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Title:
Mid-Infrared Spectra of Transitional Disks in the Chamaeleon I Cloud
Authors:
Kim, K. H.; Watson, Dan M.; Manoj, P.; Furlan, E.; Najita, J.; Forrest, W. J.; Sargent, B.; Espaillat, C.; Calvet, N.; Luhman, K. L.; McClure, M. K.; Green, J. D.; Harrold, Samuel T.
Affiliation:
AA(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AB(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AC(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AD(NASA Astrobiology Institute, and Department of Physics and Astronomy, UCLA, 430 Portola Plaza, Los Angeles, CA 90095, USA ; JPL, Caltech, Mail Stop 264-767, 4800 Oak Grove Drive, Pasadena, CA 91109, USA ), AE(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA ), AF(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AG(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AH(Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA ), AI(Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA ), AJ(Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA), AK(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ; Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA ), AL(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AM(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA )
Publication:
The Astrophysical Journal, Volume 700, Issue 2, pp. 1017-1025 (2009). (ApJ Homepage)
Publication Date:
08/2009
Origin:
IOP
ApJ Keywords:
infrared: stars, planetary systems: protoplanetary disks, stars: pre-main sequence
DOI:
10.1088/0004-637X/700/2/1017
Bibliographic Code:
2009ApJ...700.1017K

Abstract

We present 5-40 μm Spitzer Infrared Spectrograph spectra of a collection of transitional disks, objects for which the spectral energy distribution (SED) indicates central clearings (holes) or gaps in the dust distribution, in the Chamaeleon I star-forming region. Like their counterparts in the Taurus-Auriga star-forming region that we have previously observed, the spectra of these young objects (1-3 Myr old) reveal that the central clearings or gaps are very sharp-edged, and are surrounded by optically thick dusty disks similar to those around other classical T Tauri stars in the Chamaeleon I association. Also like the Taurus transitional disks, the Chamaeleon I transitional disks have extremely large depletion factors for small dust grains in their gaps, compared to the full accretion disks whose SEDs are represented by the median SED of Class II objects in the region. We find that the fraction of transitional disks in the Chamaeleon I cloud is somewhat higher than that in the Taurus-Auriga cloud, possibly indicating that the frequency of transitional disks, on average, increases with cluster age. We also find a significant correlation between the stellar mass and the radius of the outer edge of the gap. We discuss the disk structures implied by the spectra and the constraints they place on gap-formation mechanisms in protoplanetary disks.
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