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arXiv 2008.04335astro-ph.EP
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半分层三重动力学及其在外太阳系中的应用

Mildly-Hierarchical triple dynamics and applications to the outer solar system

Hareesh Gautham Bhaskar, Gongjie Li, Sam Hadden, Matthew J. Payne, Matthew J. Holman

摘要:

三体相互作用在天体物理学中无处不在。例如,分层三元系统中的Kozai-Lidov振荡已经被广泛研究并应用于广泛的天体物理系统。然而,轻度层次三元组也起着重要的作用,但他们很少探索。在这项工作中,我们考虑的长期动力学的测试粒子在一个温和的层次结构。我们发现的长期近似是可靠的限制,目前的共振和混沌区域使用表面的部分,并表征区域的相空间,允许大的偏心率和倾斜度的变化。最后,我们将长期结果应用到外太阳系。我们重点研究了在一颗可能的外行星(Planet-9)扰动下极端海王星外天体(eTNO)的分布,发现除了低倾角的Planet-9外,极轨或逆轨的Planet-9也可能产生eTNO的近心聚集,而极轨的eTNO倾角分布更广。

英文摘要:

Three-body interactions are ubiquitous in astrophysics. For instance, Kozai-Lidov oscillations in hierarchical triple systems have been studied extensively and applied to a wide range of astrophysical systems. However, mildly-hierarchical triples also play an important role, but they are less explored. In this work we consider the secular dynamics of a test particle in a mildly-hierarchical configuration. We find the limit within which the secular approximation is reliable, present resonances and chaotic regions using surface of sections, and characterize regions of phase space that allow large eccentricity and inclination variations. Finally, we apply the secular results to the outer solar system. We focus on the distribution of extreme trans-neptunian objects (eTNOs) under the perturbation of a possible outer planet (Planet-9), and find that in addition to a low inclination Planet-9, a polar or a counter-orbiting one could also produce pericenter clustering of eTNOs, while the polar one leads to a wider spread of eTNO inclinations.

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