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Correlation between grain growth and disk geometry in Herbig Ae/Be systems

Authors :
Acke, B.
van den Ancker, M. E.
Dullemond, C. P.
van Boekel, R.
Waters, L. B. F. M.
Acke, B.
van den Ancker, M. E.
Dullemond, C. P.
van Boekel, R.
Waters, L. B. F. M.
Source :
Astronomy and Astrophysics; August 2004, Vol. 422 Issue: 2 p621-626, 6p
Publication Year :
2004

Abstract

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.

Details

Language :
English
ISSN :
00046361 and 14320746
Volume :
422
Issue :
2
Database :
Supplemental Index
Journal :
Astronomy and Astrophysics
Publication Type :
Periodical
Accession number :
ejs53200473
Full Text :
https://doi.org/10.1051/0004-6361:20040197