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arXiv 1702.02137astro-ph.EP
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高偏心率下的平均运动共振:2:1和3:2内共振

Mean motion resonances at high eccentricities: the 2:1 and the 3:2 interior resonances

Xianyu Wang, Renu Malhotra

摘要:

平均运动共振(MMR)在行星系的形成和演化过程中起着重要作用,对太阳系内行星和小行星以及太阳系外行星系的轨道性质和分布有重要影响。大多数以前的理论分析都集中在低到中等偏心率制度,但随着高偏心率共振小行星,甚至系外行星的新发现,有越来越多的动机来检查在高偏心率制度的MMR。在这里,我们报告的高偏心率制度的金属磁共振在圆形平面限制性三体问题的研究。非微扰数值分析的2:1和3:2的内部共振进行了广泛的二次到一次的质量比,并为广泛的偏心率的测试粒子。利用截面法研究了共振态附近的相空间结构。我们确定在相空间中的过渡在某些关键的偏心率相关的几何形状的共振轨道,新的稳定的天平动区出现在高偏心率的天平动中心从那些在低偏心率。我们提出了新的结果的质量和偏心率依赖的共振天平动中心和它们的宽度在半长轴。我们的研究结果表明,MMR具有相当大的天平动区在高偏心率,在较低的偏心率。

英文摘要:

Mean motion resonances [MMRs] play an important role in the formation and evolution of planetary systems and have significantly influenced the orbital properties and distribution of planets and minor planets in the solar system as well as exo-planetary systems. Most previous theoretical analyses have focused on the low-to-moderate eccentricity regime, but with new discoveries of high eccentricity resonant minor planets and even exoplanets, there is increasing motivation to examine MMRs in the high eccentricity regime. Here we report on a study of the high eccentricity regime of MMRs in the circular planar restricted three-body problem. Non-perturbative numerical analyses of the 2:1 and the 3:2 interior resonances are carried out for a wide range of secondary-to-primary mass ratio, and for a wide range of eccentricity of the test particle. The surface-of-section technique is used to study the phase space structure near resonances. We identify transitions in phase space at certain critical eccentricities related to the geometry of resonant orbits; new stable libration zones appear at high eccentricity at libration centers shifted from those at low eccentricities. We present novel results on the mass and eccentricity dependence of the resonance libration centers and their widths in semi-major axis. Our results show that MMRs have sizable libration zones at high eccentricities, comparable to those at lower eccentricities.

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