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

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タイトル: Tidal deformation of Ganymede: Sensitivity of Love numbers on the interior structure
著者: Kamata, Shunichi 著作を一覧する
Kimura, Jun 著作を一覧する
Matsumoto, Koji 著作を一覧する
Nimmo, Francis 著作を一覧する
Kuramoto, Kiyoshi 著作を一覧する
Namiki, Noriyuki 著作を一覧する
発行日: 2016年 7月28日
出版者: American Geophysical Union
誌名: Journal of Geophysical Research: Planets
巻: 121
号: 7
開始ページ: 1362
終了ページ: 1375
出版社 DOI: 10.1002/2016JE005071
抄録: 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
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 鎌田 俊一


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