Context: The physical structure of proto-planetary disks is not yet well constrained by current observations. Millimeter interferometry is an essential tool to investigate young disks.
Aims: We study the vertical and radial temperature distribution in a few well-known disks from an observational perspective. The surface density distribution of CO and HCO+ and the scale-height are also investigated.
Methods: We report CO observations at sub-arcsecond resolution with the IRAM array of the disks surrounding MWC 480, LkCa 15, and DM Tau, and simultaneous measurements of HCO+ J = 1→ 0. To derive the disk properties, we fit a standard disk model in which all parameters are power laws of the distance to the star to the data. Possible biases associated with the method are detailed and explained. We compare the properties of the observed disks with similar objects.
Results: We find evidence for a vertical temperature gradient in the disks of
Astronomy and Astrophysics
- Pub Date:
- May 2007
- stars: circumstellar matter;
- planetary systems: protoplanetary disks;
- stars: individual: LkCa 15;
- stars: individual: MWC 480;
- stars: individual: DM Tau;
- AB Aur;
- radio lines: stars;
- Astronomy and Astrophysics (2007) accepted in 2007