Formation and Dissociation of Clathrate Hydrates in the Comet 67P/Churyumov Gerasimenko

Details Formation and Dissociation of Clathrate Hydrates in the Comet 67P/Churyumov Gerasimenko Formation and Dissociation of Clathrate Hydrates in the Comet 67P/Churyumov Gerasimenko

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1405m&link_type=abstract

American Astronomical Society, DPS meeting #42, #14.05; Bulletin of the American Astronomical Society, Vol. 42, p.973

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Current interior models describing the thermodynamic evolution of short-period comets consider water ice existing only in the form of amorphous or crystalline ice. However, a third structure of ice, i.e., clathrate, that has the capability of trapping efficiently other volatiles, can exist within these bodies. Here we present a new model of cometary nucleus, which describes the formation and dissociation processes of clathrates within comets. We investigate their formation and evolution conditions within Comet 67P/Churyumov Gerasimenko, i.e. the target of the Rosetta mission. We show that, provided that the kinetics of clathrates formation is fast enough, a permanent layer of multiple guest clathrates can be formed in the subsurface of this comet. We show that the formation of such a layer alters the thermal and physical evolution of the comet and the outgasing profile of volatiles compared to models without formation of clathrates. These results allow us to predict different outgassing profiles of volatiles that could be measured by the Rosetta mission and can be used to constrain the structural type of ice existing in the interior of Comet 67P/Churyumov Gerasimenko.

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