论文标题

潜在的Themis家族小行星对木星家庭彗星的贡献

Potential Themis Family Asteroid Contribution to the Jupiter-Family Comet Population

论文作者

Hsieh, Henry H., Novakovic, Bojan, Walsh, Kevin J., Schorghofer, Norbert

论文摘要

最近的动态分析表明,一些木星家族彗星(JFC)可能起源于主要的小行星带,而不是外部太阳系。鉴于有证据表明冰冷的主带物体存在于小行星家族中,这种可能性特别有趣。我们报告了动态分析的结果,该结果专门研究了冰冷的themis家族成员可以为观察到的肯尼迪人群做出贡献的可能性。数值整合表明,这种动态演化确实是通过偏心兴奋的组合,显然是由附近的2:1均值 - 动作与木星,与木星以外的行星的重力相互作用以及Yarkovsky效应的重力相互作用。我们估计,在任何给定的时间,在类似JFC的轨道上可能会有数十个物体,有可能从外部太阳系中模仿活跃的JFC,尽管并非全部甚至任何东西都可以观察到活跃。我们发现,在jFC状轨道上的动态演变为themis家族对象的半轴轴在3.15 au和3.40 au之间,大部分时间在此类轨道上的大部分时间都与2:1平均动作共振的强大作用一致,这与木星可能在动态进化中发挥作用。我们得出的结论是,尽管需要进一步的工作来更好地描述这一贡献,但Themis家族对主动jfc人群的贡献是合理的。

Recent dynamical analyses suggest that some Jupiter family comets (JFCs) may originate in the main asteroid belt instead of the outer solar system. This possibility is particularly interesting given evidence that icy main-belt objects are known to be present in the Themis asteroid family. We report results from dynamical analyses specifically investigating the possibility that icy Themis family members could contribute to the observed population of JFCs. Numerical integrations show that such dynamical evolution is indeed possible via a combination of eccentricity excitation apparently driven by the nearby 2:1 mean-motion resonance with Jupiter, gravitational interactions with planets other than Jupiter, and the Yarkovsky effect. We estimate that, at any given time, there may be tens of objects from the Themis family on JFC-like orbits with the potential to mimic active JFCs from the outer solar system, although not all, or even any, may necessarily be observably active. We find that dynamically evolved Themis family objects on JFC-like orbits have semimajor axes between 3.15 au and 3.40 au for the vast majority of their time on such orbits, consistent with the strong role that the 2:1 mean-motion resonance with Jupiter likely plays in their dynamical evolution. We conclude that a contribution from the Themis family to the active JFC population is plausible, although further work is needed to better characterize this contribution.

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