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We report the discovery of excess K-band radiation from a massive DAZ whitedwarf star, GD362. Combining infrared photometric and spectroscopicobservations, we show that the excess radiation cannot be explained by astellar 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 afterG29-38, the only single white dwarf currently known to be orbited bycircumstellar dust. Both of these systems favor a model with accretion from asurrounding debris disk to explain the metal abundances observed in DAZ whitedwarfs. Nevertheless, observations of more DAZs in the mid-infrared arerequired to test if this model can explain all DAZs.Comment: Accepted for publication in ApJ Letter

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