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Tidal deformation of Ganymede: Sensitivity of Love numbers on the interior structure

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Title: Tidal deformation of Ganymede: Sensitivity of Love numbers on the interior structure
Authors: Kamata, Shunichi Browse this author
Kimura, Jun Browse this author
Matsumoto, Koji Browse this author
Nimmo, Francis Browse this author
Kuramoto, Kiyoshi Browse this author
Namiki, Noriyuki Browse this author
Issue Date: 28-Jul-2016
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research: Planets
Volume: 121
Issue: 7
Start Page: 1362
End Page: 1375
Publisher DOI: 10.1002/2016JE005071
Abstract: Tidal deformation of icy satellites provides crucial information on their subsurface structures. In this study, we investigate the parameter dependence of the tidal displacement and potential Love numbers (i.e., h(2) and k(2), respectively) of Ganymede. Our results indicate that Love numbers for Ganymede models without a subsurface ocean are not necessarily smaller than those with a subsurface ocean. The phase lag, however, depends primarily on the presence/absence of a subsurface ocean. Thus, the determination of the phase lag would be of importance to infer whether Ganymede possesses a subsurface ocean or not based only on geodetic measurements. Our results also indicate that the major control on Love numbers is the thickness of the ice shell if Ganymede possesses a subsurface ocean. This result, however, does not necessarily indicate that measurement of either of h(2) or k(2) alone is sufficient to estimate the shell thickness; while a thin shell leads to large h(2) and k(2) independent of parameters, a thick shell does not necessarily lead to small h(2) and k(2). We found that to reduce the uncertainty in the shell thickness, constraining k(2) in addition to h(2) is necessary, highlighting the importance of collaborative analyses of topography and gravity field data.
Rights: © 2016 American Geophysical Union
Type: article
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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