We carried out a homogeneous data processing and analysis of 82 low-
and intermediate-mass young stellar objects observed with the MIDI
instrument on the VLT interferometer. From a geometric disk modeling
we found, that the mid-infrared size of the disks scales with the
stellar luminosity, although the correlation is much weaker than in
the near-infrared. This suggests that the 1-10 au disk region has more
diverse structure than the inner 1 au region. Once we account for
differences in stellar luminosity, the disks around T Tauri stars are
generally colder and more extended, than disks around Herbig Ae stars.
The interferometric measurements on the profile and amplitude of the
10 micrometer silicate spectral feature revealed that the dust in the
inner disk is more processed (coagulated, crystallized). T Tauri stars
typically show weaker silicate emission than Herbig Ae stars, which
may indicate that the disk flaring is less pronounced.
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