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A set of six debris disk candidates identified with IRAS or WISE excesseswere observed at either 350 um or 450 um with the CSO. Five of the targets -HIP 51658, HIP 68160, HIP 73512, HIP 76375, and HIP 112460 - have among thelargest measured excess emission from cold dust from IRAS in the 25-100 umbands. Single temperature blackbody fits to the excess dust emission of thesesources predict 350-450 um fluxes above 240 mJy. The final target - HIP 73165 -exhibits weak excess emission above the stellar photosphere from WISEmeasurements at 22 um, indicative of a population of warm circumstellar dust.None of the six targets were detected, with 3 sigma upper limits ranging from51-239 mJy. These limits are significantly below the expected fluxes from SEDfitting. Two potential causes of the null detections were explored - companionstars and contamination. To investigate the possible influence of companionstars, imaging data were analyzed from new AO data from the MMT and archivalHST, NIRI, and POSS/2MASS data. The images are sensitive to all stellarcompanions beyond a radius of 1-94 AU. One target is identified as a binarysystem, but with a separation too large to impact the disk. While thegravitational effects of a companion do not appear to provide an explanationfor the submm upper limits, the majority of the IRAS excess targets showevidence for contaminating sources, based on investigation of higher resolutionWISE and archival Spitzer and Herschel images. Finally, the exploratory submmmeasurements of the WISE excess source suggest that the hot dust present aroundthese targets is not matched by a comparable population of colder, outer dust.More extensive and more sensitive Herschel observations of WISE excess sourceswill build upon this initial example to further define the characteristics ofwarm debris disks sources.

Sub-millimeter observations of IRAS and WISE debris disk candidates