Debris Disks in Main-Sequence Binary Systems

We observed 69 A3-F8 main-sequence binary star systems using the Multiband Imaging Photometer for Spitzer on board the Spitzer Space Telescope. We find emission significantly in excess of predicted photospheric flux levels for 9 super(+4-3)% and 40 super(+7-6)% of these systems at 24 and 70 km, resp...

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Published in:The Astrophysical journal 2007-04, Vol.658 (2), p.1289-1311
Main Authors: Trilling, D. E, Stansberry, J. A, Stapelfeldt, K. R, Rieke, G. H, Su, K. Y. L, Gray, R. O, Corbally, C. J, Bryden, G, Chen, C. H, Boden, A, Beichman, C. A
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creator Trilling, D. E
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Chen, C. H
Boden, A
Beichman, C. A
description We observed 69 A3-F8 main-sequence binary star systems using the Multiband Imaging Photometer for Spitzer on board the Spitzer Space Telescope. We find emission significantly in excess of predicted photospheric flux levels for 9 super(+4-3)% and 40 super(+7-6)% of these systems at 24 and 70 km, respectively. Twenty-two systems total have excess emission, including four systems that show excess emission at both wavelengths. A very large fraction (nearly 60%) of observed binary systems with small (
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We interpret the observed infrared excesses as thermal emission from dust produced by collisions in planetesimal belts. The incidence of debris disks around main-sequence A3-F8 binaries is marginally higher than that for single old AFGK stars. Whatever combination of nature (birth conditions of binary systems) and nurture (interactions between the two stars) drives the evolution of debris disks in binary systems, it is clear that planetesimal formation is not inhibited to any great degree. We model these dust disks through fitting the spectral energy distributions and derive typical dust temperatures in the range 100-200 K and typical fractional luminosities around 10 super(-5), with both parameters similar to other Spitzer-discovered debris disks. Our calculated dust temperatures suggest that about half the excesses we observe are derived from circumbinary planetesimal belts and around one-third of the excesses clearly suggest circumstellar material. 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title Debris Disks in Main-Sequence Binary Systems
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