The Enigmatic Brown Dwarf WISE 1828+2650

The Y-dwarf WISE 1828+2650 is one of the coldest known Brown Dwarfs with an effective temperature of ∼300 K. Located at a distance of just 10 pc, previous model-based estimates suggest WISE1828+2650 has a mass of ∼5-10 MJ, making it a valuable laboratory for understanding the formation, evolution and physical characteristics of gas giant planets. However, previous photometry and spectroscopy have presented a puzzle with the near-impossibility of simultaneously fitting both the short (0.9-2.0 um) and long wavelength (3-5 um) data. A potential solution to this problem has been the suggestion thatWISE 1828+2650 is a binary system whose composite spectrum might provide a better match to the data. This article describes JWST/NIRCam observations of WISE 1828+2650 in 6 filters to address the binarity question and to provide new photometry to be used in model fitting. We find no evidence for binarity.