Results 21 to 30 of about 71,830 (288)
DEEPz-BAND OBSERVATIONS OF THE COOLEST Y DWARF [PDF]
The Astrophysical Journal, 2014 WISE J085510.83-071442.5 (hereafter, WISE 0855-07) is the coolest Y dwarf known to date and is located at a distance of 2.31$\pm 0.08$ pc, giving it the fourth largest parallax of any known star or brown dwarf system. We report deep $z$-band observations of WISE 0855-07 using FORS2 on UT1/VLT. We do not detect any counterpart to WISE 0855-07 in our $z$-
Taisiya G. Kopytova +9 more
openalex +3 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.
C. Beichman +7 more
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Constraints on magnetospheric radio emission from Y dwarfs [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 Abstract As a pilot study of magnetism in Y dwarfs, we have observed the three known infrared variable Y dwarfs WISE J085510.83−071442.5, WISE J140518.40+553421.4, and WISEP J173835.53+273258.9 with the NSF’s Karl G. Jansky Very Large Array in the 4–8 GHz frequency range.
Melodie M. Kao +2 more
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CWISE J105512.11+544328.3: A Nearby Y Dwarf Spectroscopically Confirmed with Keck/NIRES [PDF]
The Astrophysical Journal, 2023 Y dwarfs, the coolest known spectral class of brown dwarfs, overlap in mass and temperature with giant exoplanets, providing unique laboratories for studying low-temperature atmospheres. However, only a fraction of Y dwarf candidates have been spectroscopically confirmed.
G. Robbins +15 more
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THE COLDEST BROWN DWARF (OR FREE-FLOATING PLANET)?: THE Y DWARF WISE 1828+2650 [PDF]
The Astrophysical Journal, 2013 We have monitored the position of the cool Y dwarf WISEPA J182831.08+265037.8 using a combination of ground- and space-based telescopes and have determined its distance to be 11.2$_{-1.0}^{+1.3}$ pc. Its absolute H magnitude, M$_H=22.21^{+0.25}_{-0.22}$ mag, suggests a mass in the range 0.5-20 M$_{Jup}$ for ages of 0.1-10 Gyr with an effective ...
C. A. Beichman +6 more
openalex +4 more sources
Outstanding Issues in Our Understanding of L, T, and Y Dwarfs [PDF]
, 2007 11 pages including 5 figures.
J. Davy Kirkpatrick
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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. +3 more
openaire +3 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
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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 +8 more
doaj +1 more source
GIANOY-band spectroscopy of dwarf stars: Phosphorus, sulphur, and strontium abundances [PDF]
Astronomy & Astrophysics, 2015 In recent years a number of poorly studied chemical elements, such as phosphorus, sulphur, and strontium, have received special attention as important tracers of the Galactic chemical evolution. By exploiting the capabilities of the infrared echelle spectrograph GIANO mounted at the Telescopio Nazionale Galileo, we acquired high resolution spectra of ...
E. Caffau +7 more
openalex +5 more sources