The Enigma of DG Tau: Silicate Emission Variability
Abstract
We discuss results of our multi-epoch HIFOGS moderate resolution 10 micron spectroscopy and DUSTY+DISK modeling of the highly photometrically active T Tauri star, DG Tau. Of note, DG Tau has exhibited significant temporal variability of the 10 micron silicate feature -- specifically no feature for decades, to emission feature for 2 years, to no feature 2 months later, to absorption feature for 3 years, to no feature, to (?) emission feature -- that is unique among PMS objects. This temporal sequence of events, combined with our 1-23 micron photometric monitoring and additional mid-infrared (IR) spectroscopy by BASS, places stringent limitations on the disk, disk-envelope geometry, and directly permits us to probe dust processes in the inner 50 to 100 AU of the disk.
- Publication:
-
Debris Disks and the Formation of Planets
- Pub Date:
- December 2004
- Bibcode:
- 2004ASPC..324..224W