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

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3803c&link_type=abstract

American Astronomical Society, ESS meeting #2, #38.03

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Scientific paper

We obtained Spitzer Space Telescope Multiband Imaging Photometer for
Spitzer (MIPS) 24 micron and 70 micron observations of 183 nearby, Hipparcos F- and G-type common proper motion single and binary systems in the nearest OB association, Scorpius-Centaurus. We also obtained Magellan/MIKE R 50,000 visual spectra at 3500 - 10500 Angstrom for 181 candidate ScoCen stars in single and binary systems. Combining our MIPS observations with those of other ScoCen stars in the literature, we estimate 24 micron F+G-type disk fractions of 9/27 (33% ± 11%), 23/68 (34% ± 7%), and 22/71 (31% ± 7%) for Upper Scorpius ( 10 Myr), Upper Centaurus Lupus ( 15 Myr), and Lower Centaurus Crux ( 17 Myr), respectively. We confirm previous IRAS and MIPS excess detections and present new discoveries of 41 proto-planetary and debris disk systems, with fractional infrared luminosities ranging from LIR/L* = 10-5 - 10-2 and grain temperatures ranging from Tgr = 40 - 300 K. We searched for an increase in 24 micron excess at an age of 15-20 Myr, consistent with the onset of debris production predicted by coagulation N-body simulations of outer planetary systems. We found such an increase around 1.5 Msun stars but discovered a decrease in the 24 micron excess around 1.0 Msunstars. We additionally discovered that the 24 micron excess around 1.0 Msun stars is larger than predicted by self-stirred models. Finally, we found a weak anti-correlation between fractional infrared luminosity (LIR/L*) and chromospheric activity (R'HK), that may be the result of differences in stellar luminosity and/or activity.

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