INFRARED SIGNATURES OF DISRUPTED MINOR PLANETS AT WHITE DWARFS

@article{Farihi2009INFRAREDSO,
  title={INFRARED SIGNATURES OF DISRUPTED MINOR PLANETS AT WHITE DWARFS},
  author={Jay Farihi and M. Jura and Ben Zuckerman},
  journal={The Astrophysical Journal},
  year={2009},
  volume={694},
  pages={805 - 819}
}
Spitzer Space Observatory IRAC and MIPS photometric observations are presented for 20 white dwarfs with Teff ≲ 20, 000 K and metal-contaminated photospheres. A warm circumstellar disk is detected at GD 16 and likely at PG 1457−086, while the remaining targets fail to reveal mid-infrared excess typical of dust disks, including a number of heavily polluted stars. Extending previous studies, over 50% of all single white dwarfs with implied metal-accretion rates dM/dt≳ 3 × 108 g s−1 display a warm… 

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