A model of cometary nucleus taking into account all phase changes of water ice: amorphous, crystalline, and clathrate

Computer Science

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Scientific paper

We present a model of cometary nucleus which takes into account all structures of water ice (amorphous ice, crystalline ice and clathrate hydrate, or a mixture of these water ice structures) for the first time. This model describes heat transmission, latent heat exchanges, all water ices transitions (amorphous-topure crystalline, amorphous-to-clathrate hydrates and pure crystalline-to-clathrate hydrates and vise versa), sublimation/recondensation of volatile molecules in the nucleus, gas diffusion, gas release and trapped by crystallization and clathrate formation/dissociation processes, as well as gas and dust release and mantle formation at the surface. This model is able to predict the outgassing profile of volatile molecules that could be measured by the Rosetta mission and can be used to constrain the structural type of ice existing in the interior of the comet 67P/Churyumov Gerasimenko and, hopefully, its initial composition.

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