MARBOEUF, Ulysse; MOUSIS, O.; EHRENREICH, D.; ALIBERT, Y.; CASSAN, A.; WAKELAM, Valentine; BEAULIEU, J.

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MARBOEUF, Ulysse
Laboratoire d'astrophysique de l'observatoire de Besançon (UMR 6091) [LAOB]

MOUSIS, O.
Laboratoire d'astrophysique de l'observatoire de Besançon (UMR 6091) [LAOB]

EHRENREICH, D.
Institut d'Astrophysique de Paris [IAP]

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2008DPS....40.1110M - American Astronomical Society, DPS meeting #40, #11.10; Bulletin of the American Astronomical Society, 2008DPS....40.1110M - American Astronomical Society, DPS meeting #40, #11.10; Bulletin of the American Astronomical Society, 40th annual meeting of the Division for Planetary Sciences of the American Astronomical Society, 2008-10-10, Ithaca, NY. 2008, vol. 40, p. 403

Résumé en anglais

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

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Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804