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arXiv 1701.07041astro-ph.EP
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在一个很好的模式方案中的远距离柯伊伯带的结构

The Structure of the Distant Kuiper Belt in a Nice Model Scenario

Rosemary E. Pike, Samantha Lawler, Ramon Brasser, Cory J. Shankman, Mike Alexandersen, J. J. Kavelaars

摘要:

这项工作探讨了外太阳系中小天体的轨道分布,这些小天体是Brasser和Morbidelli(2013年)模拟的尼斯模型迁移的结果。这个行星迁移分散了一个29-34天文单位的小行星盘,并将一群天体安置在柯伊伯带区域。从2:1海王星共振和向外,分析的测试粒子填充外共振与轨道分布一致的跨海王星对象(TNO)的检测在半长轴,倾斜度和偏心率,而捕获到最近的共振是太有效。在3:1和4:1共振中的模拟散射物体和共振物体的相对种群也与基于去偏TNO调查的观察到的种群一致,但是与调查结果的种群估计相比,5:1共振的种群严重不足。散射安置的结果在预期的轨道分布为大多数的TNO人口,但在5:1共振的大观察人口的起源仍然无法解释。

英文摘要:

This work explores the orbital distribution of minor bodies in the outer Solar System emplaced as a result of a Nice model migration from the simulations of Brasser & Morbidelli (2013). This planetary migration scatters a planetesimal disk from between 29-34 AU and emplaces a population of objects into the Kuiper belt region. From the 2:1 Neptune resonance and outward, the test particles analyzed populate the outer resonances with orbital distributions consistent with trans-Neptunian object (TNO) detections in semi-major axis, inclination, and eccentricity, while capture into the closest resonances is too efficient. The relative populations of the simulated scattering objects and resonant objects in the 3:1 and 4:1 resonances are also consistent with observed populations based on debiased TNO surveys, but the 5:1 resonance is severely underpopulated compared to population estimates from survey results. Scattering emplacement results in the expected orbital distribution for the majority of the TNO populations, however the origin of the large observed population in the 5:1 resonance remains unexplained.

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