A Spitzer Study of Dusty Disks in the Scorpius-Centaurus OB Association

Abstract

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 micron and 70 micron. We report the detection of fourteen objects which possess 24 micron fluxes >30% larger than their predicted photospheres, tentatively corresponding to a disk fraction of >35%, including seven objects which also possess 70 micron excesses >100 times larger than their predicted photospheres. The 24 micron plus 70 micron excess sources possess high fractional infrared luminosities, LIR/L* = 7.0e-4 - 3.0e-3; either they possess optically thin, dusty beta Pictoris-like disks or compact, opaque HD 98800-like disks.