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Spitzer Space Telescope IRAC 3-8 micron and AKARI IRC 2-4 micron photometryare reported for ten white dwarfs with photospheric heavy elements; ninerelatively cool stars with photospheric calcium, and one hotter star with apeculiar high carbon abundance. A substantial infrared excess is detected at HE2221-1630, while modest excess emissions are identified at HE 0106-3253 and HE0307+0746, implying these latter two stars have relatively narrow (Delta r <0.1 Rsol) rings of circumstellar dust. A likely 7.9 micron excess is found atPG 1225-079 and may represent, together with G166-58, a sub-class of dust ringwith a large inner hole. The existence of attenuated disks at white dwarfssubstantiates the connection between their photospheric heavy elements and theaccretion of disrupted minor planets, indicating many polluted white dwarfs mayharbor orbiting dust, even those lacking an obvious infrared excess.

Strengthening the Case for Asteroidal Accrection: Evidence for Subtle and Diverse Disks at White Dwarfs