Spitzer IRAC Observations of White Dwarfs. I. Warm Dust at Metal-Rich Degenerates

@article{Farihi2008SpitzerIO,
  title={Spitzer IRAC Observations of White Dwarfs. I. Warm Dust at Metal-Rich Degenerates},
  author={Jay Farihi and Ben Zuckerman and Eric Edward Becklin},
  journal={The Astrophysical Journal},
  year={2008},
  volume={674},
  pages={431-446}
}
This paper presents the results of a Spitzer IRAC 3-8 μm photometric search for warm dust orbiting 17 nearby, metal-rich white dwarfs, 15 of which apparently have hydrogen-dominated atmospheres (type DAZ). G166-58, G29-38, and GD 362 manifest excess emission in their IRAC fluxes and the latter two are known to harbor dust grains warm enough to radiate detectable emission at near-infrared wavelengths as short as 2 μm. Their IRAC fluxes display differences compatible with a relatively larger… Expand
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