TEAGUE, R.; SEMENOV, D.; GORTI, U.; GUILLOTEAU, S.; HENNING, Th.; BIRNSTIEL, T.; DUTREY, Anne; VAN BOEKEL, R.; CHAPILLON, E.

doi:10.3847/1538-4357/835/2/228

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The Astrophysical journal letters. 2017-02, vol. 835, n° 2, p. id. 228

Bristol : IOP Publishing

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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.< Réduire

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astrochemistry

ISM: molecules

protoplanetary disks

techniques: interferometric

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A Surface Density Perturbation in the TW Hydrae Disk at 95 au Traced by Molecular Emission

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