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We study the formation conditions of icy planetesimals in protoplanetarydisks in order to determine the composition of ices in small and coldextrasolar planets. Assuming that ices are formed from hydrates, clathrates,and pure condensates, we calculate their mass fractions with respect to thetotal quantity of ices included in planetesimals, for a grid of disk models. Wefind that the composition of ices weakly depends on the adopted diskthermodynamic conditions, and is rather influenced by the initial compositionof the gas phase. The use of a plausible range of molecular abundance ratiosand the variation of the relative elemental carbon over oxygen ratio in the gasphase of protoplanetary disks, allow us to apply our model to a wide range ofplanetary systems. Our results can thus be used to constrain the icy/volatilephase composition of cold planets evidenced by microlensing surveys,hypothetical ocean-planets and carbon planets, which could be detected by Corotor Kepler.

Composition of Ices in Low-Mass Extrasolar Planets