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Title:
Debris Disks around Sun-like Stars
Authors:
Trilling, D. E.; Bryden, G.; Beichman, C. A.; Rieke, G. H.; Su, K. Y. L.; Stansberry, J. A.; Blaylock, M.; Stapelfeldt, K. R.; Beeman, J. W.; Haller, E. E.
Affiliation:
AA(Steward Observatory, 933 North Cherry Avenue, The University of Arizona, Tucson, AZ 85721; .), AB(Jet Propulsion Laboratory, Caltech, 4800 Oak Grove Drive, Pasadena, CA 91109.), AC(Jet Propulsion Laboratory, Caltech, 4800 Oak Grove Drive, Pasadena, CA 91109.), AD(Steward Observatory, 933 North Cherry Avenue, The University of Arizona, Tucson, AZ 85721; .), AE(Steward Observatory, 933 North Cherry Avenue, The University of Arizona, Tucson, AZ 85721; .), AF(Steward Observatory, 933 North Cherry Avenue, The University of Arizona, Tucson, AZ 85721; .), AG(Steward Observatory, 933 North Cherry Avenue, The University of Arizona, Tucson, AZ 85721; .), AH(Jet Propulsion Laboratory, Caltech, 4800 Oak Grove Drive, Pasadena, CA 91109.), AI(Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AJ(Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Department of Materials Science and Engineering, University of California, Berkeley, CA 94720.)
Publication:
The Astrophysical Journal, Volume 674, Issue 2, pp. 1086-1105. (ApJ Homepage)
Publication Date:
02/2008
Origin:
UCP
ApJ Keywords:
Stars: Circumstellar Matter, Infrared: Stars, Stars: Planetary Systems: Formation
Abstract Copyright:
(c) 2008: The American Astronomical Society
DOI:
10.1086/525514
Bibliographic Code:
2008ApJ...674.1086T

Abstract

We have observed nearly 200 FGK stars at 24 and 70 μm with the Spitzer Space Telescope. We identify excess infrared emission, including a number of cases where the observed flux is more than 10 times brighter than the predicted photospheric flux, and interpret these signatures as evidence of debris disks in those systems. We combine this sample of FGK stars with similar published results to produce a sample of more than 350 main sequence AFGKM stars. The incidence of debris disks is 4.2+2.0-1.1% at 24 μm for a sample of 213 Sun-like (FG) stars and 16.4+2.8-2.9% at 70 μm for 225 Sun-like (FG) stars. We find that the excess rates for A, F, G, and K stars are statistically indistinguishable, but with a suggestion of decreasing excess rate toward the later spectral types; this may be an age effect. The lack of strong trend among FGK stars of comparable ages is surprising, given the factor of 50 change in stellar luminosity across this spectral range. We also find that the incidence of debris disks declines very slowly beyond ages of 1 billion years.
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