Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3519203c&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 19, CiteID L19203
Physics
5
Planetary Sciences: Solar System Objects: Saturnian Satellites, Planetary Sciences: Solid Surface Planets: Hydrology And Fluvial Processes, Planetary Sciences: Solid Surface Planets: Ices
Scientific paper
Flexural modeling of Ithaca Chasma on Tethys suggests that the elastic thickness and the surface heat flux were 5-7 km and 18-30 mW/m2 respectively, when the feature formed (~4 Gyr B.P.). Tidal heating is a plausible heat source, suggesting that Tethys' eccentricity was higher in the past. Depending on Tethys' internal structure, eccentricities in the range 0.001 to 0.02 are sufficient to have generated the inferred heat flux. Because the eccentricity damping timescale is short, <20 Myr, it is unlikely that this eccentricity was primordial. More likely, Tethys' eccentricity increased during passage through a 3:2 resonance with Dione. In equilibrium, this resonance produces ~2.5 mW/m2 suggesting that non-equilibrium or periodic heating was important, similar to the case for Enceladus at present.
Chen M. A. E.
Nimmo Francis
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