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Published August 10, 2019 | Accepted Version + Published
Journal Article Open

CWISEP J193518.59–154620.3: An Extremely Cold Brown Dwarf in the Solar Neighborhood Discovered with CatWISE


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).

Additional Information

© 2019 The American Astronomical Society. Received 2019 April 22; revised 2019 June 20; accepted 2019 June 20; published 2019 August 7. This research was partly carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. F.M. is supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, administered by Universities Space Research Association under contract with NASA. A.M.M. acknowledges support from Hubble Fellowship HST-HF2-51415.001-A. CatWISE is funded by NASA under Proposal No. 16-ADAP16-0077 issued through the Astrophysics Data Analysis Program, and uses data from the NASA-funded WISE and NEOWISE projects. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.

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Published - Marocco_2019_ApJ_881_17.pdf

Accepted Version - 1906.08913.pdf


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August 19, 2023
October 18, 2023