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Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell

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Title: Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell
Authors: Kamata, Shunichi Browse this author →KAKEN DB
Nimmo, Francis Browse this author
Keywords: Enceladus
Planetary dynamics
Interiors
Issue Date: 1-Mar-2017
Publisher: Elsevier
Journal Title: Icarus
Volume: 284
Start Page: 387
End Page: 393
Publisher DOI: 10.1016/j.icarus.2016.11.034
Abstract: Recent geodetic measurements for Enceladus suggest a global subsurface ocean that is thicker beneath the south pole. In order to maintain such an ocean, viscous relaxation of topography at the base of the ice shell and melting of ice need to be balanced. In this study, we investigate the interior thermal state that can lead to the relaxation timescale being comparable to the melting timescale. Our results indicate that a basal heat flux about ten times higher than that due to radiogenic heating, or an ice shell tidal heating rate about ten times higher than the conventional estimate of 1.1 GW is necessary if the ice shell is in thermal equilibrium. These requirements are concordant with recent astrometric studies.
Rights: (C) 2016 Elsevier Inc. All rights reserved. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/72823
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鎌田 俊一

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