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arXiv 0906.4574astro-ph.EP
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主小行星带行星迁移的记录

A record of planet migration in the Main Asteroid Belt

David A. Minton, Renu Malhotra

摘要:

主要的小行星带位于火星和木星的轨道之间,但该区域并不均匀地充满了小行星。在小行星分布的不同位置有一些空隙,称为柯克伍德空隙,这些空隙与巨行星的轨道共振有关;放置在这些位置的小行星遵循混乱的轨道并逃离小行星带。在这里,我们表明,所观察到的分布的主带小行星并不均匀,即使是动态稳定的年龄超过太阳系的那些地区。我们发现了一种小行星过度消耗的模式,特别是在柯克伍德间隙的外部,与5:2,7:3和2:1木星共振有关。这些特征在太阳系目前的结构中不能用行星摄动来解释,但与约40亿年前木星和土星迁移期间引力共振扫过而产生的小行星动力抛射是一致的。

英文摘要:

The main asteroid belt lies between the orbits of Mars and Jupiter, but the region is not uniformly filled with asteroids. There are gaps, known as the Kirkwood gaps, in the asteroid distribution in distinct locations that are associated with orbital resonances with the giant planets; asteroids placed in these locations follow chaotic orbits and escape from the asteroid belt. Here we show that the observed distribution of main belt asteroids does not fill uniformly even those regions that are dynamically stable over the age of the solar system. We find a pattern of excess depletion of asteroids, particularly just outward of the Kirkwood Gaps associated with the 5:2, the 7:3, and the 2:1 jovian resonances. These features are not accounted for by planetary perturbations in the current structure of the solar system, but are consistent with dynamical ejection of asteroids by the sweeping of gravitational resonances during the migration of Jupiter and Saturn ~4 gigayears ago.

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