Results 81 to 90 of about 22,040,331 (192)

Clouds and chemistry across the brown dwarf T-Y sequence: Insights from JWST atmospheric retrievals

Astronomy & Astrophysics
The James Webb Space Telescope offers exceptional spectral resolution and wavelength coverage, which are essential for studying the coldest brown dwarfs, particularly Y dwarfs.
Lueber A., Kitzmann D., Heng K.
doaj   +1 more source

The Y Dwarf Companion to the White Dwarf WD 0806-66: Resolving the Discrepancy between Atmospheric and Evolutionary Models

The Astrophysical Journal
Abstract James Webb Space Telescope near- and mid-infrared spectroscopy has been published by M. Voyer et al. and B. W. P. Lew et al. for the Y dwarf, which is a distant companion to the white dwarf WD 0806-661.
S. K. Leggett, Pascal Tremblin
openaire   +2 more sources

Diversity of Cold Worlds: Predicted Near-to-mid-infrared Spectral Signatures of a Cold Brown Dwarf with Potential Auroral Heating

The Astrophysical Journal
Recent James Webb Space Telescope NIRSpec observations have revealed strong methane emission at 3.326 μ m in the ≈482 K brown dwarf CWISEP J193518.59−154620.3 (W1935).
Genaro Suárez, Jacqueline K. Faherty, Ben Burningham, Caroline V. Morley, Johanna M. Vos, Brianna Lacy, Melanie J. Rowland, Adam C. Schneider, Sherelyn Alejandro Merchan, Daniella C. Bardalez Gagliuffi, Thomas P. Bickle, Eileen C. Gonzales, Rocio Kiman, Austin Rothermich, Niall Whiteford   +14 more
doaj   +1 more source

A Volume-limited Sample of Ultracool Dwarfs. II. The Substellar Age and Mass Functions in the Solar Neighborhood

The Astrophysical Journal
We present the most precise constraints to date for the mass and age distributions of single ultracool dwarfs in the solar neighborhood, based on an updated volume-limited sample of 504 L, T, and Y dwarfs within 25 pc.
William M. J. Best, Aniket Sanghi, Michael C. Liu, Eugene A. Magnier, Trent J. Dupuy   +4 more
doaj   +1 more source

Enigmas from the Sloan Digital Sky Survey DR7 White Dwarf Catalog

, 2021
We report results from a continuation of our searches for magnetic white dwarfs paired in a detached binary with a non-degenerate companion, using the Data Release 7 (DR7) of the Sloan Digital Sky Survey.
Liebert, James, Wickramasinghe, Dayal, Ferrario, Lilia, Smith, Paul S   +3 more
core  

The First Hundred Brown Dwarfs Discovered by the Wide-Field Infrared Survey Explorer (WISE) [PDF]

, 2011
We present ground-based spectroscopic verification of six Y dwarfs also Cushing et al.), eighty-nine T dwarfs, eight L dwarfs, and one M dwarf identified by the Wide-field Infrared Survey Explorer (WISE).
Gelino, Christopher R., Vacca, William D., Tsai, Chao-Wei, Stapelfeldt, Karl R., Wright, Edward L., Eisenhardt, Peter R., Stern, Daniel, Benford, Dominic J., Cushing, Michael C., Lake, Sean E., Skrutskie, Michael F., Petty, Sara M., Griffith, Roger L., Kirkpatrick, J. Davy, Bauer, James M., Mainzer, Amanda K., Marsh, Kenneth A., McLean, Ian S., Beichman, Charles   +18 more
core  

The Sonora Substellar Atmosphere Models. IV. Elf Owl: Atmospheric Mixing and Chemical Disequilibrium with Varying Metallicity and C/O Ratios

The Astrophysical Journal
Disequilibrium chemistry due to vertical mixing in the atmospheres of many brown dwarfs and giant exoplanets is well established. Atmosphere models for these objects typically parameterize mixing with the highly uncertain K _zz diffusion parameter.
Sagnick Mukherjee, Jonathan J. Fortney, Caroline V. Morley, Natasha E. Batalha, Mark S. Marley, Theodora Karalidi, Channon Visscher, Roxana Lupu, Richard Freedman, Ehsan Gharib-Nezhad   +9 more
doaj   +1 more source

El teatro intelectual en la novela de Harold Pinter "The Dwarfs". [PDF]

, 2019
This article studies the phenomenon of ‘intellectual drama’ as a complex of ideas that the authors attribute to Harold Pinter’s writings, namely his novel ‘The dwarfs’ (1952-1956, 1990). The novel, written in the 50s and revised in 1989, presents a witty,
Vera B. Shamina, Kseniya V. Arjantzeva, Elena M. Apenko.    +2 more
core  

Three Brown Dwarfs Masquerading as High-redshift Galaxies in JWST Observations

The Astrophysical Journal
We report the spectroscopic identification of three brown dwarf candidates—o005_s41280, o006_s00089, and o006_s35616—discovered in RUBIES using James Webb Space Telescope (JWST) Near-Infrared Spectrograph PRISM/CLEAR spectroscopy.
Zhijun Tu, Shu Wang, Xiaodian Chen, Jifeng Liu   +3 more
doaj   +1 more source

Redshifting the Study of Cold Brown Dwarfs and Exoplanets: The Mid-infrared Wavelength Region as an Indicator of Surface Gravity and Mass

The Astrophysical Journal
JWST is opening many avenues for exploration. For cold brown dwarfs and exoplanets, JWST has opened the door to the mid-infrared wavelength region, where such objects emit significant energy.
S. K. Leggett, Pascal Tremblin
doaj   +1 more source