AAS 205th Meeting, 9-13 January 2005
Session 127 Circumstellar Disks and the Origin of the Solar System
Oral, Wednesday, January 12, 2005, 2:00-3:30pm, Golden Ballroom

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[127.05] IRS Search for Excess IR Emission from Solar-Type Stars

C. A. Beichman, G. Bryden, M. Werner, K. Stapelfeldt (JPL), G. Rieke, J. Stansberry, D. Trilling, K. Misselt, K. Y. L. Su (Univ. of Arizona)

We've used the InfraRed Spectrograph (IRS) on the Spitzer Space Telescope to examine a sample of 45 F5-K5 main-sequence dwarf stars, looking for emission above the stellar photosphere. The three modules used (Short-Low 1, Long-Low 1, and Long-Low 2) cover each stellar spectra from 8 to 35 um. Observations made during the first six months of Spitzer's mission have been reduced with careful flat-fielding in order to remove residual pixel-to-pixel calibration problems down to <3%. In most cases, the lack of a detected excess rules out the presence of hot (100-1000K) dust at the level of 100-1000 times our zodiacal cloud. Around one star, a nearby K dwarf, we've found prominent dust emission indicative of small, crystalline grains that must be located within 1 AU of the star. We will discuss possible asteroidal or cometary origins for this dust.

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© 2004. The American Astronomical Society.