Infrared Emission from the Dusty Disk Orbiting GD 362, an Externally Polluted White Dwarf

@article{Jura2007InfraredEF,
  title={Infrared Emission from the Dusty Disk Orbiting GD 362, an Externally Polluted White Dwarf},
  author={M. Jura and Jay Farihi and Ben Zuckerman and Eric Edward Becklin},
  journal={The Astronomical Journal},
  year={2007},
  volume={133},
  pages={1927 - 1933}
}
We report Spitzer Space Telescope photometry between 3.6 and 24 μm and spectroscopy between 5 and 15 μm of GD 362, a white dwarf with an effective temperature near 10,000 K that displays a remarkably high concentration of metals in its photosphere and a thermal infrared excess. We approximately reproduce both the infrared continuum and the very strong 10 μm silicate emission feature with a model of an orbiting dusty disk that is flat out to 50 stellar radii and warped between 50 and 70 stellar… 

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References

SHOWING 1-10 OF 44 REFERENCES

A Dusty Disk around GD 362, a White Dwarf with a Uniquely High Photospheric Metal Abundance

Eighteen years after an infrared excess was discovered associated with the white dwarf G29-38, we report ground-based measurements (JHKsKL′N′) with millijansky-level sensitivity of GD 362 that show

The Dust Cloud around the White Dwarf G29-38

We present new observations of the white dwarf G29-38 with the camera (4.5 and 8 μm), photometer (24 μm), and spectrograph (5.5-14 μm) of the Spitzer Space Telescope. This star has an exceptionally

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

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

A Tidally Disrupted Asteroid around the White Dwarf G29-38

The infrared excess around the white dwarf G29-38 can be explained by emission from an opaque flat ring of dust with an inner radius of 0.14 R☉ and an outer radius of less than 1 R☉. This ring lies

Excess Infrared Radiation from the Massive DAZ White Dwarf GD 362: A Debris Disk?

We report the discovery of excess K-band radiation from the massive DAZ white dwarf star GD 362. Combining infrared photometric and spectroscopic observations, we show that the excess radiation

Spectral Energy Distributions of T Tauri Stars with Passive Circumstellar Disks

We derive hydrostatic, radiative equilibrium models for passive disks surrounding T Tauri stars. Each disk is encased by an optically thin layer of superheated dust grains. This layer reemits

The Mystery Deepens: Spitzer Observations of Cool White Dwarfs

We present 4.5 and 8 μm photometric observations of 18 cool white dwarfs obtained with the Spitzer Space Telescope. Our observations demonstrate that four white dwarfs with Teff < 6000 K show

The infrared and optical pulsations of G29-38

High-speed infrared photometry at 1.25, 2.2, and 3.5 microns of the pulsating white dwarf G29 - 38 reveals the presence of unexpectedly large amplitude signals at 2.2 microns, with periods of 186,

The infrared excess of G29-38: A brown dwarf or dust?

The white dwarf star G29-38 has an infrared excess which may be due to a cool low-mass companion, probably a brown dwarf, or to circumstellar dust. If the excess is due to dust, then changes in

The Massive Disk around OH 231.8+4.2

We have obtained 11.7 and 17.9 μm images at the Keck I telescope of the circumstellar dust emission from OH 231.8+4.2, an evolved mass-losing red giant with a well-studied bipolar outflow. We detect