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Titan's strong tidal dissipation precludes a subsurface ocean.

Flavio Petricca1, Steven D Vance2, Marzia Parisi2

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Cassini data reanalysis suggests Titan

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Area of Science:

  • Planetary Science
  • Geophysics
  • Astrobiology

Background:

  • The Cassini mission provided extensive data on Saturn's moon, Titan.
  • Titan's tidal response to Saturn suggested a subsurface ocean, but this was not fully explained.
  • Previous models could not reconcile Titan's observed tidal response with geophysical data.

Purpose of the Study:

  • To reanalyze Cassini radiometric data to investigate Titan's tidal dissipation signature.
  • To determine if Titan's gravity field is consistent with a subsurface ocean.
  • To develop a model explaining Titan's geophysical measurements.

Main Methods:

  • Reanalysis of Cassini radiometric data using improved techniques.
  • Detection and analysis of tidal dissipation signatures in Titan's gravity field.
  • Modeling of tidal dissipation within Titan's interior.

Main Results:

  • The detected tidal dissipation signature is inconsistent with a subsurface ocean.
  • Substantial energy dissipation (3-4 TW) occurs in Titan's interior, with a tidal quality factor Q≈5.
  • A model with dissipation concentrated in a high-pressure ice layer near melting point explains the data.

Conclusions:

  • The presence of a subsurface ocean on Titan is precluded by the new findings.
  • Titan's geophysical state is explained by a model involving a slushy high-pressure ice layer, potentially with liquid water pockets.
  • This model reconciles Titan's rotational state, gravity field, and tidal dissipation, awaiting further testing by the Dragonfly mission.