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arXiv 0908.1729astro-ph.EP
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多一颗行星的海王星迁移模型

Neptune migration model with one extra planet

Lun-Wen Yeh, Hsiang-Kuang Chang

摘要:

在传统的海王星迁移模型中,我们增加了一颗质量为0.1-2.0 Me的行星,这颗行星在行星迁移时期与海王星处于3:2的平均运动共振状态,当类木行星停驻在现在的轨道附近时,脱离了柯伊伯带。在传统的海王星迁移模型中,加上这颗额外的行星,并假设原始盘在45 AU处被截断,它能够在几个方面比通常的海王星迁移模型更好地解释观测到的柯伊伯带的复杂结构。然而,数值实验表明,该模型是一个低概率事件。除了低概率外,该模型产生的两个特征可能与观测结果不一致。它们是经典带中的少量低倾角粒子和a = 50-52 AU范围内的近圆低倾角轨道的剩余粒子群的产生。根据我们目前的研究,包括一个额外的行星在传统的海王星迁移模型的情况下,我们在这里探讨可能是不合适的,因为概率低,和上述两个缺点,虽然这个模型可以更好地解释一些功能,是很难产生的传统海王星迁移模型。低概率事件和缺乏低倾角KBO在经典带的问题是有趣的,并可能进一步研究在一个更现实的考虑。

英文摘要:

We explore conventional Neptune migration model with one additional planet of mass at 0.1-2.0 Me. This planet inhabited in the 3:2 mean motion resonance with Neptune during planet migration epoch, and then escaped from the Kuiper belt when Jovian planets parked near the present orbits. Adding this extra planet and assuming the primordial disk truncated at about 45 AU in the conventional Neptune migration model, it is able to explain the complex structure of the observed Kuiper belt better than the usual Neptune migration model did in several respects. However, numerical experiments imply that this model is a low-probability event. In addition to the low probability, two features produced by this model may be inconsistent with the observations. They are small number of low-inclination particles in the classical belt, and the production of a remnant population with near-circular and low-inclination orbit within a = 50-52 AU. According to our present study, including one extra planet in the conventional Neptune migration model as the scenario we explored here may be unsuitable because of the low probability, and the two drawbacks mentioned above, although this model can explain better several features which is hard to produce by the conventional Neptune migration model. The issues of low-probability event and the lack of low-inclination KBOs in the classical belt are interesting and may be studied further under a more realistic consideration.

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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