Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...481..519c&link_type=abstract
Astronomy and Astrophysics, Volume 481, Issue 2, 2008, pp.519-527
Astronomy and Astrophysics
Astrophysics
3
Planets And Satellites: Formation, Minor Planets, Asteroids, Celestial Mechanics
Scientific paper
Aims: We study trajectories of planetesimals whose orbits decay due to gas drag in a primordial solar nebula and are perturbed by the gravity of the secondary body on an eccentric orbit whose mass ratio takes values from μ2 = 10-7 to μ2 = 10-3 increasing ten times at each step. Each planetesimal ultimately suffers one of the three possible fates: (1) trapping in a mean motion resonance with the secondary body; (2) collision with the secondary body and consequent increase of its mass; or (3) diffusion after crossing the orbit of the secondary body. Methods: We take the Burlirsh-Stoer numerical algorithm in order to integrate the Newtonian equations of the planar, elliptical restricted three-body problem with the secondary body and the planetesimal orbiting the primary. It is assumed that there is no interaction among planetesimals, and also that the gas does not affect the orbit of the secondary body. Results: The results show that the optimal value of the gas drag constant k for the 1:1 resonance is between 0.9 and 1.25, representing a meter size planetesimal for each AU of orbital radius. In this study, the conditions of the gas drag are such that in theory, L4 no longer exists in the circular case for a critical value of k that defines a limit size of the planetesimal, but for a secondary body with an eccentricity larger than 0.05 when μ2 = 10-6, it reappears. The decrease of the cutoff collision radius increase the difusions but does not affect the distribution of trapping. The contribution to the mass accretion of the secondary body is over 40% with a collision radius 0.05R_Hill and less than 15% with 0.005R_Hill for μ2 = 10-7. The trappings no longer occur when the drag constant k reachs 30. That means that the size limit of planetesimal trapping is 0.2 m per AU of orbital radius. In most cases, this accretion occurs for a weak gas drag and small secondary eccentricity. The diffusions represent most of the simulations showing that gas drag is an efficient process in scattering planetesimals and that the trapping of planetesimals in the 1:1 resonance is a less probable fate. These results depend on the specific drag force chosen.
Cabo Winter Othon
Chanut T.
Tsuchida Masayoshi
No associations
LandOfFree
Nebular gas drag and co-orbital system dynamics 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 Nebular gas drag and co-orbital system dynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nebular gas drag and co-orbital system dynamics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1421092