Journal
ASTRONOMY & ASTROPHYSICS
Volume 422, Issue 2, Pages 621-626Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20040197
Keywords
stars : circumstellar matter; stars : planetary systems : protoplanetary disks; stars : pre-main-sequence
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We have calculated the (sub-)mm spectral indices of 26 Herbig Ae/Be stars, for which we can determine the infrared spectral energy distribution (SED). We find a clear correlation between the strength of the ratio of the near- to mid-infrared excess of these sources, and the slope of the (sub-)mm energy distribution. Based on earlier multi-dimensional modeling of disks around Herbig Ae stars, we interpret this as a correlation between the geometry of the disk (flared or self-shadowed) and the size of the grains: self-shadowed disks have, on average, larger grains than their flared counterparts. These data suggest that the geometry of a young stellar disk evolves from flared to self-shadowed.
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