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Evidence is building that remnants of solar systems might orbit a largepercentage of white dwarfs, as the polluted atmospheres of DAZ and DBZ whitedwarfs indicate the very recent accretion of metal-rich material. (Zuckerman etal. 2010). Some of these polluted white dwarfs are found to have largemid-infrared excesses from close-in debris disks that are thought to bereservoirs for the metal accretion. These systems are coined DAZd white dwarfs(von Hippel et al. 2007). Here we investigate the claims of Bonnet-Bidaud &Pantin (2008) that Sirius B, the nearest white dwarf to the Sun, might have aninfrared excess from a dusty debris disk. Sirius B's companion, Sirius A iscommonly observed as a mid-infrared photometric standard in the Southernhemisphere. We combine several years of Gemini/T-ReCS photometric standardobservations to produce deep mid-infrared imaging in five ~10 micron filters(broad N + 4 narrowband), which reveal the presence of Sirius B. Our photometryis consistent with the expected photospheric emission such that we constrainany mid-infrared excess to <10% of the photosphere. Thus we conclude thatSirius B does not have a large dusty disk, as seen in DAZd white dwarfs.

Sirius B Imaged in the Mid-Infrared: No Evidence for a Remnant Planetary System