Results 21 to 30 of about 69,461 (285)
A Uniform Retrieval Analysis of Ultracool 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
+8 more sources
CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition? [PDF]
Astronomy & Astrophysics, 2008 We report the discovery of CFBDS J005910.90-011401.3 (hereafter CFBDS0059), the coolest brown dwarf identified to date. We found CFBDS0059 using i' and z' images from the Canada-France-Hawaii Telescope (CFHT), and present optical and near-infrared photometry, Keck laser guide star adaptive optics imaging, and a complete near-infrared spectrum, from 1.0
P. Delorme +11 more
+11 more sources
Parallaxes and Proper Motions of Ultracool Brown Dwarfs of Spectral Types Y and Late T [PDF]
The Astrophysical Journal, 2013 We present astrometric measurements of 11 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.
Cushing, Michael C. +7 more
core +7 more sources
Optical properties of Y dwarfs observed with the Gran Telescopio Canarias [PDF]
Astronomy & AstrophysicsAims. Our science goals are to characterise the optical properties of Y dwarfs and to study their consistency with theoretical models. Methods. A sample of five Y dwarfs was observed with three optical and near-infrared instruments at the 10.4m Gran Telescopio Canarias. Deep near-infrared (J- or H-band) and multicolour optical images (ɀ-, i-, r-, 𝑔-, u-
E. L. Martı́n +5 more
+5 more sources
NEGLECTED CLOUDS IN T AND Y DWARF ATMOSPHERES [PDF]
The Astrophysical Journal, 2012 17 pages, 12 figures, Accepted for publication in ...
Caroline Morley +5 more
openalex +5 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.
Charles Beichman +7 more
openalex +5 more sources
ΔY/ΔZfrom the analysis of local K dwarfs [PDF]
Astronomy and Astrophysics, 2010 Accepted for publication in Astronomy & ...
Mario Gennaro +2 more
openalex +3 more sources
An Improved Near-infrared Spectrum of the Archetype Y Dwarf WISEP J182831.08+265037.8 [PDF]
The Astrophysical Journal, 2021 Abstract We present a Hubble Space Telescope/Wide-Field Camera 3 near-infrared spectrum of the archetype Y dwarf WISEP 182831.08+265037.8. The spectrum covers the 0.9–1.7 μm wavelength range at a resolving power of λ/Δλ ≈ 180 and is a significant improvement over the previously published spectrum because it covers a broader wavelength ...
Michael C. Cushing +10 more
openalex +7 more sources
Y Dwarfs: The Challenge of Discovering the Coldest Substellar Population in the Solar Neighborhood [PDF]
, 2018 To be published in: Handbook of Exoplanets, 2nd Edition, Hans Deeg and Juan Antonio Belmonte (Eds.
S. K. Leggett
openalex +4 more sources
WISE J163940.83–684738.6: A Y DWARF IDENTIFIED BY METHANE IMAGING [PDF]
The Astrophysical Journal, 2012 We have used methane imaging techniques to identify the near-infrared counterpart of the bright WISE source WISEJ163940.83-684738.6. The large proper motion of this source (around 3.0arcsec/yr) has moved it, since its original WISE identification, very close to a much brighter background star -- it currently lies within 1.5" of the J=14.90+-0.04 star ...
C. G. Tinney +7 more
openalex +7 more sources