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

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

2005-01-06

arxiv.org/abs/astro-ph/0501103v1

Astrophys.J. 623 (2005) 493-501

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures (including 1 color figure). ApJ, in press

Scientific paper

10.1086/428607

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.

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