Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331804c&link_type=abstract
American Astronomical Society, AAS Meeting #213, #318.04; Bulletin of the American Astronomical Society, Vol. 41, p.297
Other
Scientific paper
We describe Spitzer IRAC and MIPS observations of the populous, 5 Myr-old open cluster NGC 2362. Combining these data with 2MASS near IR photometry, we analyze the mid-IR colors of cluster members. Optical/infrared photometry through 24 microns is used to constrain the spectral energy distributions of cluster stars, comparing them to star+circumstellar disk models covering a range of disk morphologies and evolutionary states.
Early/intermediate-type (candidate) cluster members either have photospheric mid-IR emission or weak, optically-thin infrared excess emission at > 24 microns, consistent with debris disks. Few late-type, solar/subsolar-mass stars have primordial disks. The disk population around late-type stars is dominated by 'transition' disks and 'homologously depleted' disks. Both types of disks represent an intermediate stage between primordial disks and debris disks, so multiple paths for primordial-to-debris disk transition exist. Because evolved primordial disks greatly outnumber primordial disks, these results undermine standard arguments in favor of a < 10^5 year timescale for the transition based on the paucity of 'transition' disks in Taurus-Auriga. Combining our data with that from other Spitzer surveys, we investigate the evolution of debris disks around high/intermediate-mass stars and constrain the timescale for gas giant planet formation. The formation timescale for gas giant planets surrounding early-type, high/intermediate-mass stars must be << 5 Myr. Most solar/subsolar-mass stars detected by Spitzer have SEDs that indicate their disks have evolved past the primordial disk phase. Thus, gas giant planet formation must occur prior to 5 Myr around stars with a wide range of masses.
Currie Thayne M.
Irwin Jonathan
Kenyon Scott. J.
Lada Charles J.
Plavchan Peter
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