Explaining why the uranian satellites have equatorial prograde orbits despite the large planetary obliquity
Explaining why the uranian satellites have equatorial prograde orbits despite the large planetary obliquity
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解释为什么尽管行星倾角很大，天王星卫星仍具有赤道顺行轨道
DOI：
10.1016/j.icarus.2012.03.025
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发表时间：
2012
期刊：
影响因子：
3.2
通讯作者：
R. Gomes
中科院分区：
文献类型：
--
作者：
A. Morbidelli;K. Tsiganis;K. Batygin;A. Crida;R. Gomes
我们表明，存在的赤道卫星是一致的碰撞倾斜的情况下，天王星。事实上，如果行星在倾斜时被一个原卫星盘包围着，并且在碰撞中暂时将一个巨大的物质环放置在行星的洛希半径内，那么原卫星盘将开始围绕行星的赤道不连贯地进动，直到比奥伯龙更远的距离。碰撞阻尼会使它坍缩成一个薄薄的赤道盘，卫星最终由此形成。卫星的轨道是倾斜的，这一事实要求天王星在最终倾斜到98°之前有一个不可忽略的初始倾斜度（与海王星相当）。
We show that the existence of prograde equatorial satellites is consistent with a collisional tilting scenario for Uranus. In fact, if the planet was surrounded by a proto-satellite disk at the time of the tilting and a massive ring of material was temporarily placed inside the Roche radius of the planet by the collision, the proto-satellite disk would have started to precess incoherently around the equator of the planet, up to a distance greater than that of Oberon. Collisional damping would then have collapsed it into a thin equatorial disk, from which the satellites eventually formed. The fact that the orbits of the satellites are prograde requires Uranus to have had a non-negligible initial obliquity (comparable to that of Neptune) before it was finally tilted to 98°.