Collisional Erosion in the Primordial Edgeworth-Kuiper Belt and the Generation of the 30-50 AU Kuiper Gap
Collisional Erosion in the Primordial Edgeworth-Kuiper Belt and the Generation of the 30-50 AU Kuiper Gap
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原始埃奇沃斯-柯伊伯带的碰撞侵蚀和 30-50 天文单位柯伊伯间隙的产生
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发表时间：
1997
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影响因子：
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通讯作者：
J. Colwell
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作者：
S. Stern;J. Colwell
关于太阳系外层结构的悬而未决的问题之一是，海王星外的彗星盘和被称为太阳系埃奇沃斯-柯伊伯带（EKB）的小型行星尺度天体是如何起源并演化到目前的质量和结构的。应用EKB碰撞演化的时间相关模型，我们发现，在广泛的假设下，碰撞演化应该在太阳系历史早期就将30-50 AU区域的质量耗尽>90%，从而在海王星以外的广阔区域的表面质量密度中产生深深的疤痕或间隙，就像今天观察到的那样。动力侵蚀可能进一步加速了消耗过程。鉴于海王星在超过 50 个天文单位的范围内的动力学影响要小得多，我们的结果还表明，除非太阳星云在接近 50 个天文单位的范围内被截断，否则超过约 50 个天文单位的固体表面质量密度可能会再次增加，而且很可能会急剧增加。
One of the oustanding questions about the architecture of the outer solar system is how the trans-Neptunian disk of comets and small planet-scale objects known as the solar system's Edgeworth-Kuiper Belt (EKB) originated and evolved to its present mass and architecture. Applying a time-dependent model of collisonal evolution of the EKB, we find that under a wide range of assumptions, collisional evolution should have depleted the mass of the 30-50 AU zone by >90% early in the history of the solar system, thereby creating a deep scar or gap in the surface mass density across a wide region beyond Neptune, much like what is observed today. Dynamical erosion may have further accelerated the depletion process. Given the fact that Neptune has had far less dynamical influence beyond 50 AU, our results also suggest that unless the solar nebula was truncated near 50 AU, then surface mass density of solids somewhere beyond ~50 AU may increase again, most likely dramatically.