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Concentrating small particles in protoplanetary disks through the streaming instability

Yang, C. C. LU ; Johansen, A. LU and Carrera, D. LU (2017) In Astronomy and Astrophysics 606.
Abstract

Laboratory experiments indicate that direct growth of silicate grains via mutual collisions can only produce particles up to roughly millimeters in size. On the other hand, recent simulations of the streaming instability have shown that mm/cm-sized particles require an excessively high metallicity for dense filaments to emerge. Using a numerical algorithm for stiff mutual drag force, we perform simulations of small particles with significantly higher resolutions and longer simulation times than in previous investigations. We find that particles of dimensionless stopping time τs = 10-2 and 10-3 - representing cm- and mm-sized particles interior of the water ice line - concentrate themselves via the... (More)

Laboratory experiments indicate that direct growth of silicate grains via mutual collisions can only produce particles up to roughly millimeters in size. On the other hand, recent simulations of the streaming instability have shown that mm/cm-sized particles require an excessively high metallicity for dense filaments to emerge. Using a numerical algorithm for stiff mutual drag force, we perform simulations of small particles with significantly higher resolutions and longer simulation times than in previous investigations. We find that particles of dimensionless stopping time τs = 10-2 and 10-3 - representing cm- and mm-sized particles interior of the water ice line - concentrate themselves via the streaming instability at a solid abundance of a few percent. We thus revise a previously published critical solid abundance curve for the regime of τs ≪ 1. The solid density in the concentrated regions reaches values higher than the Roche density, indicating that direct collapse of particles down to mm sizes into planetesimals is possible. Our results hence bridge the gap in particle size between direct dust growth limited by bouncing and the streaming instability.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hydrodynamics, Instabilities, Methods: numerical, Minor planets, asteroids: general, Planets and satellites: formation, Protoplanetary disks
in
Astronomy and Astrophysics
volume
606
publisher
EDP Sciences
external identifiers
  • scopus:85031726563
  • wos:000413559600005
ISSN
0004-6361
DOI
10.1051/0004-6361/201630106
language
English
LU publication?
yes
id
f49956bf-b12c-4a1b-9eac-5cb2aa79272e
date added to LUP
2017-10-30 14:36:58
date last changed
2018-09-09 04:55:33
@article{f49956bf-b12c-4a1b-9eac-5cb2aa79272e,
  abstract     = {<p>Laboratory experiments indicate that direct growth of silicate grains via mutual collisions can only produce particles up to roughly millimeters in size. On the other hand, recent simulations of the streaming instability have shown that mm/cm-sized particles require an excessively high metallicity for dense filaments to emerge. Using a numerical algorithm for stiff mutual drag force, we perform simulations of small particles with significantly higher resolutions and longer simulation times than in previous investigations. We find that particles of dimensionless stopping time τ<sub>s</sub> = 10<sup>-2</sup> and 10<sup>-3</sup> - representing cm- and mm-sized particles interior of the water ice line - concentrate themselves via the streaming instability at a solid abundance of a few percent. We thus revise a previously published critical solid abundance curve for the regime of τ<sub>s</sub> ≪ 1. The solid density in the concentrated regions reaches values higher than the Roche density, indicating that direct collapse of particles down to mm sizes into planetesimals is possible. Our results hence bridge the gap in particle size between direct dust growth limited by bouncing and the streaming instability.</p>},
  articleno    = {A80},
  author       = {Yang, C. C. and Johansen, A. and Carrera, D.},
  issn         = {0004-6361},
  keyword      = {Hydrodynamics,Instabilities,Methods: numerical,Minor planets, asteroids: general,Planets and satellites: formation,Protoplanetary disks},
  language     = {eng},
  month        = {10},
  publisher    = {EDP Sciences},
  series       = {Astronomy and Astrophysics},
  title        = {Concentrating small particles in protoplanetary disks through the streaming instability},
  url          = {http://dx.doi.org/10.1051/0004-6361/201630106},
  volume       = {606},
  year         = {2017},
}