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  Inhibited coagulation of micron-size dust due to the electrostatic barrier

Akimkin, V. V., Ivlev, A. V., & Caselli, P. (2020). Inhibited coagulation of micron-size dust due to the electrostatic barrier. The Astrophysical Journal, 889(1): 64. doi:10.3847/1538-4357/ab6299.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-54D0-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-54D1-F
Genre: Journal Article

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Inhibited Coagulation of Micron-size Dust Due to the Electrostatic Barrier.pdf (Any fulltext), 3MB
 
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Akimkin, V. V., Author
Ivlev, A. V.1, Author              
Caselli, P.1, 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: The collisional evolution of solid material in protoplanetary disks is a crucial step in the formation of planetesimals, comets, and planets. Although dense protoplanetary environments favor fast dust coagulation, there are several factors that limit the straightforward pathway from interstellar micron-size grains to pebble-size aggregates. Apart from the grain bouncing, fragmentation, and fast drift to the central star, a notable limiting factor is the electrostatic repulsion of like-charged grains. In this study we aim at theoretical modeling of the dust coagulation coupled with the dust charging and disk ionization calculations. We show that the electrostatic barrier is a strong restraining factor to the coagulation of micrometer-size dust in dead zones of the disk (where the turbulence is suppressed). While the sustained turbulence helps to overcome the electrostatic barrier, low fractal dimensions of dust aggregates can potentially block their further coagulation even in this case. Coulomb repulsion may keep a significant fraction of small dust in the disk atmosphere and outer regions.

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 Dates: 2020-01-27
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab6299
Other: LOCALID: 3223821
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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: 889 (1) Sequence Number: 64 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3