2024-03-28T16:20:08Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/728232022-11-17T02:08:08Zhdl_2115_20074hdl_2115_161Interior thermal state of Enceladus inferred from the viscoelastic state of the ice shell1000040723474Kamata, ShunichiNimmo, Francisopen access(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/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 InternationalEnceladusPlanetary dynamicsInteriors450Recent 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.Elsevier2017-03-01engjournal articleAMhttp://hdl.handle.net/2115/72823https://doi.org/10.1016/j.icarus.2016.11.0340019-1035Icarus284387393https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/72823/1/Kamata_and_Nimmo_2017_Icarus_final_draft.pdfapplication/pdf389.2 KB2017-03-01