Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.5401b&link_type=abstract
American Astronomical Society, DPS meeting #38, #54.01; Bulletin of the American Astronomical Society, Vol. 38, p.583
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The Spitzer Space Telescope has surveyed 300 nearby solar-type stars for IR excess, with a detection rate of 15%. Among these stars with circumstellar dust emission, we identify 11 as marginally resolved in their MIPS 70um images. Beyond the ``Fabulous Four'' discovered by IRAS, these are the only debris disks that have been spatially resolved by Spitzer. Several have independent evidence for disk extension, most notably the four disks previously resolved with the Hubble Space Telescope; the thermal emission observed by Spitzer matches these scattered light images in both size and position angle. In a fifth case, the Spitzer observations correctly predict these disk parameters, as confirmed by subsequent HST imaging. Overall, by resolving the thermal emission, we place constraints on the dust properties and on the orbital location of larger colliding planetesimals.
Beichman Ch.
Bryden Geoffrey
Rieke George
Stapelfeldt Karl
Tanner Alan
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