Using observations of Spitzer/IRAC , we report the serendipitous discovery of excess infrared emission from a single white dwarf PG 0010+280 .
At a temperature of 27,220 K and a cooling age of 16 Myr , it is the hottest and youngest white dwarf to display an excess at 3-8 \mu m. The infrared excess can be fit by either an opaque dust disk within the tidal radius of the white dwarf or a 1300 K blackbody , possibly from an irradiated substellar object or a re-heated giant planet .
PG 0010+280 has two unique properties that are different from white dwarfs with a dust disk : ( i ) relatively low emission at 8 \mu m and ( ii ) non-detection of heavy elements in its atmosphere from high-resolution spectroscopic observations with Keck/HIRES .
The origin of the infrared excess remains unclear .