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dc.contributor.authorTEAGUE, R.
dc.contributor.authorSEMENOV, D.
dc.contributor.authorGORTI, U.
hal.structure.identifierAMOR 2017
dc.contributor.authorGUILLOTEAU, S.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorHENNING, Th.
dc.contributor.authorBIRNSTIEL, T.
hal.structure.identifierAMOR 2017
dc.contributor.authorDUTREY, Anne
hal.structure.identifierAstronomical Institute Anton Pannekoek [AI PANNEKOEK]
dc.contributor.authorVAN BOEKEL, R.
hal.structure.identifierAMOR 2017
dc.contributor.authorCHAPILLON, E.
dc.date.issued2017-02
dc.identifier.issn2041-8205
dc.description.abstractEnWe 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.
dc.language.isoen
dc.publisherBristol : IOP Publishing
dc.subject.enastrochemistry
dc.subject.enISM: molecules
dc.subject.enprotoplanetary disks
dc.subject.entechniques: interferometric
dc.title.enA Surface Density Perturbation in the TW Hydrae Disk at 95 au Traced by Molecular Emission
dc.typeArticle de revue
dc.identifier.doi10.3847/1538-4357/835/2/228
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1702.02147
bordeaux.journalThe Astrophysical journal letters
bordeaux.pageid. 228
bordeaux.volume835
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-01462872
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01462872v1
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