Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf...59a&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present models of giant planet formation, taking into account migration and disk viscous evolution. We show that migration can significantly reduce the formation timescale bringing it in good agreement with typical observed disk lifetimes. We then present a model that produces a planet whose current location, core mass and total mass are comparable with the one of Jupiter. For this model, we calculate the enrichment in volatiles and compare them with the one measured by the Galileo probe. We show that, reconciling both the measured surface enrichments and the constraints derived by Guillot et al. (2004) is only possible if we assume accretion of purely icy planetesimals (containing no rocks) and a N2/NH3 ratio equal to 1. Furthermore, a slightly better agreement is obtained if one assumes core erosion and/or volatiles release from the planetesimals during core formation.
Alibert Yann
Benz Willy
Mordasini Christophe
Mousis Olivier
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