Results 21 to 30 of about 22,040,331 (192)
A Spitzer Space Telescope Exploration Science Program to Search for Y-dwarf Variability
The Astronomical JournalWe 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 at [3.6] and [4.5] and then repeated the observations a few months later ...
Michael C. Cushing +12 more
doaj +3 more sources
Exploration of the Near-infrared Colors of Cold Y Dwarfs from the Ground and Space
The Astrophysical JournalThe James Webb Space Telescope (JWST) has provided critical mid-infrared data for cold brown dwarfs. It has also provided low-resolution near-infrared spectra, and for faint sources these are the first spectra at these wavelengths.
S. K. Leggett +2 more
doaj +3 more sources
Discovery of the Second Y+Y Dwarf Binary System: CWISEP J193518.59-154620.3
The Astrophysical Journal LettersWe 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 +12 more
doaj +3 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. +23 more
+8 more sources
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. +3 more
openaire +3 more sources
WATER CLOUDS IN Y DWARFS AND EXOPLANETS [PDF]
The Astrophysical Journal, 2014 23 pages, 20 figures, Revised for ...
Morley, Caroline V +6 more
openaire +4 more sources
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. +7 more
openaire +2 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 +7 more
doaj +1 more source
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 +3 more
openaire +2 more sources
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 +8 more
doaj +1 more source