Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pfte.confe...9i&link_type=abstract
Presented at the KITP Conference: Planet Formation: Terrestrial and Extra Solar, Mar 17, 2004, Kavli Institute for Theoretical P
Physics
Scientific paper
We carried out simulations to predict the distributions of masses andsemi major axes (periods) of extra solar planets, modelling theaccretion of cores of giant planets from planetesimals,gas accretion onto the cores, and their orbital migration. We adopteda working model for nascent protostellar disks with a wide variety ofsurface density distributions, which are comparable to those inferredfrom the observations of circumstellar disks of T Tauri stars.Since planets' masses grow rapidly from 10 M_E to 100 M_E, we predictthat the gas giant planets rarely form with asymptotic masses inthis intermediate mass range at < 3AU. We refer to this deficit asa ``planet desert''. We also predict that the frequency of gas giantplanets that are detectable with current radial velocity search isgreatly enhanced in metal-rich protostellar disks, which is consistentwith the observation. Protoplanetary cores can grow to severalEarth masses prior to the disk gas depletion in such environment andthese large masses are required for the cores to initiate rapid gasaccretion and to transform into giant planets.We also suggest that more than ninety percent of planets migrated to thevicinity of their host stars are perished.
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