Results 11 to 20 of about 2,436 (245)

Dynamics of Y dwarf atmospheres

Astronomy & Astrophysics
Context. The global circulation regime of the coolest class of brown dwarfs, known as the Y dwarfs, remains largely unexplored. Aims. We aim to investigate the interplay between convection, rotation, and cloud thermal feedback through a selected sample ...
Akın C., Lee E. K. H., Gkouvelis L., Heng K.   +3 more
doaj   +3 more sources

Discovery of the Second Y+Y Dwarf Binary System: CWISEP J193518.59-154620.3

The Astrophysical Journal Letters
We present the discovery of a companion to the Y dwarf, CWISEP J193518.59–154620.3, the second Y-Y dwarf binary detected to date. Y dwarfs are the coldest known free-floating objects (
Matthew De Furio, Jacqueline Kelly Faherty, Daniella C. Bardalez Gagliuffi, Jonathan Gagné, Eileen C. Gonzales, Rocio Kiman, Marc Kuchner, Federico Marocco, Sherelyn Alejandro Merchan, Melanie Rowland, Adam C. Schneider, Genaro Suárez, Johanna M. Vos   +12 more
doaj   +3 more sources

PARALLAXES AND PROPER MOTIONS OF ULTRACOOL BROWN DWARFS OF SPECTRAL TYPES Y AND LATE T [PDF]

The Astrophysical Journal, 2012
We present astrometric measurements of eleven nearby ultracool brown dwarfs of spectral types Y and late-T, based on imaging observations from a variety of space-based and ground-based telescopes. These measurements have been used to estimate relative parallaxes and proper motions via maximum likelihood fitting of geometric model curves.
Marsh, Kenneth A., Wright, Edward L., Kirkpatrick, J. Davy, Gelino, Christopher R., Cushing, Michael C., Griffith, Roger L., Skrutskie, Michael F., Eisenhardt, Peter R.   +7 more
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RESOLVED SPECTROSCOPY OF A BROWN DWARF BINARY AT THE T DWARF/Y DWARF TRANSITION [PDF]

The Astrophysical Journal, 2011
We report resolved near-infrared imaging and spectroscopic observations of the T8.5 binary WISEP J045853.90+643452.6AB obtained with Keck/NIRC2, Keck/OSIRIS and the Keck Laser Guide Star Adaptive Optics system. These data confirm common proper and radial motion for the two components, and we see the first indications of orbital motion (mostly radial ...
Burgasser, Adam J., Gelino, Christopher R., Cushing, Michael C., Kirkpatrick, J. Davy   +3 more
openaire   +3 more sources

Astrometry and Photometry for ≈1000 L, T, and Y Dwarfs from the UKIRT Hemisphere Survey

The Astronomical Journal, 2023
We present the positions, proper motions, and near-infrared photometry for 966 known objects with spectral types later than M that were observed as part of the the UKIRT Hemisphere Survey (UHS).
Adam C. Schneider, Jeffrey A. Munn, Frederick J. Vrba, Justice Bruursema, Scott E. Dahm, Stephen J. Williams, Michael C. Liu, Bryan N. Dorland   +7 more
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JWST/NIRSpec Observations of the Coldest Known Brown Dwarf

The Astronomical Journal, 2023
We present 1–5 μ m spectroscopy of the coldest known brown dwarf, WISE J085510.83−071442.5 (WISE 0855), performed with the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST).
K. L. Luhman, P. Tremblin, C. Alves de Oliveira, S. M. Birkmann, I. Baraffe, G. Chabrier, E. Manjavacas, R. J. Parker, J. Valenti   +8 more
doaj   +1 more source

WISEY DWARFS AS PROBES OF THE BROWN DWARF-EXOPLANET CONNECTION [PDF]

The Astrophysical Journal, 2014
We have determined astrometric positions for 15 WISE-discovered late-type brown dwarfs (6 T8-9 and 9 Y dwarfs) using the Keck II telescope, the Spitzer Space Telescope, and the Hubble Space Telescope. Combining data from 8 to 20 epochs we derive parallactic and proper motions for these objects which put the majority within 15 parsecs.
Beichman, C., Gelino, Christopher R., Kirkpatrick, J. Davy, Cushing, Michael C., Dodson-Robinson, Sally, Marley, Mark S., Morley, Caroline V., Wright, E. L.   +7 more
openaire   +2 more sources

Discovery of a new Y dwarf: WISE J030449.03−270508.3 [PDF]

Monthly Notices of the Royal Astronomical Society, 2014
10 pages, 6 figures, accepted for publication in ...
Pinfield, D. J., Gromadzki, M., Leggett, S. K., Gomes, J., Lodieu, N., Kurtev, R., Day-Jones, A. C., Ruiz, M. T., Cook, N. J., Morley, C. V., Marley, M. S., Marocco, F., Smart, R. L., Jones, H. R. A., Lucas, P. W., Beletsky, Y., Ivanov, V. D., Burningham, B., Jenkins, J. S., Cardoso, C., Frith, J., Clarke, J. R. A., Galvez-Ortiz, M. C., Zhang, Z.   +23 more
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A Uniform Retrieval Analysis of Ultra-cool Dwarfs. III. Properties of Y Dwarfs [PDF]

The Astrophysical Journal, 2019
Abstract Ultra-cool brown dwarfs offer a unique window into understanding substellar atmospheric physics and chemistry. Their strong molecular absorption bands at infrared wavelengths, Jupiter-like radii, cool temperatures, and lack of complicating stellar irradiation make them ideal test beds for understanding Jovian-like atmospheres ...
Joseph A. Zalesky, Michael R. Line, Adam C. Schneider, Jennifer Patience   +3 more
openaire   +2 more sources

NEGLECTED CLOUDS IN T AND Y DWARF ATMOSPHERES [PDF]

The Astrophysical Journal, 2012
17 pages, 12 figures, Accepted for publication in ...
Morley, Caroline V., Fortney, Jonathan J., Marley, Mark S., Visscher, Channon, Saumon, Didier, Leggett, S. K.   +5 more
openaire   +2 more sources