通过撞击产生的卫星观测土卫八的脊形成和反旋
Ridge Formation and De-Spinning of Iapetus via an Impact-Generated Satellite
摘要：
我们提出了一个方案，建设赤道脊和去旋转土卫八通过撞击产生的磁盘和卫星。这种撞击将碎片送入轨道，在洛希极限内形成一个环，在外面形成一颗卫星。这颗卫星迅速将环物质推到土卫八的表面，然后自己潮汐地向外发展，从而帮助土卫八去旋转。这种情况下，土卫八的自转速度比土星单独作用时快一个数量级，几乎与其内部地球物理演化无关。最终，卫星被土星从轨道上剥离。所需的卫星和撞击物质量范围与估计的土卫八撞击历史相符。
英文摘要：
We present a scenario for building the equatorial ridge and de-spinning Iapetus through an impact-generated disk and satellite. This impact puts debris into orbit, forming a ring inside the Roche limit and a satellite outside. This satellite rapidly pushes the ring material down to the surface of Iapetus, and then itself tidally evolves outward, thereby helping to de-spin Iapetus. This scenario can de-spin Iapetus an order of magnitude faster than when tides due to Saturn act alone, almost independently of its interior geophysical evolution. Eventually, the satellite is stripped from its orbit by Saturn. The range of satellite and impactor masses required is compatible with the estimated impact history of Iapetus.
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。
