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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308542.0, MPI für Astronomie / Publikationen_mpia
Disks around young stars with VLTI/MIDI
Authors:van Boekel, R.; Ábrahám, P.; Correia, S.; de Koter, A.; Dominik, C.; Dutrey, A.; Henning, T.; Kóspál, Á.; Lachaume, R.; Leinert, C.; Linz, H.; Min, M.; Mosoni, L.; Preibisch, T.; Quanz, S.; Ratzka, T.; Schegerer, A.; Waters, R.; Wolf, S.; Zinnecker, H.
Date of Publication (YYYY-MM-DD):2006
Title of Proceedings:Advances in Stellar Interferometry
Start Page:62680C-1
End Page:19
Volume (in Series):6268
Name of Conference/Meeting:Advances in Stellar Interferometry
Audience:Not Specified
Abstract / Description:We report on observations of circumstellar disks around young stars that have been obtained with the MIDI instrument, which is mounted on the VLT Interferometer and operates in the 10 mum atmospheric window. The maximum spatial resolution of 5 milli-arcsec corresponds to sub-AU scales at the distance to nearby star formation regions. Thus, we can study the disks on the spatial scales at which important processes occur, such as accretion, dust processing, and planet formation. The main results obtained so far can be summarized as follows: 1. The measured interferometric visibilities are in good qualitative agreement with those predicted by models of circumstellar disks. In particular, a predicted correlation between the strength of the far-infrared excess and the spatial structure of the disk is confirmed by direct measurements; 2. In several objects strong evidence for deviations from circular symmetry is present, indicating that an inclined disk is indeed the dominant component seen in the mid-infrared; 3. The dust properties are not uniform over the disk, but are instead a strong function of distance to the central star. The dust in the innermost disk regions is observed to be more "processed" than the dust further out, both in Herbig Ae star disks and in those around T Tauri stars.
Comment of the Author/Creator:Date: 2006, July 1, 2006
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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