The circulation of dust in protoplanetary discs and the initial conditions of planet formation
- Resource Type
- Working Paper
- Authors
- Hansen, Bradley M. S.
- Source
- Subject
- Astrophysics - Earth and Planetary Astrophysics
- Language
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.
Comment: 13 pages, 14 figures, to appear in Monthly Notices of Royal Astronomical Society