Spitzer Search for Mid-IR Excesses Around Five DAZs

Details Spitzer Search for Mid-IR Excesses Around Five DAZs Spitzer Search for Mid-IR Excesses Around Five DAZs

2007-03-16

arxiv.org/abs/astro-ph/0703448v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, 15th European WD conference

Scientific paper

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 {\em Spitzer} IRAC photometry of five DAZs and search for excesses due to unseen companions or circumstellar dust disks. Three of our targets show unexpected {\em deficits} in flux, which we tentatively attribute to absorption due to SiO and CO.

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