Dynamical evolution of the Uranian satellite system I.

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2024-08-30 DOI:10.1016/j.icarus.2024.116282
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Abstract

Mutual gravitational interactions between the five major Uranian satellites raise small quasi-periodic fluctuations on their orbital elements. At the same time, tidal interactions between the satellites and the planet induce a slow outward drift of the orbits, while damping the eccentricities and the inclinations. In this paper, we revisit the current and near past evolution of this system using a Nbody integrator, including spin evolution and tidal dissipation with the weak friction model. We update the secular eigenmodes of the system and show that it is unlikely that any of the main satellites were recently captured into a high obliquity Cassini state. We rather expect that the Uranian satellites are in a low obliquity Cassini state and compute their values. We also estimate the current variations in the eccentricities and inclinations, and show that they are not fully damped. We constrain the modified quality factor of Uranus to be QU=(1.2±0.4)×105, and that of Ariel to be QA=(7±3)×104. We find that the system most likely encountered the 5/3 mean motion resonance between Ariel and Umbriel in the past, at about (0.7±0.2) Gyr ago. We additionally determine the eccentricities and inclinations of all satellites just after the resonance passage that comply with the current system. We finally show that, from the crossing of the 5/3 MMR to the present, the evolution of the system is mostly peaceful and dominated by tides raised on Uranus by the satellites.

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天王星卫星系统的动态演变 I.
天王星五颗主要卫星之间的相互引力相互作用使它们的轨道元素产生了微小的准周期性波动。同时,卫星与行星之间的潮汐相互作用导致轨道缓慢向外漂移,同时抑制偏心率和倾角。在本文中,我们使用 N 体积分器重新审视了该系统当前和过去的演化,包括自旋演化和弱摩擦模型的潮汐耗散。我们更新了该系统的世俗特征模式,并表明最近不太可能有任何一颗主要卫星被捕获进入高倾角卡西尼状态。我们认为天王星卫星处于低倾角的卡西尼状态,并计算了它们的数值。我们还估算了当前偏心率和倾角的变化,并表明它们并没有完全被阻尼。我们将天王星的修正品质因数约束为 QU′=(1.2±0.4)×105,阿丽埃勒星的修正品质因数约束为 QA′=(7±3)×104。我们发现,该系统很可能在过去,即大约(0.7±0.2)Gyr前,遇到了Ariel和Umbriel之间的5/3平均运动共振。此外,我们还确定了共振通过后所有卫星的偏心率和倾角,这些都符合当前的系统。我们最后表明,从 5/3 MMR 穿越到现在,该系统的演化大多是和平的,主要由卫星在天王星上引发的潮汐所主导。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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