Letter to the Editor

The kinematic relationship between disk and jet in the DG Tauri system

¹ Osservatorio Astrofisico di Arcetri, INAF, Largo E. Fermi 5, 50125 Firenze, Italy
² California Institute of Technology, MS 105-24, Pasadena, CA 91125, USA
³ Dublin Institute for Advanced Studies, 5 Merrion Square Dublin 2, Ireland
⁴ Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany

Corresponding author: L. Testi, lt@arcetri.astro.it

Received: 21 August 2002
Accepted: 20 September 2002

Abstract

We present high angular resolution millimeter wavelength continuum and ¹³CO(2–1) observations of the circumstellar disk surrounding the T Tauri star DG Tauri. We show that the velocity pattern in the inner regions of the disk is consistent with Keplerian rotation about a central 0.67  star. The disk rotation is also consistent with the toroidal velocity pattern in the initial channel of the optical jet, as inferred from HST spectra of the first de-projected 100 AU from the source. Our observations support the tight relationship between disk and jet kinematics postulated by the popular magneto-centrifugal models for jet formation and collimation.