Dynamical evolution of the Prometheus–Pandora system
Dynamical evolution of the Prometheus–Pandora system
复制标题
普罗米修斯-潘多拉系统的动态演化
DOI：
10.1046/j.1365-8711.2001.04128.x
复制
发表时间：
2001
影响因子：
4.8
通讯作者：
B. Sicardy
中科院分区：
文献类型：
--
作者：
F. Poulet;B. Sicardy
土星内部的卫星系统充满了许多共振。它的结构应该受到潮汐作用力的强烈影响，潮汐作用力推动卫星通过几个轨道-轨道共振。用解析和数值方法研究了这些卫星的演化过程。我们证明，如果普罗米修斯和潘多拉这对卫星的轨道在没有捕获的情况下会聚成共振，那么这对卫星的寿命特别短。潘多拉与普罗米修斯的共鸣使这对夫妇的寿命增加了几十迈尔。然而，系统的共振没有得到很好的分离，捕获导致了混沌运动。二次共振也会破坏共振构型。在所有情况下，这两颗卫星会合的轨道导致了近距离相遇。文中还讨论了土星环起源的含义。
The system of Saturn's inner satellites is saturated with many resonances. Its structure should be strongly affected by tidal forces driving the satellites through several orbit–orbit resonances. The evolution of these satellites is investigated using analytic and numerical methods. We show that the pair of satellites Prometheus and Pandora has a particularly short lifetime (<20 Myr) if the orbits of the satellites converge without capture into a resonance. The capture of Pandora into a resonance with Prometheus increases the lifetime of the couple by a few tens of Myr. However, resonances of the system are not well separated, and capture results in a chaotic motion. Secondary resonances also disrupt the resonant configurations. In all cases, the converging orbits of these two satellites result in a close encounter. The implications for the origin of Saturn's rings are discussed.