Echoes of a decaying planetary system: the gaseous and dusty disks surrounding three white dwarfs

Abstract

We have performed a comprehensive ground-based observational program aimed at characterizing the circumstellar material orbiting three single white dwarf stars previously known to possess gaseous disks. Near-infrared imaging unambiguously detects excess infrared emission towards Ton 345 and allows us to refine models for the circumstellar dust around all three white dwarf stars. We find that each white dwarf hosts gaseous and dusty disks that are roughly spatially coincident, a result that is consistent with a scenario in which dusty and gaseous material has its origin in remnant parent bodies of the white dwarfs' planetary systems. We briefly describe a new model for the gas disk heating mechanism in which the gaseous material behaves like a "Z II" region. In this Z II region, gas primarily composed of metals is photoionized by ultraviolet light and cools through optically thick allowed Ca II-line emission.

43 pages, 9 tables, 9 figures. Accepted to ApJ

References in corpus (11)

• 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
• JHK Observations of Faint Standard Stars in the Mauna Kea Near-Infrared Photometric System
• Six White Dwarfs with Circumstellar Silicates
• SDSSJ104341.53+085558.2: A second white dwarf with a gaseous debris disc
• The Discovery of the Most Metal-Rich White Dwarf: Composition of a Tidally Disrupted Extrasolar Dwarf Planet
• Infrared Emission from the Dusty Disk Orbiting GD 362, An Externally-Polluted White Dwarf
• Spectral modeling of gaseous metal disks around DAZ white dwarfs

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