Publications of the MPIfR
Optical & Infrared
Interferometry Group
R. van Boekel, P. Ábrahám, S. Correia,
A. de Koter, C. Dominik, A. Dutrey, T. Henning, Á. Kóspál, R. Lachaume,
C. Leinert, H. Linz, M. Min, L. Mosoni, T. Preibisch, S. Quanz, T.
Ratzka, A. Schegerer, R. Waters, S. Wolf, and H. Zinnecker
Disks around young stars with VLTI/MIDI
Advances in Stellar Interferometry
Proceedings of SPIE: Vol. 6268, p.62680D-(1-19)
Danchi, W., Monnier, J., Schöller, M. (eds.)
Abstract
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 µm 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.
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