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

Chen, C. H., Jura, M., Gordon, K. D., & Blaylock, M.
2005, The Astrophysical Journal, 623, 493


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, 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.

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