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24 April 2024 |
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Debris disks around Sun-like star | | D. E. Trilling
; G. Bryden
; C. A. Beichman
; G. H. Rieke
; K. Y. L. Su
; J. A. Stansberry
; M. Blaylock
; K. R. Stapelfeldt
; J. W. Beeman
; E. E. Haller
; | | Date: |
29 Oct 2007 | | Abstract: | We have observed nearly 200 FGK stars at 24 and 70 microns 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 microns for a sample of 213
Sun-like (FG) stars and 16.4% (+2.8/-2.9) at 70 microns 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. | | Source: | arXiv, 0710.5498 | | Services: | Forum | Review | PDF | Favorites | |
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