The WIRED Survey. IV. New Dust Disks from the McCook & Sion White Dwarf Catalog

Abstract

We have compiled photometric data from the Wide-field Infrared Survey Explorer All Sky Survey and other archival sources for the more than 2200 objects in the original McCook & Sion Catalog of Spectroscopically Identified White Dwarfs. We applied color-selection criteria to identify 28 targets whose infrared spectral energy distributions depart from the expectation for the white dwarf photosphere alone. Seven of these are previously known white dwarfs with circumstellar dust disks, five are known central stars of planetary nebulae, and six were excluded for being known binaries or having possible contamination of their infrared photometry. We fit white dwarf models to the spectral energy distributions of the remaining ten targets, and find seven new candidates with infrared excess suggesting the presence of a circumstellar dust disk. We compare the model dust disk properties for these new candidates with a comprehensive compilation of previously published parameters for known white dwarfs with dust disks. It is possible that the current census of white dwarfs with dust disks that produce an excess detectable at K-band and shorter wavelengths is close to complete for the entire sample of known WDs to the detection limits of existing near-IR all-sky surveys. The white dwarf dust disk candidates now being found using longer wavelength infrared data are drawn from a previously underrepresented region of parameter space, in which the dust disks are overall cooler, narrower in radial extent, and/or contain fewer emitting grains.

accepted for publication in The Astrophysical Journal; 34 pages, 5 figures, 5 tables; added missing reference in Section 2 (p. 7)

References in corpus (9)

• A gaseous metal disk around a white dwarf
• The Chemical Composition of an Extrasolar Minor Planet
• Pollution of single white dwarfs by accretion of many small asteroids
• Externally-polluted white dwarfs with dust disks
• Debris Disks Around White Dwarfs: The DAZ Connection
• Six White Dwarfs with Circumstellar Silicates
• Infrared Emission from the Dusty Disk Orbiting GD 362, An Externally-Polluted White Dwarf
• A Spitzer White Dwarf Infrared Survey
• Cool Companions to White Dwarf Stars from the Two Micron All Sky Survey All Sky Data Release

Cited by in corpus (27)

• Circumstellar Debris and Pollution at White Dwarf Stars
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• Signs of a faint disc population at polluted white dwarfs
• Numerical Simulations of Collisional Cascades at the Roche Limits of White Dwarf Stars
• The Drop during Less than 300 days of a Dusty White Dwarf's Infrared Luminosity
• Kepler and the seven dwarfs: detection of low-level day-timescale periodic photometric variations in white dwarfs
• Infrared observations of white dwarfs and the implications for the accretion of dusty planetary material
• Catalogue of central stars of planetary nebulae: Expanded edition
• Numerical Simulations of Gaseous Disks Generated from Collisional Cascades at the Roche Limits of White Dwarf Stars
• Infrared Excesses around Bright White Dwarfs from Gaia and unWISE I
• The dust never settles: collisional production of gas and dust in evolved planetary systems
• Another one grinds the dust: Variability of the planetary debris disc at the white dwarf SDSS J104341.53+085558.2
• A 3 Gyr White Dwarf with Warm Dust Discovered via the Backyard Worlds: Planet 9 Citizen Science Project
• Dusty WDs in the $WISE$ All Sky Survey $\cap$ SDSS
• A Word to the WISE: Confusion is Unavoidable for WISE-selected Infrared Excesses
• Radio Weak BL Lac objects in the Fermi era
• The sdA problem I: Physical Properties
• SDSS J074511.56+194926.5: Discovery of a Metal-Rich and Tidally Distorted Extremely Low Mass White Dwarf
• WIRED for EC: New White Dwarfs with $\text{WISE}$ Infrared Excesses and New Classification Schemes from the Edinburgh-Cape Blue Object Survey
• A Search for short-period Rocky Planets around WDs with the Cosmic Origins Spectrograph (COS)
• The Nucleus of the Planetary Nebula EGB 6 as a Post-Mira Binary
• A subtle IR excess associated with a young White Dwarf in the Edinburgh-Cape Blue Object Survey
• White Dwarfs with Infrared Excess from LAMOST Data Release 5
• White Dwarf Variability with gPhoton: Pulsators
• Gaia white dwarfs with infrared excess I. The 100 pc catalogue