Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20124l&link_type=abstract
Spitzer Proposal ID #20124
Physics
Scientific paper
Spitzer observations of the 25 Myr old stellar cluster NGC 2547 has provided us with an initial census of the disk population in the cluster. Of the candidate member sources, selected using optical and near-infrared ground-based photometry, only 5% show some excess emission in the IRAC bands suggestive of the presence of primordial or protoplanetary disks, although no excess emission is detected at near-infrared wavelengths for these sources. These objects are late type (SpT > K) and the lowest mass members of the cluster. The MIPS observations (specifically 24um band) have detected photospheres of all the A-type stars in the cluster and we have determined that 20% of these have excess emission at 24um. Thus by 25 Myr a significant number of debris disks have developed around A-type stars. Debris disk fractions are highly desirable in order to investigate planet formation around later-type stars but cannot be determined unless we obtain deeper observations at 24um. In order to aquire a better census of debris disks for cluster members of lower mass and later spectral type we propose to obtain deeper MIPS observations of NGC 2547.
lada Charles
Teixeira Paula
Young Erick
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