Externally-polluted white dwarfs with dust disks

Abstract

We report Spitzer Space Telescope photometry of eleven externally-polluted white dwarfs. Of the nine stars for which we have IRAC photometry, we find that GD 40, GD 133 and PG 1015+161 each has an infrared excess that can be understood as arising from a flat, opaque, dusty disk. GD 56 also has an infrared excess characteristic of circumstellar dust, but a flat-disk model cannot reproduce the data unless there are grains as warm as 1700 K and perhaps not even then. Our data support the previous suggestion that the metals in the atmosphere of GD 40 are the result of accretion of a tidally-disrupted asteroid with a chondritic composition.

ApJ, in press

References in corpus (24)

• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The Spitzer Space Telescope Mission
• New Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints
• A Tidally-Disrupted Asteroid Around the White Dwarf G29-38
• Absolute Calibration of the Infrared Array Camera on the Spitzer Space Telescope
• Are There Unstable Planetary Systems Around White Dwarfs?
• A gaseous metal disk around a white dwarf
• Low Luminosity Companions to White Dwarfs
• The Dust cloud around the White Dwarf G 29-38
• A Dusty Disk Around GD 362, a White Dwarf With a Uniquely High Photospheric Metal Abundance
• Debris Disks Around White Dwarfs: The DAZ Connection
• Carbon Deficiency in Externally-Polluted White Dwarfs: Evidence for Accretion of Asteroids
• The New Class of Dusty DAZ White Dwarfs
• The accretion-diffusion scenario for metals in cool white dwarfs
• Excess Infrared Radiation from a Massive DAZ White Dwarf: GD362 - a Debris Disk?
• Formation and Evolution of Planetary Systems (FEPS): Primordial Warm Dust Evolution From 3-30 Myr around Sun-like Stars
• Infrared Emission from the Dusty Disk Orbiting GD 362, An Externally-Polluted White Dwarf
• A Spitzer White Dwarf Infrared Survey
• A Dusty Disk Around WD1150-153: Explaining the Metals in White Dwarfs by Accretion from the Interstellar Medium versus Debris Disks
• Element abundances in cool white dwarfs. II. Ultraviolet observations of DZ white dwarfs
• Discovery of a Cool, Massive, and Metal-Rich DAZ White Dwarf
• The Formation and Evolution of Planetary Systems (FEPS): Discovery of an Unusual Debris System Associated with HD 12039
• The Mystery Deepens: Spitzer Observations of Cool White Dwarfs
• Do weak magnetic fields prevent hydrogen from accreting onto metal-line white dwarf stars?

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