Mid-infrared observations of the transitional disks around DH Tauri, DM Tauri, and GM Aurigae
Aims: We present mid-infrared observations and photometry of the transitional disks around the young stellar objects
Methods: We use the simultaneously observed standard-stars as PSF reference to constrain the radial flux profiles of our target objects. Subtracting the obtained standard-star profile from the corresponding science object profile yields the flux residuals produced by the star-disk system. A detection threshold takes into account the background standard deviation and also the seeing variations during the observations to evaluate the significance of these flux residuals. On the basis of a simple model for the dust re-emission, we derive constraints on the inner radius of the dust disk.
Results: We spatially resolve the transitional disk around GM Aur and determine an inner-disk hole radius of 20.5+1.0-0.5 AU. The circumstellar disks around DH Tau and DM Tau are not spatially resolved but we are able to constrain the inner-disk hole radius to <15.5+9.0-2.0 AU and <15.5+0.5-0.5 AU, respectively. The performed photometry yields fluxes of 178 ± 31 mJy for DH Tau, 56 ± 6 mJy for DM Tau, and 229 ± 14 mJy for GM Aur.
Astronomy and Astrophysics
- Pub Date:
- September 2011
- circumstellar matter;
- stars: pre-main sequence;
- planets and satellites: formation;
- protoplanetary disks;
- planet-disk interactions;
- stars: general;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Earth and Planetary Astrophysics
- Accepted for publication in Astronomy &