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Anders Johansen. Profile picture.

Anders Johansen

Professor

Anders Johansen. Profile picture.

On the Feeding Zone of Planetesimal Formation by the Streaming Instability

Author

  • Chao-Chin Yang
  • Anders Johansen

Summary, in English

The streaming instability is a promising mechanism to overcome the barriers in direct dust growth and lead to the formation of planetesimals. Most previous studies of the streaming instability, however, were focused on a local region of a protoplanetary disk with a limited simulation domain such that only one filamentary concentration of solids has been observed. The characteristic separation between filaments is therefore not known. To address this, we conduct the largest-scale simulations of the streaming instability to date, with computational domains up to 1.6 gas scale heights both horizontally and vertically. The large dynamical range allows the effect of vertical gas stratification to become prominent. We observe more frequent merging and splitting of filaments in simulation boxes of high vertical extent. We find multiple filamentary concentrations of solids with an average separation of about 0.2 local gas scale heights, much higher than the most unstable wavelength from linear stability analysis. This measures the characteristic separation of planetesimal forming events driven by the streaming instability and thus the initial feeding zone of planetesimals.

Department/s

  • Lund Observatory

Publishing year

2014

Language

English

Publication/Series

Astrophysical Journal

Volume

792

Issue

2

Document type

Journal article

Publisher

American Astronomical Society

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • planets and satellites: formation
  • asteroids: general
  • minor planets
  • methods: numerical
  • hydrodynamics
  • instabilities
  • protoplanetary
  • disks

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-637X