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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742729.0, MPI für Astronomie / Publikationen_mpia
A Three-dimensional View of Turbulence: Constraints on Turbulent Motions in the HD 163296 Protoplanetary Disk Using DCO+
Authors:Flaherty, K. M.; Hughes, A. M.; Rose, S. C.; Simon, J. B.; Qi, C.; Andrews, S. M.; Kóspál, Á.; Wilner, D. J.; Chiang, E.; Armitage, P. J.; Bai, X.-n.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 150 (20 pp)
Audience:Not Specified
Abstract / Description:Gas kinematics are an important part of the planet formation process. Turbulence influences planetesimal growth and migration from the scale of submicron dust grains through gas-giant planets. Radio observations of resolved molecular line emission can directly measure this non-thermal motion and, taking advantage of the layered chemical structure of disks, different molecular lines can be combined to map the turbulence throughout the vertical extent of a protoplanetary disk. Here we present ALMA observations of three molecules (DCO+(3-2), C18O(2-1) and CO(2-1)) from the disk around HD 163296. We are able to place stringent upper limits (v turb < 0.06c s , <0.05c s , and <0.04c s for CO(2-1), C18O(2-1), and DCO+(3-2) respectively), corresponding to α ≲ 3 × 10‑3, similar to our prior limit derived from CO(3-2). This indicates that there is little turbulence throughout the vertical extent of the disk, contrary to theoretical predictions based on the magnetorotational instability and gravitoturbulence. In modeling the DCO+ emission, we also find that it is confined to three concentric rings at 65.7 ± 0.9 au, {149.9}-0.7+0.5 {au}, and 259 ± 1 au, indicative of a complex chemical environment.
Free Keywords:accretion; accretion disks; protoplanetary disks; stars: individual: HD 163296; turbulence
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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