自偏心DWDs的多重谐波，考虑到它们的形成速率和当前星团模拟估计的典型寿命。因此，偏心率与恒星质量LISA源的关联并不像通常假设的那样只涉及中子星。由于现有和计划中的电磁观测站难以探测（偏心）DWDs， LISA可以提供球状星团中这些系统的独特动力学识别。
We consider the formation of double white dwarfs (DWDs) through dynamical interactions in globular clusters. Such interactions can give rise to eccentric DWDs, in contrast to the exclusively circular population expected to form in the Galactic disk. We show that for a 5 yr Laser Interferometer Space Antenna (LISA) mission and distances as far as the Large Magellanic Cloud, multiple harmonics from eccentric DWDs can be detected at a signal-to-noise ratio higher than 8 for at least a handful of eccentric DWDs, given their formation rate and typical lifetimes estimated from current cluster simulations. Consequently, the association of eccentricity with stellar-mass LISA sources does not uniquely involve neutron stars, as is usually assumed. Due to the difficulty of detecting (eccentric) DWDs with present and planned electromagnetic observatories, LISA could provide unique dynamical identifications of these systems in globular clusters.