Excess infrared radiation from a white dwarf—an orbiting brown dwarf?

@article{Zuckerman1987ExcessIR,
  title={Excess infrared radiation from a white dwarf—an orbiting brown dwarf?},
  author={Ben Zuckerman and Eric Edward Becklin},
  journal={Nature},
  year={1987},
  volume={330},
  pages={138-140}
}
We have discovered that the white dwarf star Giclas 29 – 38 appears to emit substantial radiation at wavelengths between 2 and 5 μm, far in excess of that expected from an extrapolation of the visual and near-infrared spectrum of the star. The infrared colour temperature of the excess radiation is 1,200±200 K and, at the distance of G29 – 38, corresponds to a total luminosity of 5 × 10−5 solar luminosities (L \cirċ ). If the excess 3.5-μm radiation is emitted by a single spherical body… 

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