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Paper: The Enigma of DG Tau: Silicate Emission Variability
Volume: 324, Debris Disks and the Formation of Planets: A Symposium in Memory of Fred Gillett
Page: 224
Authors: Woodward, C.E.; Wooden, D.H.; Harker, D.E.; Bell, K.R.; Butner, H.M.; Sitko, M.L.; Lynch, D.; Russell, R.
Abstract: We discuss results of our multi-epoch HIFOGS moderate resolution 10 μm 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.
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