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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 742414.0, MPI für Astronomie / Publikationen_mpia
A surface density perturbation in the TW Hydraedisk at 95 au traced by molecular emission
Authors:Teague, R.; Semenov, D.; Gorti, U.; Guilloteau, S.; Henning, T.; Birnstiel, T.; Dutrey, A.; van Boekel, R.; Chapillon, E.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal
Volume:835
Issue / Number:2
Start Page:id. 228 (12 pp)
Audience:Not Specified
Abstract / Description:We present ALMA Cycle 2 observations at 0.″5 resolution of TW Hya of CS J=5-4 emission. The radial profile of the integrated line emission displays oscillatory features outward of 1.″5 (≈ 90 au). A dip-like feature at 1.″6 is coincident in location, depth, and width with features observed in dust scattered light at near-infrared wavelengths. Using a thermochemical model indicative of TW Hya, gas-grain chemical modeling, and non-LTE radiative transfer, we demonstrate that such a feature can be reproduced with a surface density depression, consistent with the modeling performed for scattered-light observations of TW Hya. We further demonstrate that a gap in the dust distribution and dust opacity only cannot reproduce the observed CS feature. The outer enhancement at 3.″1 is identified as a region of intensified desorption due to enhanced penetration of the interstellar far-UV radiation at the exponential edge of the disk surface density, which intensifies the photochemical processing of gas and ices.
Free Keywords:astrochemistry; ISM: molecules; protoplanetary disks; techniques: interferometric
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X
URL:http://adsabs.harvard.edu/abs/2017ApJ...835..228T
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