ALMA detects a radial disk wind in DG Tauri

M. Guedel, C. Eibensteiner, O. Dionatos, M. Audard, J. Forbrich, S. Kraus, Ch Rab, Ch Schneider, S. Skinner, E. Vorobyov

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Abstract

Aims. We aim to use the high spatial resolution of the Atacama Large Millimeter/submillimeter Array (ALMA) to map the flow pattern of molecular gas near DG Tauri and its disk, a young stellar object driving a jet and a molecular outflow. Methods. We use observations from ALMA in the J = 2-1 transition of 12CO, 13CO, and C 18O to study the Keplerian disk of DG Tauri and outflows that may be related to the disk and the jet. Results. We find a new wind component flowing radially at a steep angle (≈ 25° from the vertical) above the disk with a velocity of ≈ 3.1 km s -1. It continues the trend of decreasing velocity for increasing distance from the jet axis ("onion-like velocity structure"). Conclusions. The new component is located close to the protostellar disk surface and may be related to photoevaporative winds.

Original languageEnglish
Article numberL1
JournalAstronomy & Astrophysics
Volume620
Early online date23 Nov 2018
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Outflows
  • Protoplanetary disks
  • Stars: Pre-main sequence
  • Stars: Winds

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