Volume 422, Number 2, August I 2004
|Page(s)||621 - 626|
|Section||Interstellar and circumstellar matter|
|Published online||09 July 2004|
Correlation between grain growth and disk geometry in Herbig Ae/Be systems
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium e-mail: firstname.lastname@example.org
2 European Southern Observatory, Karl-Schwarzschild Strasse 2, 85748 Garching bei München, Germany
3 Max-Planck-Institut für Astrophysik, Karl-Schwarzschildstrasse 1, Postfach 1317, 85748 Garching bei München, Germany
4 Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
Accepted: 24 April 2004
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.
Key words: stars: circumstellar matter / stars: planetary systems: protoplanetary disks / stars: pre-main-sequence
© ESO, 2004
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