Companion-driven evolution of massive stellar binaries

Companion-driven evolution of massive stellar binaries
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伴星驱动的大质量双星演化

DOI:
10.1093/mnras/stz1846
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发表时间:
2019
影响因子:
4.8
通讯作者:
Geller, Aaron M
Geller, Aaron M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Rose, Sanaea C;Naoz, Smadar;Geller, Aaron M

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至少有大质量的oba型恒星存在于双星或高阶星系中。这些系统的动态演化有助于深入了解x射线双星和引力波源等极端现象的起源。在一个这样的动力过程中,偏心Kozai-Lidov (EKL)机制,第三颗伴星改变了双星系统的长期演化。为了动态稳定性,这些三重系统必须具有层次结构。我们探索了在重大恒星演化发生之前(≤10 Myr),遥远的第三伴星的引力扰动对大质量双星轨道构型的影响。我们包括潮汐耗散和广义相对论进动。通过大规模(总共38000)蒙特卡罗实现的大规模分层三元组,我们描述了出生条件在最终轨道分布上的印记。具体来说,我们发现在0.1-0.7范围内的最终偏心率分布是其出生分布的一个很好的指标。此外,我们发现周期分布在宽轨道上具有相似的映射。最后,我们证明了观测到的大约10 myr年龄的大质量恒星的周期分布与EKL的演化是一致的。
At leastof massive OBA-type stars reside in binary or higher order systems. The dynamical evolution of these systems can lend insight into the origins of extreme phenomena such as X-ray binaries and gravitational wave sources. In one such dynamical process, the Eccentric Kozai–Lidov (EKL) mechanism, a third companion star alters the secular evolution of a binary system. For dynamical stability, these triple systems must have a hierarchical configuration. We explore the effects of a distant third companion’s gravitational perturbations on a massive binary’s orbital configuration before significant stellar evolution has taken place (≤10 Myr). We include tidal dissipation and general relativistic precession. With large (38 000 total) Monte Carlo realizations of massive hierarchical triples, we characterize imprints of the birth conditions on the final orbital distributions. Specifically, we find that the final eccentricity distribution over the range of 0.1–0.7 is an excellent indicator of its birth distribution. Furthermore, we find that the period distributions have a similar mapping for wide orbits. Finally, we demonstrate that the observed period distribution for approximately 10-Myr-old massive stars is consistent with EKL evolution.
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