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arXiv 1704.03332astro-ph.EP
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近轨道上物体之间的长期共振II:不规则卫星的逆轨道和逆轨道

Secular resonances between bodies on close orbits II: prograde and retrograde orbits for irregular satellites

Daohai Li, Apostolos A. Christou

摘要:

在扩展李和Christou(Celest Mech Dyn Astron 125:133-160,2016)(论文I)中近轨道之间的四个长期共振的分析时,我们推广了半分析模型,使其适用于两个区域中共振之间的一对一映射的逆轨道和逆行轨道。我们提出的一般形式的临界角是一个线性组合的拱点和节点之间的差异的两个轨道$ b_1 Δ\varpi + b_2 ΔΩ$,形成一个长期的共振,其中研究的论文我是最强的。在物理和轨道参数与木星上的不规则卫星Himalia和土星上的Phoebe相似的大质量卫星的轨道附近的测试表明,相空间的$> 20\%$和$> 40\%$分别受到这些共振的影响。共振的存活性是使用完整的牛顿运动方程的数值积分来确认的。我们观察到与$b_1+|b_2|\le 3$的最低阶共振持续存在,而甚至更高阶的共振,直到$b_1+|b_2|\ge 7$,仍然存在。根据质量,在这些长期共振中捕获集成测试粒子的$10\%-60\%$之间,与半分析模型中的相空间分析一致。

英文摘要:

In extending the analysis of the four secular resonances between close orbits in Li and Christou (Celest Mech Dyn Astron 125:133-160, 2016) (Paper I), we generalise the semianalytical model so that it applies to both prograde and retrograde orbits with a one to one map between the resonances in the two regimes. We propose the general form of the critical angle to be a linear combination of apsidal and nodal differences between the two orbits $ b_1 Δ\varpi + b_2 ΔΩ$, forming a collection of secular resonances in which the ones studied in Paper I are among the strongest. Test of the model in the orbital vicinity of massive satellites with physical and orbital parameters similar to those of the irregular satellites Himalia at Jupiter and Phoebe at Saturn shows that $> 20\%$ and $> 40\%$ of phase space is affected by these resonances, respectively. The survivability of the resonances is confirmed using numerical integration of the full Newtonian equations of motion. We observe that the lowest order resonances with $b_1+|b_2|\le 3$ persist, while even higher order resonances, up to $b_1+|b_2|\ge 7$, survive. Depending on the mass, between $10\%-60\%$ of the integrated test particles are captured in these secular resonances, in agreement with the phase space analysis in the semianalytical model.

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