Long-range outward migration

View previous topic View next topic Go down

Long-range outward migration

Post by Sirius_Alpha on 6th October 2009, 8:59 pm

Long range outward migration of giant planets, with application to Fomalhaut b
http://arxiv.org/abs/0910.1004

Abstract wrote:Recent observations of exoplanets by direct imaging, reveal that giant planets orbit at a few dozens to more than a hundred of AU from their central star. The question of the origin of these planets challenges the standard theories of planet formation. We propose a new way of obtaining such far planets, by outward migration of a pair of planets formed in the 10 AU region. Two giant planets in mean motion resonance in a common gap in the protoplanetary disk migrate outwards, if the inner one is significantly more massive than the outer one. Using hydrodynamical simulations, we show that their semi major axes can increase by almost one order of magnitude. In a flared disk, the pair of planets should reach an asymptotic radius. This mechanism could account for the presence of Fomalhaut b ; then, a second, more massive planet, should be orbiting Fomalhaut at about 75 AU.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3433
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Long-range outward migration

Post by Lazarus on 7th October 2009, 4:03 pm

A case for the "mechanics" forum?

I guess the only way to validate this idea is to look for more planets around Fomalhaut. So now we've got gas giants migrating inwards to ridiculously small distances, gas giants migrating outwards to ridiculously large distances, wonder how many systems with minimal migration and scattering exist?
avatar
Lazarus
dG star
dG star

Number of posts : 2794
Registration date : 2008-06-12

View user profile

Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum