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arXiv 0903.0923astro-ph.EP
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对柯伊伯带和木星特洛伊星等分布的思考

Considerations on the magnitude distributions of the Kuiper belt and of the Jupiter Trojans

Morbidelli Alessandro, Harold F. Levison, William Bottke, Luke Dones, David Nesvorny

摘要:

通过研究柯伊伯带中冷、热星群和木星特洛伊星的绝对星等(H)分布(以下简称HD),我们发现特洛伊星是从原始外海王星微行星盘的外部捕获的证据。我们开发了一个草图模型的硬盘的内部和外部的磁盘是一致的观察到的分布和动态演化的情况下被称为“尼斯模型”。这使我们预测,热种群的HD应该具有与冷种群的HD相同的斜率(6.5 < H < 9),两者都与特洛伊人的HD的斜率一样陡。目前的数据部分支持这一预测,但需要未来的观察来澄清这一问题。由于特洛伊人的HD在H~9处翻转到一个碰撞平衡斜率,当特洛伊人仍然嵌入原始的海王星外盘时,我们的模型意味着同样的翻转应该表征柯伊伯带人口的HD,与Bernstein等人(2004)和Fuentes和Holman(2008)的结果一致。最后,我们表明,由尼斯模型施加的原始trans-Neptunian盘的总质量的约束意味着它是不可能的冷人口形成超过35 AU。

英文摘要:

By examining the absolute magnitude (H) distributions (hereafter HD) of the cold and hot populations in the Kuiper belt and of the Trojans of Jupiter, we find evidence that the Trojans have been captured from the outer part of the primordial trans-Neptunian planetesimal disk. We develop a sketch model of the HDs in the inner and outer parts of the disk that is consistent with the observed distributions and with the dynamical evolution scenario known as the `Nice model'. This leads us to predict that the HD of hot population should have the same slope of the HD of the cold population for 6.5 < H < 9, both as steep as the slope of the Trojans' HD. Current data partially support this prediction, but future observations are needed to clarify this issue. Because the HD of the Trojans rolls over at H~9 to a collisional equilibrium slope that should have been acquired when the Trojans were still embedded in the primordial trans-Neptunian disk, our model implies that the same roll-over should characterize the HDs of the Kuiper belt populations, in agreement with the results of Bernstein et al. (2004) and Fuentes and Holman (2008). Finally, we show that the constraint on the total mass of the primordial trans-Neptunian disk imposed by the Nice model implies that it is unlikely that the cold population formed beyond 35 AU.

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