Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...636l.149c&link_type=abstract
The Astrophysical Journal, Volume 636, Issue 2, pp. L149-L152.
Astronomy and Astrophysics
Astronomy
45
Accretion, Accretion Disks, Hydrodynamics, Instabilities, Stars: Planetary Systems: Formation, Stars: Planetary Systems: Protoplanetary Disks
Scientific paper
Observational studies show that the probability of finding gas giant planets around a star increases with the star's metallicity. Our latest simulations of disks undergoing gravitational instabilities (GIs) with realistic radiative cooling indicate that protoplanetary disks with lower metallicity generally cool faster and thus show stronger overall GI activity. More importantly, the global cooling times in our simulations are too long for disk fragmentation to occur, and the disks do not fragment into dense protoplanetary clumps. Our results suggest that direct gas giant planet formation via disk instabilities is unlikely to be the mechanism that produced most observed planets. Nevertheless, GIs may still play an important role in a hybrid scenario, compatible with the observed metallicity trend, where structure created by GIs accelerates planet formation by core accretion.
Boley Aaron C.
Cai Kai
D'Alessio Paola
Durisen Richard H.
Mejia Annie C.
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