The evolution of hierarchical triple star-systems

IF 16.281
Silvia Toonen, Adrian Hamers, Simon Portegies Zwart
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引用次数: 104

Abstract

Field stars are frequently formed in pairs, and many of these binaries are part of triples or even higher-order systems. Even though, the principles of single stellar evolution and binary evolution, have been accepted for a long time, the long-term evolution of stellar triples is poorly understood. The presence of a third star in an orbit around a binary system can significantly alter the evolution of those stars and the binary system. The rich dynamical behaviour in three-body systems can give rise to Lidov-Kozai cycles, in which the eccentricity of the inner orbit and the inclination between the inner and outer orbit vary periodically. In turn, this can lead to an enhancement of tidal effects (tidal friction), gravitational-wave emission and stellar interactions such as mass transfer and collisions. The lack of a self-consistent treatment of triple evolution, including both three-body dynamics as well as stellar evolution, hinders the systematic study and general understanding of the long-term evolution of triple systems. In this paper, we aim to address some of these hiatus, by discussing the dominant physical processes of hierarchical triple evolution, and presenting heuristic recipes for these processes. To improve our understanding on hierarchical stellar triples, these descriptions are implemented in a public source code TrES, which combines three-body dynamics (based on the secular approach) with stellar evolution and their mutual influences. Note that modelling through a phase of stable mass transfer in an eccentric orbit is currently not implemented in TrES, but can be implemented with the appropriate methodology at a later stage.

Abstract Image

分层三星系统的演化
野星通常是成对形成的,许多这样的双星是三元组甚至高阶系统的一部分。尽管单星演化和双星演化的原理已经被接受了很长时间,但三联星的长期演化却鲜为人知。在双星系统的轨道上存在第三颗恒星可以显著地改变这些恒星和双星系统的演化。在三体系统中丰富的动力学行为可以产生Lidov-Kozai周期,其中内轨道的偏心率和内外轨道之间的倾角周期性变化。反过来,这可能导致潮汐效应(潮汐摩擦)、引力波发射和恒星相互作用(如质量传递和碰撞)的增强。缺乏对三重演化的自一致处理,包括三体动力学和恒星演化,阻碍了对三重系统长期演化的系统研究和普遍理解。在本文中,我们的目标是通过讨论层次三重进化的主要物理过程,并提出这些过程的启发式配方,来解决其中的一些中断。为了提高我们对分层恒星三元组的理解,这些描述在一个公共源代码TrES中实现,该源代码将三体动力学(基于世俗方法)与恒星演化及其相互影响相结合。请注意,通过偏心轨道稳定传质阶段的建模目前尚未在TrES中实现,但可以在稍后阶段用适当的方法实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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期刊介绍: Computational Astrophysics and Cosmology (CompAC) is now closed and no longer accepting submissions. However, we would like to assure you that Springer will maintain an archive of all articles published in CompAC, ensuring their accessibility through SpringerLink's comprehensive search functionality.
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