Thermal–orbital evolution of Eris

IF 3 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2025-08-18 DOI:10.1016/j.icarus.2025.116770

Ryunosuke Akiba, Francis Nimmo

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引用次数: 0

Abstract

The large Kuiper Belt object (KBO) Eris is nearly as big as Pluto and has a small moon, Dysnomia. Constraints on the system’s spin and orbit characteristics were recently used to argue for a dissipative Eris, requiring a differentiated structure but not necessarily a subsurface ocean. Here, we model the thermal history of Eris coupled to its spin–orbital evolution, finding a subsurface ocean is preferred in order for Eris to be sufficiently dissipative. Spinning down Eris without an ocean is difficult, requiring a warm convecting ice shell protected by a thick insulating layer and very dissipative anelastic behavior in ice. Oceans make up 77%–100% of successful thermal–orbital evolution models, depending on the parameters assumed, which increases to

>

98% when the Andrade

β

parameter for ice is restricted to

β \leq 3 \times 1 0^{- 11}

Pa⁻¹ s

^{- 0.25}

. Oceans freeze over by the present day unless insulation (porosity, gas clathrates) or antifreeze are present.

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厄里斯的热轨道演化

大的柯伊伯带天体（KBO）厄里斯几乎和冥王星一样大，它有一个小卫星，Dysnomia。系统自旋和轨道特征的限制最近被用来论证耗散厄里斯，它需要一个分化的结构，但不一定是地下海洋。在这里，我们对厄里斯的热历史及其自旋轨道演化进行了建模，为了使厄里斯具有足够的耗散，最好找到一个地下海洋。在没有海洋的情况下旋转厄里斯是很困难的，这需要一个温暖的对流冰壳，由一层厚厚的绝缘层和冰中非常耗散的非弹性行为保护。海洋占成功热轨道演化模型的77%-100%，这取决于所假设的参数，当冰的Andrade β参数被限制为β≤3×10 - 11 Pa - 1 s - 0.25时，海洋占98%。除非有绝缘材料（孔隙、气体包合物）或防冻剂存在，否则到目前为止海洋都是冻结的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.