Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.0604c&link_type=abstract
American Astronomical Society, DDA meeting #38, #6.04
Astronomy and Astrophysics
Astronomy
Scientific paper
In the currently favoured core-accretion model, a giant planet begins life as a solid core that accumulates from smaller planetesimals. When a core reaches a critical size of roughly 10 Earth masses, it begins to accrete a massive gaseous envelope from the surrounding protoplanetary disk, forming a gas-giant planet. Current models predict that giant-planet cores will form within a protoplanetary disk before the disk gas disperses provided the disk is a few times more massive than the minimum-mass solar nebula. Gravitational interaction between a planetary core and the disk cause rapid inward type-I migration of the core. A 10-Earth-mass core initially at 5 AU will migrate into its star in less than 100,000 years in a minimum-mass nebula. Giant planets themselves open an annular gap in the disk and undergo slower type-II migration, moving with the viscous flow of the disk gas. Both type-I and type-II migration rates are sufficiently fast that it remains unclear how planets can form and survive in the presence of migration. Here, I will describe results of a new semi-analytic model for the growth and migration of planetary cores and giant planets designed to examine this issue. I will show that giant planets can form and survive under a range of conditions. In particular, low disk mass, low disk viscosity and small planetesimal size promote the formation and survival of giant planets. Migration remains substantial in most cases, leading to a wide range of outcomes. Planetary systems similar to the Solar System can occur, but only in a small fraction of parameter space.
This work was supported by the NASA TPF foundation science programme.
No associations
LandOfFree
Planet Formation with Type I and Type II Migration does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Planet Formation with Type I and Type II Migration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planet Formation with Type I and Type II Migration will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1662607