木星和土星周围亚卫星的动态有利宿主
Dynamically favorable hosts for submoons around Jupiter and Saturn
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中文总结 AI 辅助
该研究通过N体积分模拟测试木星和土星大量卫星周围亚卫星的存活情况，排名得出伊阿佩托斯、泰坦等6颗卫星是亚卫星的动态最有利宿主。
中文摘要 AI 辅助
此前，人们已通过三体问题的解析近似方法研究了太阳系中围绕天然卫星（亚卫星）运行的小天体的长期稳定性，该方法主要关注潮汐力，忽略了其他摄动，其结论认为太阳系中大多数规则卫星周围的亚卫星都可能稳定存在，但迄今为止尚未探测到此类天体。本研究扩展了此前的结果，通过数值测试木星和土星大量卫星周围亚卫星的存活情况，旨在根据模拟时间尺度内亚卫星存活的动态有利程度对木星和土星的卫星进行排名。对于所考虑的每一颗规则或不规则卫星，研究人员进行了130次独立的N体积分模拟，每次模拟包含一颗具有不同初始半长轴和倾角的假想亚卫星。基于1百万年的存活比例，研究人员对模拟时间尺度内亚卫星存活的动态有利程度进行了卫星排名。研究发现，经过1百万年的时间，存活比例最高（超过30%）的卫星包括：伊阿佩托斯（≈37%）、泰坦（≈35%）、瑞亚（≈32%）、菲比（30%）、卡利斯托（≈34%）和盖尼米德。这些存活比例并非提供亚卫星存在的绝对概率，而是用于识别动态最有利的宿主卫星，伊阿佩托斯、泰坦、瑞亚、菲比、卡利斯托和盖尼米德是所测试卫星中动态最有利的亚卫星宿主。
英文摘要
The long-term stability of small bodies orbiting natural satellites (submoons) in the Solar System has been previously investigated using an analytical approximation of a three-body problem, focusing mainly on tidal forces and neglecting other perturbations. This approach suggests that submoons around most of the regular satellites in the Solar System could be stable. However, no such object has been detected to date. In this work, we extend these previous results by numerically testing the survival of submoons around a large number of satellites of Jupiter and Saturn. Our goal is to rank the satellites of Jupiter and Saturn according to how dynamically favorable they are for submoon survival over the simulated timescales. For each regular or irregular satellite considered, we performed 130 separate N-body integrations, each containing one hypothetical submoon with a different initial semimajor axis and inclination. From the 1 Myr survival fractions, we rank the satellites according to their dynamical favorability for submoon survival over the simulated timescale. We find that, after 1 Myr, the satellites with the highest survival fractions (above 30%) are Iapetus ($\approx 37\%$), Titan ($\approx 35\%$), Rhea ($\approx 32\%$), Phoebe ($30\%$), Callisto ($\approx 34\%$), and Ganymede ($30\%$). Rather than providing absolute probabilities for the existence of submoons, these survival fractions identify the most dynamically favorable hosts. Iapetus, Titan, Rhea, Phoebe, Callisto, and Ganymede are the most dynamically favorable submoon hosts among the tested satellites.
发表机构
- Centro Interdipartimentale di Ricerca Industriale Aerospaziale, Alma Mater Studiorum, Università di Bologna（博洛尼亚大学航空航天工业跨部门研究中心）
- LTE, Observatoire de Paris, Université PSL, Sorbonne Université, Université de Lille, LNE,CNRS（巴黎天文台）
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