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arXiv 0903.3434astro-ph.EP
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火星卫星起源于双星小行星分离

Origin of Martian Moons from Binary Asteroid Dissociation

Geoffrey A. Landis

摘要:

火星卫星火卫二和火卫一的起源是有争议的。关于它们起源的一个假设是它们是被捕获的小行星,但这一机制需要一个非常稠密的火星大气层,而太阳轨道上的小行星可以释放足够的轨道能量被捕获到火星轨道的机制还没有得到很好的解释。自从伽利略号空间探测器发现小行星Ida有一颗卫星“Dactyl”以来,已经发现许多小行星的轨道上有较小的小行星。小行星卫星的存在为捕获火星卫星(以及外行星的小卫星)提供了一种机制。当一颗双星小行星靠近一颗行星时,潮汐力会将月球从小行星上剥离。根据相位,小行星可以被捕获。显然,同样的过程也可以用来解释太阳系中任何一颗小卫星的起源。

英文摘要:

The origin of the Martian moons Deimos and Phobos is controversial. One hypothesis for their origin is that they are captured asteroids, but the mechanism requires an extremely dense martian atmosphere, and the mechanism by which an asteroid in solar orbit could shed sufficient orbital energy to be captured into Mars orbit has not been well elucidated. Since the discovery by the space probe Galileo that the asteroid Ida has a moon "Dactyl", a significant number of asteroids have been discovered to have smaller asteroids in orbit about them. The existence of asteroid moons provides a mechanism for the capture of the Martian moons (and the small moons of the outer planets). When a binary asteroid makes a close approach to a planet, tidal forces can strip the moon from the asteroid. Depending on the phasing, the asteroid can then be captured. Clearly, the same process can be used to explain the origin of any of the small moons in the solar system.

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。

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