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Title: Dust Growth by Accretion of Molecules in Supersonic Interstellar Turbulence

Abstract

We show that the growth rate of dust grains in cold molecular clouds is enhanced by the high degree of compressibility of a turbulent, dilute gas. By means of high-resolution (10243) numerical simulations, we confirm the theory that the spatial mean growth rate is proportional to the gas-density variance. This also results in broadening of the grain-size distribution (GSD) due to turbulence-induced variation of the grain-growth rate. We show, for the first time in a detailed numerical simulation of hydrodynamic turbulence, that the GSD evolves toward a shape that is a reflection of the gas-density distribution, regardless of the initial distribution. That is, in case of isothermal, rotationally forced turbulence, the GSD tends to be a lognormal distribution. We also show that in hypersonic turbulence, decoupling of gas and dust becomes important and that this leads to an even further accelerated grain growth.

Authors:
ORCiD logo [1];  [2]
  1. KTH Royal Inst. of Technology, Stockholm (Sweden); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. KTH Royal Inst. of Technology, Stockholm (Sweden)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE; Knut and Alice Wallenberg Foundation; Swedish Research Council (SRC)
OSTI Identifier:
1719128
Report Number(s):
PNNL-SA-153790
Journal ID: ISSN 0004-637X
Grant/Contract Number:  
AC05-76RL01830; KAW-2014.0048; 2015-04505
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 903; Journal Issue: 2; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; interstellar dust processes; shocks; interplanetary turbulence

Citation Formats

Li, Xiang-Yu, and Mattsson, Lars. Dust Growth by Accretion of Molecules in Supersonic Interstellar Turbulence. United States: N. p., 2020. Web. https://doi.org/10.3847/1538-4357/abb9ad.
Li, Xiang-Yu, & Mattsson, Lars. Dust Growth by Accretion of Molecules in Supersonic Interstellar Turbulence. United States. https://doi.org/10.3847/1538-4357/abb9ad
Li, Xiang-Yu, and Mattsson, Lars. Thu . "Dust Growth by Accretion of Molecules in Supersonic Interstellar Turbulence". United States. https://doi.org/10.3847/1538-4357/abb9ad. https://www.osti.gov/servlets/purl/1719128.
@article{osti_1719128,
title = {Dust Growth by Accretion of Molecules in Supersonic Interstellar Turbulence},
author = {Li, Xiang-Yu and Mattsson, Lars},
abstractNote = {We show that the growth rate of dust grains in cold molecular clouds is enhanced by the high degree of compressibility of a turbulent, dilute gas. By means of high-resolution (10243) numerical simulations, we confirm the theory that the spatial mean growth rate is proportional to the gas-density variance. This also results in broadening of the grain-size distribution (GSD) due to turbulence-induced variation of the grain-growth rate. We show, for the first time in a detailed numerical simulation of hydrodynamic turbulence, that the GSD evolves toward a shape that is a reflection of the gas-density distribution, regardless of the initial distribution. That is, in case of isothermal, rotationally forced turbulence, the GSD tends to be a lognormal distribution. We also show that in hypersonic turbulence, decoupling of gas and dust becomes important and that this leads to an even further accelerated grain growth.},
doi = {10.3847/1538-4357/abb9ad},
journal = {Astrophysical Journal},
number = 2,
volume = 903,
place = {United States},
year = {2020},
month = {11}
}

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