C. H. Chen et al. 2005 ApJ 623 493 doi:10.1086/428607
C. H. Chen1, M. Jura2, K. D. Gordon3 and M. Blaylock3
Show affiliationsWe have obtained Spitzer Space Telescope MIPS observations of 40 F- and G-type common proper motion members of the Scorpius-Centaurus OB association with ages between 5 and 20 Myr at 24 and 70 μm. We report the detection of 14 objects that possess 24 μm fluxes ≥30% larger than their predicted photospheres, tentatively corresponding to a disk fraction of ≥35%, including seven objects that also possess 70 μm excesses ≥100 times larger than their predicted photospheres. The 24 μm plus 70 μm excess sources possess high fractional infrared luminosities, LIR/L* = 7 × 10-4 to 3 × 10-3; either they possess optically thin, dusty β Pictoris-like disks or compact, opaque HD 98800-like disks.
circumstellar matter; open clusters and associations: individual (Sco-Cen Association); planetary systems: formation
Issue 1 (2005 April 10)
Received 2004 October 26, accepted for publication 2004 December 30
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