Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.1239i&link_type=abstract
Astronomical Journal v.112, p.1239
Astronomy and Astrophysics
Astronomy
11
Hydrodynamics, Interplanetary Medium, Meteoroids
Scientific paper
We show that if the nebula gas was preserved for ˜106-7 yr after formation of the giant planets, asteroids would experience migration due to the hydrodynamic drag as well as to giant planetary perturbations. These combined effects can lead to the present spatial distribution of the main asteroid belt. In particular, gas drag is necessary for the depletion of asteroids in regions outside 3.2 A.U. Asteroids at Jupiter's 2:1 resonance are strongly perturbed by its gravity. The enhanced eccentricity induces a rapid orbital migration and a sharp drop-off in the asteroid distribution. The implication of our model is that nebula gas with several Jupiter masses was retained in the vicinity of the asteroid belt for a few times 106 yr after the formation of Jupiter and the effective nebula viscosity during that stage corresponds to α≃10-4 in the a prescription.
Ida Shigeru
Lin Doug N. C.
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