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A Spitzer Space Telescope Exploration Science Program to Search for Y Dwarf Variability
Michael C. Cushing, Jesica L. Trucks, Kevin K. Hardegree-Ullman +10
We present the results of a Spitzer Space Telescope Exploration Science Program to search for and characterize variability in Y dwarfs. We observed 14 Y dwarfs over a 24 hr period…
The SPHINX M dwarf Spectral Grid. II. New Model Atmospheres and Spectra to Derive Fundamental Properties of mid-to-late type M-dwarfs
Aishwarya R. Iyer, Michael R. Line, Philip S. Muirhead +2
M-dwarfs are the most dominant stars in the Galaxy. Their interiors and atmospheres exhibit complex processes including dust condensation, convective feedback, and magnetic activit…
The Sonora Substellar Atmosphere Models VI. Red Diamondback: Extending Diamondback with SPHINX for Brown Dwarf Early Evolution
C. Evan Davis, Jonathan J. Fortney, Aishwarya Iyer +5
We extend the Sonora Diamondback brown dwarf evolution models to higher effective temperatures to treat the evolution of younger, higher mass objects. Due to an upper temperature l…
A 1.48-2.48 m R=28000 spectroscopic atlas of the L7.5 and T0.5 components of the nearest pair of brown dwarfs: Luhman 16AB
Hiroyuki Tako Ishikawa, Stanimir Metchev, Megan E. Tannock +6
We present a high signal-to-noise (SNR 450), high-dispersion () H- and K-band spectroscopic atlas of the L7.5 and T0.5 components of the Luhman 1…
Protosolar D-to-H abundance and one part-per-billion PH in the coldest brown dwarf
Melanie J. Rowland, Caroline V. Morley, Brittany E. Miles +24
The coldest Y spectral type brown dwarfs are similar in mass and temperature to cool and warm (200 -- 400 K) giant exoplanets. We can therefore use their atmospheres as proxi…
High-Precision Atmospheric Constraints for a Cool T Dwarf from JWST Spectroscopy
Callie E. Hood, Sagnick Mukherjee, Jonathan J. Fortney +12
We present observations of the T8 dwarf 2MASS 0415-0935 with JWST's NIRSpec spectrograph using the G395H grating ( 2.87 - 5.14 m). We perform the first atmospheric retriev…
The Sonora Substellar Atmosphere Models. III. Diamondback: Atmospheric Properties, Spectra, and Evolution for Warm Cloudy Substellar Objects
Caroline V. Morley, Sagnick Mukherjee, Mark S. Marley +7
We present a new grid of cloudy atmosphere and evolution models for substellar objects. These models include the effect of refractory cloud species, including silicate clouds, on t…
Seventy six T dwarfs from the UKIDSS LAS: benchmarks, kinematics and an updated space density
Ben Burningham, C. V. Cardoso, L. Smith +34
We report the discovery of 76 new T dwarfs from the UKIDSS Large Area Survey (LAS). Near-infrared broad and narrow-band photometry and spectroscopy are presented for the new object…