Discovery of Seven Cold and Distant Brown Dwarfs with JWST RUBIES
Sara J. Morrissey (UCSD, Notre Dame), Adam J. Burgasser (UCSD), Anna de Graaff (MPIA, Harvard SAO), Ian McConachie (U. Wisconsin-Madison), and Gabriel Brammer (Cosmic Dawn Center, University of Copenhagen)

TL;DR
This study uses JWST NIRSpec data to classify seven distant brown dwarfs, analyze their atmospheric properties, and explore their Galactic population membership, providing insights for future infrared surveys.
Contribution
First near-infrared spectral analysis of seven distant brown dwarfs with JWST, revealing their spectral types, atmospheric parameters, and Galactic population memberships.
Findings
Spectral types range from L1 to T8.
Three objects likely belong to the thick disk or halo.
Spectral variations influenced by temperature, gravity, and metallicity.
Abstract
We report near-infrared spectral model fits to seven distant L- and T-type dwarfs observed with the JWST Near Infrared Spectrograph (NIRSpec) as part of the Red Unknowns: Bright Infrared Extragalactic Survey (RUBIES). Comparison of 0.9-2.5 m near-infrared spectra of these sources to spectral standards indicates spectral types spanning L1 to T8 and spectrophotometric distances spanning 800-3,000 pc. Fits to three grids of spectral models yield atmosphere parameters and spectrophotometric distances largely consistent with our classifications, although fits to L dwarf spectra indicate missing components to the models. Three of our sources have vertical displacements from the Galactic plane exceeding 1~kpc, and have high probabilities of membership in the Galactic thick disk population. Of these, the L dwarf RUBIES-BD-3 (RUBIES-EGS-3081) is well-matched to subdwarf standards, while the…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Astronomy and Astrophysical Research
