The circulation of dust in protoplanetary discs and the initial conditions of planet formation

Abstract

We examine the consequences of a model for the circulation of solids in a protoplanetary nebula in which aerodynamic drag is counterbalanced by the recycling of material to the outer disc by a protostellar outflow or a disc wind. This population of circulating dust eventually becomes unstable to the formation of planetesimals by gravitational instability, and results in the ultimate deposition of 30--50 earth masses in planetesimals on scales R< 1 AU. Such a model may provide an appropriate justification for the approximately power law initial conditions needed to reproduce observed planetary systems by in situ assembly.

13 pages, 14 figures, to appear in Monthly Notices of Royal Astronomical Society

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• Terrestrial Planet Formation in the Presence of Migrating Super-earths
• Perturbation of Compact Planetary Systems by Distant Giant Planets
• The "Breaking The Chains" migration model for super-Earths formation: the effect of collisional fragmentation
• On the maximum grain size entrained by photoevaporative winds
• Halting Migration in Magnetospherically Sculpted Protoplanetary Disks