Sub-arcsecond imaging of the AB Aur molecular disk and envelope at millimeter wavelength
Authors:
          Vincent Pietu, Observatoire de Bordeaux, France
          Stephane Guilloteau, Observatoire de Bordeaux, France
          Anne Dutrey, Observatoire de Bordeaux, France

Abstract:
          We present sub-arcsecond imaging of AB Auriga obtained with the IRAM Plateau de Bure Interferometer in the isopotes of CO and in continuum at 1.3 and 3 mm. These images reveal that the circumstellar environment of AB Aur is widely different from the protoplanetary disks surrounding T Tauri stars like DM Tau or LkCa 15 or other Herbig Ae stars like MWC 480. The continuum and the isotopes lines emission show a ‘‘spiral-like’’ brightness enhancement, that prevents an accurate determination of the system inclination. Nevertheless, a robust result of our analysis is that the disk is not in Keplerian rotation. Those perturbances (spiral feature and non-Keplerian rotation) could be related to an early phase of the stellar formation or a perturbance of yet unknown origin.