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arXiv 2405.03350astro-ph.EP
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含地下海洋的冰卫星受迫天平动简化模型:在土卫二(Enceladus)和土卫一(Mimas)上的应用

A Simplified Model for the Forced Libration of Icy Moons with Subsurface Oceans: Application to Enceladus and Mimas

King Abdullah University of Science and Technology(阿卜杜拉国王科技大学)

Yeva Gevorgyan

AI总结:

本文提出仅含预应力冰壳与等效流体核的两层黏弹性流变模型,可描述带地下海洋冰卫星的受迫天平动,基于卡西尼号数据应用于土卫二、土卫一,可用于预测冰卫星地下海洋存在性。

摘要:

我们研究了一种简单的两层黏弹性流变模型,该模型可复现存在地下海洋的冰卫星的受迫天平动特性。我们证明,该模型仅由覆盖在等效流体核(固定地幔腔)上的预应力冰壳构成,即可有效描述冰卫星的天平动行为,因此有望通过分析经度天平动预测地下海洋的存在。我们将所提出的模型应用于土卫二(Enceladus)和土卫一(Mimas)的经度天平动分析,这两颗土星小型冰卫星的相关观测数据均来自卡西尼号(Cassini)探测任务。

英文摘要:

We investigate a simple two-layered viscoelastic rheological model capable of replicating the forced librations of an icy moon with a subsurface ocean. We show that the model, composed only of a prestressed icy crust lying over an effective fluid core (a fixed mantle cavity), can effectively describe the librational behavior of icy moons, thus holding the potential to predict the presence of a subsurface ocean through the analysis of longitudinal librations. The proposed model is applied to the longitudinal librations of Enceladus and Mimas, two small icy moons of Saturn for which relevant data is available from the Cassini mission.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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