Debris disks around Sun-like stars

被引：237

作者：

Trilling, D. E. ^{[1
]}

Bryden, G. ^{[2
]}

Beichman, C. A. ^{[2
]}

Rieke, G. H. ^{[1
]}

Su, K. Y. L. ^{[1
]}

Stansberry, J. A. ^{[1
]}

Blaylock, M. ^{[1
]}

Stapelfeldt, K. R. ^{[2
]}

Beeman, J. W. ^{[3
]}

Haller, E. E. ^{[3
,4
]}

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[2] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[3] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 674卷 / 02期

关键词：

circumstellar matter; infrared : stars; planetary systems : formation;

D O I：

10.1086/525514

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have observed nearly 200 FGK stars at 24 and 70 mu m 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(-1.1)(+2.0)% at 24 mu m for a sample of 213 Sun-like (FG) stars and 16.4(-2.9)(+2.8)% at 70 mu m 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.

引用

页码：1086 / 1105

页数：20

共 70 条

[1] Broad-band JHK(L′) photometry of a sample of giants with 0.5>[Fe/H]>-3 [J].