木星早期撞击：内小行星带的星子侵蚀
Jovian Early Bombardment: planetesimal erosion in the inner asteroid belt
摘要：
小行星带是了解太阳系历史的一扇敞开的窗户，因为它保存了其形成过程和长期演化的记录。今天小行星的祖先形成于太阳星云，几乎与巨行星同时代。产生第一代小行星的实际过程是不确定的，在很大程度上取决于太阳星云的物理特性，不同的设想产生了非常不同的初始大小-频率分布。在这项工作中，我们调查的影响，木星的形成，可能是第一个巨大的行星形成的原始小行星带的演变。木星的形成引发了一段短暂但强烈的原始撞击，这是以前无法解释的，这导致了小行星带早期碰撞演化的增强。我们的研究结果表明，这种木星早期轰击造成的侵蚀或破坏的机构小于一个阈值大小，这强烈依赖于原始星子的大小频率分布。如果小行星带主要是直径小于100公里的微行星，那么原始撞击就会造成直径小于200公里的天体被侵蚀。如果小行星带被较大的星子所控制，撞击将导致500公里大的天体被摧毁。
英文摘要：
The asteroid belt is an open window on the history of the Solar System, as it preserves records of both its formation process and its secular evolution. The progenitors of the present-day asteroids formed in the Solar Nebula almost contemporary to the giant planets. The actual process producing the first generation of asteroids is uncertain, strongly depending on the physical characteristics of the Solar Nebula, and the different scenarios produce very diverse initial size-frequency distributions. In this work we investigate the implications of the formation of Jupiter, plausibly the first giant planet to form, on the evolution of the primordial asteroid belt. The formation of Jupiter triggered a short but intense period of primordial bombardment, previously unaccounted for, which caused an early phase of enhanced collisional evolution in the asteroid belt. Our results indicate that this Jovian Early Bombardment caused the erosion or the disruption of bodies smaller than a threshold size, which strongly depends on the size-frequency distribution of the primordial planetesimals. If the asteroid belt was dominated by planetesimals less than 100 km in diameter, the primordial bombardment would have caused the erosion of bodies smaller than 200 km in diameter. If the asteroid belt was instead dominated by larger planetesimals, the bombardment would have resulted in the destruction of bodies as big as 500 km.
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