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arXiv 2103.05119astro-ph.EP
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模拟土星的D68团块作为共轨卫星系统

Modeling Saturn's D68 clumps as a co-orbital satellite system

Joseph A. A'Hearn, Matthew M. Hedman, Douglas P. Hamilton

摘要:

D68小环是土星环中最内层的特征。在2014年左右出现在D68中的四个团块保持均匀间隔约30度,并且从2014年到2017年进行最后一次测量时相对移动非常缓慢。D68的狭窄性和团块的分布要么表明我们有一系列处于共轨配置的源体,要么意味着外力限制了观察到的尘埃和任何源体。在本文中,我们探讨的可能性,这四个团簇产生于四个源机构在一个共轨配置。我们发现,没有四个质量的解决方案,产生所观察到的间距。因此,我们考虑是否一个看不见的第五个共轨物体可以解释角间距的差异,并接近一个稳定的静止配置。我们找到了一系列的解决方案,为五个共轨物体,其质量比取决于第五质量的假设位置。五个共轨道的数值模拟对初始条件非常敏感,特别是对于我们期望的D68团块的质量范围。我们的D68共轨系统模型的脆弱性意味着可能有一些外力将材料限制在这个小环中。

英文摘要:

The D68 ringlet is the innermost feature in Saturn's rings. Four clumps that appeared in D68 around 2014 remained evenly spaced about 30 degrees apart and moved very slowly relative to each other from 2014 up until the last measurements were taken in 2017. D68's narrowness and the distribution of clumps could either indicate that we have a collection of source bodies in a co-orbital configuration or imply that an outside force confines the observed dust and any source bodies. In this paper we explore the possibility that these four clumps arose from four source bodies in a co-orbital configuration. We find that there are no solutions with four masses that produce the observed spacings. We therefore consider whether an unseen fifth co-orbital object could account for the discrepancies in the angular separations and approach a stable stationary configuration. We find a range of solutions for five co-orbital objects where their mass ratios depend on the assumed location of the fifth mass. Numerical simulations of five co-orbitals are highly sensitive to initial conditions, especially for the range of masses we would expect the D68 clumps to have. The fragility of our D68 co-orbital system model implies that there is probably some outside force confining the material in this ringlet.

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