Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40235c&link_type=abstract
Spitzer Proposal ID #40235
Computer Science
Scientific paper
The Scorpius-Centaurus OB association (ScoCen), with typical stellar distances of 115 - 145 pc, is the closest OB association to the Sun and contains three subgroups: Upper Scorpius (US), Upper Centaurus Lupus (UCL), and Lower Centaurus Crux (LCC), with estimated ages of ~5 Myr (Preibisch et al. 2002), 17 Myr, and 16 Myr (Mamajek et al. 2002), respectively. The close proximity of ScoCen and the youth of its constituent stars make this association an excellent laboratory for studying the formation and evolution of planetary systems. We propose to obtain MIPS 24 micron and 70 micron photometry of ~280 stars in UCL and LCC to complete our comprehensive survey of disks in this region and study disk evolution as a function of stellar properties. Our previous study discovered ~40 sources with 24 micron excess in a survey of 115 solar-like stars; some of which possess solid state emission features. We propose to obtain second-look IRS spectroscopy for ~35 disk systems to determine the spatial distribution of dust and search for emission features that may reveal grain composition. In addition, we request Chandra ACIS-S observations of 10 solar-like stars to resolve source confusion in the ROSAT catalog and to search for an anti-correlation between x-ray activity and infrared excess; such an anti-correlation could demonstrate that corpuscular stellar wind drag is an important grain removal mechanism around 20 Myr old solar-like stars.
Chen Christine
Jura Michael
Watson Dan
Weinberger Alycia
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