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**FULL TITLE** ASP Conference Series, Vol. **VOLUME**, **YEAR OF PUBLICATION** **NAMES OF EDITORS** Spitzer Search for Mid-IR excesses Around Five DAZs

By John H. Debes and Steinn Sigurdsson


Abstract. Hydrogen atmosphere white dwarfs with metals, so-called DAZs, require external accretion of material to explain the presence of weak metal line absorption in their photospheres. The source of this material is currently uknown, but could come from the interstellar medium, unseen companions, or relic planetesimals from asteroid belt or Kuiper belt analogues. Mid-infrared photometry of these white dwarfs provide additional information to solve the mystery of this accretion and to look for evidence of planetary systems that have survived post main sequence evolution. We present Spitzer IRAC photometry of five DAZs and search for excesses due to unseen companions or circumstellar dust disks. Three of our targets show unexpected deficits in flux, which we tentatively attribute to absorption due to SiO and CO. 1

Year: 2007
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