Letter to the Editor
ALMA detects a radial disk wind in DG Tauri⋆
University of Vienna, Dept. of Astrophysics, Türkenschanzstr. 17, 1180 Vienna, Austria
2 Department of Astronomy, University of Geneva, Ch. d’Ecogia 16, 1290 Versoix, Switzerland
3 University of Hertfordshire, Hatfield, Hertfordshire, UK
4 University of Exeter, School of Physics and Astronomy, Stocker Road, Exeter EX4 4QL, UK
5 Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
6 Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
7 Center for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, CO 80309-0389, USA
8 Research Institute of Physics, Southern Federal University, Stachki Ave. 194, Rostov-on-Don, Russia
Accepted: 20 October 2018
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 C18O 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.
Key words: stars: pre-main sequence / stars: winds / outflows / protoplanetary disks
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