JWST Observations of the Enigmatic Y-Dwarf WISE 1828+2650. I. Limits to a Binary Companion

May 2023 • 2023ApJ...948...92D

Authors • De Furio, Matthew • Lew, Ben • Beichman, Charles • Roellig, Thomas • Bryden, Geoffrey • Ciardi, David • Meyer, Michael • Rieke, Marcia • Greenbaum, Alexandra • Leisenring, Jarron • Llop-Sayson, Jorge • Ygouf, Marie • Albert, Loic • Boyer, Martha • Eisenstein, Daniel • Hodapp, Klaus • Horner, Scott • Johnstone, Doug • Kelly, Doug • Misselt, Karl • Rieke, George • Stansberry, John • Young, Erick

Abstract • 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 M _J, 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 μm) and long-wavelength (3-5 μm) data. A potential solution to this problem has been the suggestion that WISE 1828+2650 is a binary system whose composite spectrum might provide a better match to the data. Alternatively, new models being developed to fit JWST/NIRSpec, and MIRI spectroscopy might provide new insights. This article describes JWST/NIRCam observations of WISE 1828+2650 in six filters to address the binarity question and to provide new photometry to be used in model fitting. We also report adaptive optics imaging with the Keck I0 m telescope. We find no evidence for multiplicity for a companion beyond 0.5 au with either JWST or Keck. Companion articles will present low- and high-resolution spectra of WISE 1828 obtained with both NIRSpec and MIRI.

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IPAC Authors
(alphabetical)

David Ciardi

Senior Scientist

Alexandra Greenbaum

Assistant Scientist