Accretion of Terrestrial Planets from Oligarchs in a Turbulent Disk

Details Accretion of Terrestrial Planets from Oligarchs in a Turbulent Disk Accretion of Terrestrial Planets from Oligarchs in a Turbulent Disk

2006-12-21

arxiv.org/abs/astro-ph/0612619v1

Astronomy and Astrophysics

Astrophysics

accepted for publication in Icarus; 19 pages, 8 figures, 1 table

Scientific paper

10.1016/j.icarus.2006.12.006

We have investigated the final accretion stage of terrestrial planets from Mars-mass protoplanets that formed through oligarchic growth in a disk comparable to the minimum mass solar nebula (MMSN), through N-body simulation including random torques exerted by disk turbulence due to Magneto-Rotational-Instability. For the torques, we used the semi-analytical formula developed by Laughlin et al.(2004). The damping of orbital eccentricities (in all runs) and type-I migration (in some runs) due to the tidal interactions with disk gas are also included. We found that the orbital eccentricities pumped up by the turbulent torques and associated random walks in semimajor axes tend to delay isolation of planets, resulting in more coagulation of planets than in the case without turbulence. The eccentricities are still damped after planets become isolated. As a result, the number of final planets decreases with increase in strength of the turbulence, while Earth-mass planets with small eccentricities are still formed. In the case of relatively strong turbulence, the number of final planets are 4-5 at 0.5-2AU, which is consistent with Solar system, for relatively wide range of disk surface density (~10^{-4}-10^{-2} times MMSN).

Affiliated with

Also associated with

No associations

Rating

Accretion of Terrestrial Planets from Oligarchs in a Turbulent Disk 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 Accretion of Terrestrial Planets from Oligarchs in a Turbulent Disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Accretion of Terrestrial Planets from Oligarchs in a Turbulent Disk will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-21233