Tracking Dust Grains during Transport and Growth in Protoplanetary Disks
AffiliationUniv Arizona, Dept Astron, Steward Observ
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationWilliam Misener et al 2019 ApJ 885 118
RightsCopyright © 2019. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractProtoplanetary disks are dynamic objects, within which dust grains and gas are expected to be redistributed over large distances. Evidence for this redistribution is seen both in other protoplanetary disks and in our own solar system, with high-temperature materials thought to originate close to the central star found in the cold, outer regions of the disks. While models have shown this redistribution is possible through a variety of mechanisms, these models have generally ignored the possible growth of solids via grain–grain collisions that would occur during transit. Here we investigate the interplay of coagulation and radial and vertical transport of solids in protoplanetary disks, considering cases where growth is limited by bouncing or by fragmentation. We find that, in all cases, growth effectively limits the facility for materials to be carried outward or preserved at large distances from the star. This is due to solids being incorporated into large aggregates which drift inward rapidly under the effects of gas drag. We discuss the implications for mixing in protoplanetary disks, and how the preservation of high-temperature materials in outer disks may require structures or outward flow patterns to avoid them being lost via radial drift.
VersionFinal published version
SponsorsNASANational Aeronautics & Space Administration (NASA) [NNX14AQ17G, NNX15AD94G, NAS 5-26555]; Hubble Fellowship Program by NASA through a grant from the Space Telescope Science Institute [HST-HF2-51394.002-A]; National Aeronautics and Space AdministrationNational Aeronautics & Space Administration (NASA) [NNX15AD94G]; NASA's Science Mission Directorate