IRS Search for Excess IR Emission from Solar-Type Stars

Details IRS Search for Excess IR Emission from Solar-Type Stars IRS Search for Excess IR Emission from Solar-Type Stars

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20512705b&link_type=abstract

American Astronomical Society Meeting 205, #127.05; Bulletin of the American Astronomical Society, Vol. 36, p.1554

Astronomy and Astrophysics

Astronomy

Scientific paper

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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