Volume 533, September 2011
|Number of page(s)||6|
|Section||Interstellar and circumstellar matter|
|Published online||01 September 2011|
Mid-infrared observations of the transitional disks around DH Tauri, DM Tauri, and GM Aurigae⋆
University of Kiel, Institute of Theoretical Physics and
2 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Received: 14 October 2010
Accepted: 27 July 2011
Aims. We present mid-infrared observations and photometry of the transitional disks around the young stellar objects DH Tau, DM Tau, and GM Aur, obtained with VISIR/VLT in N band. Our aim is to resolve the inner region and the large-scale structures of these transitional disks, carrying potential signatures of intermediate or later stages of disk evolution and ongoing planet formation.
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 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 < AU and < 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.
Key words: circumstellar matter / stars: pre-main sequence / planets and satellites: formation / protoplanetary disks / planet-disk interactions / stars: general
© ESO, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.