ALMA detects a radial disk wind in DG Tauri
Audard, M.; Güdel, M.; Vorobyov, E.; Forbrich, J.; Dionatos, O.; Eibensteiner, C.; Kraus, S.; Rab, Ch.; Schneider, Ch.; Skinner, S.
Austria, Switzerland, United Kingdom, Netherlands, Germany, United States, Russia
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 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.