Debris disks in main-sequence binary systems.

摘要: We observed 69 A3-F8 main-sequence binary star systems using the Multiband Imaging Photometer for Spitzer on board Space Telescope. find emission significantly in excess of predicted photospheric flux levels 9 % and 40 these at 24 70 μm, respectively. Twenty-two total have emission, including four that show both wavelengths. A very large fraction (nearly 60%) with small (<3 AU) separations thermal emission. interpret infrared excesses as from dust produced by collisions planetesimal belts. The incidence debris disks around binaries is marginally higher than single old AFGK stars. Whatever combination nature (birth conditions systems) nurture (interactions between two stars) drives evolution systems, it clear formation not inhibited to any great degree. model through fitting spectral energy distributions derive typical temperatures range 100-200 K fractional luminosities 10-5, parameters similar other Spitzer-discovered disks. Our calculated suggest about half we observe are derived circumbinary belts one-third clearly circumstellar material. Three dynamically unstable regions, discuss possible scenarios origin this short-lived dust.