2005/01/06 by C. H. Chen, Christine Chen, M. Jura +4 · 5 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Infrared excess #Opacity #Physics #Proper motion #Spitzer Space Telescope #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/428607
published as Astrophys.J. 623 (2005) 493-501 · 12 pages, 3 figures (including 1 color figure). ApJ, in press
arxiv created 2005/01/06 · openalex publication_date 2005/04/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.