Computer Science – Sound
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.0703h&link_type=abstract
American Astronomical Society, DPS meeting #41, #7.03
Computer Science
Sound
Scientific paper
We use a chemical equilibrium model to study the possible interior chemical composition of Titan, with a model that is accurate to relatively high pressures ( Mbars). The initial composition of Titan is taken as solar comet material, depleted in hydrogen by a factor 1000, with all other elements (including up to Ni) having a solar composition. The chemical equilibrium model includes an exponential exp-6 equation of state for fluids and a Murnaghan form for solids, the parameters for which are fitted to experimental shock Hugoniot data, isotropic compression and sound speed data from pressures of a few bars to that of a few Mbars. In addition, the model allows for a variety of mixtures. If we assume that Titan's interior composition is characterized by a freeze-out from an equilibrium at relatively high pressures ( few to 20 kbars), then we form some interesting conclusions about Titan's interior molecular composition. In particular, we find that near surface composition is characterized by N2 rather than NH3 and that the core may be dominated by graphite. Moreover, we also study the decomposition of tholins in Titan's interior and its implications for surface chemistry. We discuss the validity of our model assumptions and propose several experiments to validate our conclusions.
*This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
Bastea Sorin
Fried Laurence E.
Howard Michael
Khare Bishun
McKay Chris P.
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