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

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

2004-04-28

arxiv.org/abs/astro-ph/0404553v1

Astron.Astrophys. 422 (2004) 621-626

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, A&A accepted

Scientific paper

10.1051/0004-6361:20040197

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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