Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0801k&link_type=abstract
American Astronomical Society Meeting 208, #8.01; Bulletin of the American Astronomical Society, Vol. 38, p.86
Other
Scientific paper
We present 5-40 micron Spitzer-IRS spectra of a collection of transitional disks in Cha I star-formation region: objects for which the spectral energy distribution indicates central clearings or radial gaps in the dust distribution. Like their counterparts in Taurus that we have previously observed, the spectra of these young objects (1-2 Myr old) reveal that the central clearings are very sharp-edged, and are surrounded by optically-thick dusty disks similar to those around other classical T Tau stars in Cha I. Also like the Taurus transitional disks, the present transitional disks have extremely small depletion factors for small dust grains in their central clearings, relative to disks with SEDs resembling the median for these associations. We discuss the details of the disk structure implied by the spectra, and the constraints the results place on mechanisms by which central and radial gaps in young protoplanetary disks can form.We also show that transitional disks with such severely dust-depleted central clearings comprise a significantly larger fraction of the Class II YSO population in Cha I than in Taurus, and we will discuss the possible origin of this difference in the ages and environment of the two star-forming cloud complexes.
Bohac Chris
Calvet Nuria
Chen Chian-Chou
D'Alessio Paola
Forrest Bradley
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