The Hill stability of low mass binaries in hierarchical triple systems

The Hill stability of low mass binaries in hierarchical triple systems
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多级三重系统中低质量双星的希尔稳定性

DOI:
10.1007/s10569-010-9276-4
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发表时间:
2010-05
影响因子:
1.6
通讯作者:
Sun, Yi-Sui
Sun, Yi-Sui
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li, Jian;Fu, Yan-Ning;Sun, Yi-Sui

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研究了在倾斜轨道上运动的大质量第三体存在时低质量双星系统的Hill稳定性。结果表明,当第三体在近圆轨道上时,Hill稳定区随双星/第三体质量比的增大和倾角i的减小而扩大。这种依赖性随着第三体相对于双星重心的偏心率(e2)的增加而迅速减小。事实上,如果e 2不是非常小,Hill稳定区可以近似地表示为一个封闭的形式,当i = 90°时,对于足够小质量的双星,Hill稳定区随着e 2 as的增加而缩小。我们的分析结果,然后应用到所观察到的三重星星系统和柯伊伯带双星。
The Hill stability of the low mass binary system in the presence of a massive third body moving on a wider inclined orbit is investigated analytically. It is found that, in the case of the third body being on a nearly circular orbit, the region of Hill stability expands as the binary/third body mass ratio increases and the inclination (i) decreases. Thisi-dependence decreases very quickly with increasing eccentricity (e2) of the third body relative to the binary barycentre. In fact, ife2is not extremely small, the Hill stable region can be approximately expressed in a closed form by settingi= 90°, and it contracts with increasinge2asfor sufficiently low mass binary. Our analytic results are then applied to the observed triple star systems and the Kuiper belt binaries.
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