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  Impact of magneto-rotational instability on grain growth in protoplanetary disks - II. Increased grain collisional velocities

Gong, M., Ivlev, A. V., Akimkin, V., & Caselli, P. (2021). Impact of magneto-rotational instability on grain growth in protoplanetary disks - II. Increased grain collisional velocities. The Astrophysical Journal, 917(2): 82. doi:10.3847/1538-4357/ac0ce8.

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Gong, Munan1, Author              
Ivlev, Alexej V.1, Author              
Akimkin, Vitaly, Author
Caselli, Paola1, Author              
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1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: Turbulence is the dominant source of collisional velocities for grains with a wide range of sizes in protoplanetary disks. So far, only Kolmogorov turbulence has been considered for calculating grain collisional velocities, despite the evidence that turbulence in protoplanetary disks may be non-Kolmogorov. In this work, we present calculations of grain collisional velocities for arbitrary turbulence models characterized by power-law spectra and determined by three dimensionless parameters: the slope of the kinetic energy spectrum, the slope of the autocorrelation time, and the Reynolds number. The implications of our results are illustrated by numerical simulations of the grain size evolution for different turbulence models. We find that for the modeled cases of the Iroshnikov–Kraichnan turbulence and the turbulence induced by the magnetorotational instabilities, collisional velocities of small grains are much larger than those for the standard Kolmogorov turbulence. This leads to faster grain coagulation in the outer regions of protoplanetary disks, resulting in rapid increase of dust opacity in millimeter wavelength and possibly promoting planet formation in very young disks.

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 Dates: 2021-08-20
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ac0ce8
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 917 (2) Sequence Number: 82 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3