Shape, topography, gravity anomalies and tidal deformation of Titan

Research areas:
Year:
2014
Authors:
  • Giuseppe Mitri
  • Rachele Meriggiola
  • Alex Hayes
  • Axel Lefèvre
  • Gabriel Tobie
  • Antonio Genova
  • Jonathan I. Lunine
  • Howard Zebker
Journal:
ICARUS
Volume:
236
Pages:
169-177
Month:
JUL 1
ISSN:
0019-1035
Abstract:
Gravity measurements and elevation data from the Cassini mission have been used to create shape, global topography and gravity anomaly models of Titan that enable an improved understanding of its outer ice I shell structure. We provide constraints on the averaged ice shell thickness and its long-wavelength lateral variations, as well as the density of the subsurface ocean using gravity anomalies, the tidal Love number k(2) measurement and long-wavelength topography. We found that Titan's surface topography is consistent with an approximate isostatically compensated ice shell of variable thickness, likely in a thermally conductive or in a subcritical convective state, overlying a relatively dense subsurface ocean. (C) 2014 Elsevier Inc. All rights reserved.