Excess Infrared Radiation from a Massive DAZ White Dwarf: GD362 - a Debris Disk?

We report the discovery of excess K-band radiation from a massive DAZ white dwarf star, GD362. Combining infrared photometric and spectroscopic observations, we show that the excess radiation cannot be explained by a stellar or substellar companion, and is likely to be caused by a debris disk. This...

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Published in:arXiv.org 2005-09
Main Authors: Kilic, Mukremin, Ted von Hippel, Leggett, S K, Winget, D E
Format: Article
Language:English
Subjects:
Cosmic dust
Debris
Deposition
Infrared photometry
Infrared radiation
Model testing
Photometry
White dwarf stars
White dwarfs
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Ted von Hippel
Leggett, S K
Winget, D E
description We report the discovery of excess K-band radiation from a massive DAZ white dwarf star, GD362. Combining infrared photometric and spectroscopic observations, we show that the excess radiation cannot be explained by a stellar or substellar companion, and is likely to be caused by a debris disk. This would be only the second such system known, discovered 18 years after G29-38, the only single white dwarf currently known to be orbited by circumstellar dust. Both of these systems favor a model with accretion from a surrounding debris disk to explain the metal abundances observed in DAZ white dwarfs. Nevertheless, observations of more DAZs in the mid-infrared are required to test if this model can explain all DAZs.
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subjects Cosmic dust
Debris
Deposition
Infrared photometry
Infrared radiation
Model testing
Photometry
White dwarf stars
White dwarfs
title Excess Infrared Radiation from a Massive DAZ White Dwarf: GD362 - a Debris Disk?
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