A Spitzer study 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 mu m. We report the detection of 14 objects that possess 24 mu m fluxes >= 30% larger than their predicted photospheres, tentatively corresponding to a disk fraction of >= 35%, including seven objects that also possess 70 mu m excesses >= 100 times larger than their predicted photospheres. The 24 mu m plus 70 mu m excess sources possess high fractional infrared luminosities, L-IR/L-* = 7 x 10(-4) to 3 x 10(-3); either they possess optically thin, dusty beta Pictoris - like disks or compact, opaque HD 98800 - like disks.