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 Title: 

            Spitzer Space Telescope Imaging of Spatially Resolved Debris Disks

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 Authors:

          Karl Stapelfeldt, JPL/Caltech

          Kate Su, Arizona

          Michael Werner, JPL/Caltech

          George Rieke, Arizona

          Massimo Marengo, CfA

          Christine Chen, JPL/NOAO

          Tom Megeath, CfA

          Dan Watson, U. of Rochester

          Michael Jura, UCLA

          Dean Hines, SSI

          Chas Beichman, MSC/Caltech

          John Stansberry, Arizona

          Jeff van Cleve, Ball

          David Trilling, Arizona

          Dana Backman, NASA/Ames

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 Abstract:

          We present a progress report on Spitzer imaging and spectroscopy of bright,nearby debris disks.  The Fomalhaut and epsilon Eridani disks, which appear as rings in submillimeter maps, have their central regions partially filled in by warm dust in MIPS images.  The Vega disk appears surprisingly large, diffuse, and axisymmetric in the far-infrared, consistent with blowout of small dust grains.  Disk asymmetries observed in Fomalhaut may indicate dynamical perturbations from unseen planets.  Limits on substellar companions to the debris disk sources are reported from deep IRAC imaging.  Results from these studies of resolved disks will form the foundation for understanding the multitude of other debris disks that Spitzer will detect photometrically.

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