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On the Feeding Zone of Planetesimal Formation by the Streaming Instability

Yang, Chao-Chin LU and Johansen, Anders LU (2014) In Astrophysical Journal 792(2).
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
planets and satellites: formation, asteroids: general, minor planets, methods: numerical, hydrodynamics, instabilities, protoplanetary, disks
in
Astrophysical Journal
volume
792
issue
2
publisher
University of Chicago Press
external identifiers
  • wos:000341172200004
  • scopus:84906769947
ISSN
0004-637X
DOI
10.1088/0004-637X/792/2/86
language
English
LU publication?
yes
id
8c916cc1-450e-42e6-9e08-4fdc267170f8 (old id 4717191)
date added to LUP
2014-10-31 09:06:01
date last changed
2017-10-29 04:01:16
@article{8c916cc1-450e-42e6-9e08-4fdc267170f8,
  abstract     = {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.},
  articleno    = {86},
  author       = {Yang, Chao-Chin and Johansen, Anders},
  issn         = {0004-637X},
  keyword      = {planets and satellites: formation,asteroids: general,minor planets,methods: numerical,hydrodynamics,instabilities,protoplanetary,disks},
  language     = {eng},
  number       = {2},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {On the Feeding Zone of Planetesimal Formation by the Streaming Instability},
  url          = {http://dx.doi.org/10.1088/0004-637X/792/2/86},
  volume       = {792},
  year         = {2014},
}