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We report the discovery of the first new ultra-cool brown dwarf found withthe Wide-field Infrared Survey Explorer (WISE). The object's preliminarydesignation is WISEPC J045853.90+643451.9. Follow-up spectroscopy with theLUCIFER instrument on the Large Binocular Telescope indicates that it is a verylate-type T dwarf with a spectral type approximately equal to T9. Fits to anIRTF/SpeX 0.8-2.5 micron spectrum to the model atmospheres of Marley and Saumonindicate an effective temperature of approximately 600 K as well as thepresence of vertical mixing in its atmosphere. The new brown dwarf is easilydetected by WISE, with a signal-to-noise ratio of ~36 at 4.6 microns. Currentestimates place it at a distance of 6 to 10 pc. This object represents thefirst in what will likely be hundreds of nearby brown dwarfs found by WISE thatwill be suitable for follow up observations, including those with the JamesWebb Space Telescope. One of the two primary scientific goals of the WISEmission is to find the coolest, closest stars to our Sun; the discovery of thisnew brown dwarf proves that WISE is capable of fulfilling this objective.

The First Ultra-Cool Brown Dwarf Discovered by the Wide-field Infrared Survey Explorer