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

  title={A Surface Density Perturbation in the TW Hydrae Disk at 95 au Traced by Molecular Emission},
  author={Richard Teague and Dmitry A Semenov and Uma Gorti and St{\'e}phane Guilloteau and Th. Henning and Tilman Birnstiel and A. Dutrey and Roy van Boekel and Edwige Chapillon},
  journal={The Astrophysical Journal},
We present ALMA Cycle 2 observations at 0.″5 resolution of TW Hya of CS emission. The radial profile of the integrated line emission displays oscillatory features outward of 1.″5 ( 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… 

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