Uniform Forward-Modeling Analysis of Ultracool Dwarfs. II. Atmospheric Properties of 55 Late-T Dwarfs
Zhoujian Zhang,
Michael C. Liu,
Mark S. Marley
et al.
Abstract:We present a large uniform forward-modeling analysis for 55 late-T (T7−T9) dwarfs, using low-resolution (R ≈ 50−250) nearinfrared (1.0 − 2.5 µm) spectra and cloudless Sonora-Bobcat model atmospheres. We derive the objects' effective temperatures, surface gravities, metallicities, radii, masses, and bolometric luminosities using our newly developed Bayesian framework, and use the resulting population properties to test the model atmospheres. We find (1) our objects' fitted metallicities are 0.3 − 0.4 dex lower … Show more
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