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

Metadatos

Mostrar el registro completo del ítem

Licencia de uso del documento

Idioma

Article de revue

Este ítem está publicado en

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

Bristol : IOP Publishing

Resumen en inglés

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.< Leer menos

Palabras clave en inglés

astrochemistry

ISM: molecules

protoplanetary disks

techniques: interferometric

Metadatos

Licencia de uso del documento

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

Idioma

Este ítem está publicado en

Resumen en inglés

Palabras clave en inglés

DOI

Orígen

Centros de investigación