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arXiv 2108.11532astro-ph.EPnlin.CD
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等级行星系内部测试粒子的久期共振结构

Structures of secular resonances for inner test particles in hierarchical planetary systems

Hanlun Lei

摘要:

本文在八极近似下,采用非微扰方法研究了内实验粒子的久期共振动力学。在实践中,网络的主要长期共振产生的稳定周期轨道和相关的稳定天平动区,通过分析庞加莱表面的部分,确定家庭。通过取不同的因子$ε$($ε$度量八极项的贡献),计算了八极项对动力学结构的影响.在$ε= 0$条件下(无八极阶贡献),动力学模型是完全可积的,相空间中只存在Kozai共振.当因子$ε$不为零时,由于出现了多种久期共振,相空间中的动力学结构变得复杂。数值结果进一步表明:(a)在不同的$ε$值下,天平动中心和稳定天平动区的分布保持定性相似;(b)在低偏心率区域,由于混沌运动,Kozai共振消失;(c)在低偏心率区域,随着$ε$的增大,混沌区域增大.长期共振是许多重要动力学现象的来源,如混沌、轨道对准和轨道翻转等,因此本文的研究结果对于理解高偏心率和/或高倾角天体在分层行星系中的长期动力学行为具有重要意义。

英文摘要:

In this study, dynamics of secular resonances for inner test particles are investigated under the octupole-level approximation by taking non-perturbative approaches. In practice, webs of the major secular resonances are produced by identifying families of stable periodic orbits and the associated stable libration zones are obtained by analysing Poincaré surfaces of section. By taking different values of the factor $ε$ ($ε$ measures the contribution of octupole terms), the influences of the octupole-order terms upon the dynamical structures are evaluated. Under the condition of $ε= 0$ (no octupole-order contribution), the dynamical model is totally integrable and there is only Kozai resonance arising in the phase space. When the factor $ε$ is different from zero, the dynamical structure in the phase space becomes complicated due to varieties of secular resonances appearing. Numerical results further indicate that (a) distributions of libration centres and stable libration zones remain qualitatively similar with different values of $ε$, (b) Kozai resonance disappears due to the chaotic motion in the low-eccentricity region, and (c) the chaotic area arising in the low-eccentricity region increases with the factor $ε$. Secular resonances are the source of many important dynamical phenomena, such as chaos, orbit alignment and orbit flipping, and thus the results presented in this work could be useful to understand the secular dynamics for those high-eccentricity and/or high-inclination objects in hierarchical planetary systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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