ASpitzerStudy of Dusty Disks in the Scorpius‐Centaurus OB Association

We 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, L IR / 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.