CWISEP J193518.59-154620.3: An Extremely Cold Brown Dwarf in the Solar Neighborhood Discovered with CatWISE
Teplitz, Harry I.; Schlegel, David J.; Mobasher, Bahram; Meisner, Aaron M.; Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Wright, Edward L.; Eisenhardt, Peter R. M.; Stern, Daniel; Marocco, Federico; Faherty, Jacqueline K.; Caselden, Dan; Fowler, John W.; Jarrett, Thomas H.; Cutri, Roc M.; Garcia, Nelson; Koontz, Renata; Mainzer, Amanda; Marchese, Elijah J.
United States, South Africa
Abstract
We present the discovery of an extremely cold, nearby brown dwarf in the solar neighborhood, found in the CatWISE catalog. Photometric follow-up with Spitzer reveals that the object, CWISEP J193518.59-154620.3, has ch1-ch2 = 3.24 ± 0.31 mag, making it one of the reddest brown dwarfs known. Using the Spitzer photometry and the polynomial relations from Kirkpatrick et al. we estimate an effective temperature in the ∼270-360 K range, and a distance estimate in the 5.6-10.9 pc range. We combined the WISE, NEOWISE, and Spitzer data to measure a proper motion of {μ }α \cos δ =337+/- 69 mas yr-1, μ δ = -50 ± 97 mas yr-1, which implies a relatively low tangential velocity in the range 7-22 km s-1.