Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21713103e&link_type=abstract
American Astronomical Society, AAS Meeting #217, #131.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Forming planets should interact with the surrounding accretion disk, clearing the material around themselves and leaving behind gaps in the disk. Stars with inner holes in their disks have been detected and are labeled as transitional objects. A few years ago, Spitzer identified a new class of "pre-transitional disks" which have gaps rather than holes - they have an inner disk, a gap, and an outer disk. In several cases, millimeter imaging has confirmed the presence of these cavities. Recently, we obtained multi-epoch Spitzer IRS spectra for a number of transitional and pre-transitional disks and find that infrared variability is a common phenomenon in such objects. Using sophisticated irradiated accretion disk models we explore the possible causes for such variability by comparing spectral energy distributions to the observations. The variability observed in transitional and pre-transitional disks has important implications on the structure of protoplanetary disks.
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