Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-06
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the Astrophysical Journal Letters
Scientific paper
10.1086/527470
We report observations from the Spitzer Space Telescope (SST) regarding the frequency of 24 micron excess emission toward sun-like stars. Our unbiased sample is comprised of 309 stars with masses 0.7-2.2 Msun and ages from <3 Myr to >3 Gyr that lack excess emission at wavelengths <=8 microns. We identify 30 stars that exhibit clear evidence of excess emission from the observed 24/8 micron flux ratio. The implied 24 micron excesses of these candidate debris disk systems range from 13 % (the minimum detectable) to more than 100 % compared to the expected photospheric emission. The frequency of systems with evidence for dust debris emitting at 24 micron ranges from 8.5-19 % at ages <300 Myr to < 4 % for older stars. The results suggest that many, perhaps most, sun-like stars might form terrestrial planets.
Backman Dana E.
Bouwman Jeroen
Carpenter John Michael
Hillenbrand Lynne A.
Hines Dean Carter
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