Self-consistent Models of Y Dwarf Atmospheres with Water Clouds and Disequilibrium Chemistry [PDF]
The Astrophysical Journal, 2023 Y dwarfs are the coolest spectral class of brown dwarf. They have effective temperatures less than 500 K, with the coolest detection as low as ∼250 K.
Brianna Lacy, Adam Burrows
doaj +4 more sources
The First Y Dwarf Data from JWST Show that Dynamic and Diabatic Processes Regulate Cold Brown Dwarf Atmospheres [PDF]
The Astrophysical Journal, 2023 The James Webb Space Telescope (JWST) is now observing Y dwarfs, the coldest known brown dwarfs, with effective temperatures T _eff ≲ 475 K. The first published observations provide important information: not only is the atmospheric chemistry out of ...
S. K. Leggett, Pascal Tremblin
doaj +6 more sources
The First JWST Spectral Energy Distribution of a Y Dwarf [PDF]
The Astrophysical Journal Letters, 2023 We present the first JWST spectral energy distribution of a Y dwarf. This spectral energy distribution of the Y0 dwarf WISE J035934.06−540154.6 consists of low-resolution ( λ /Δ λ ∼100) spectroscopy from 1–12 μ m and three photometric points at 15, 18 ...
Samuel A. Beiler +5 more
doaj +4 more sources
JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary: WISE J033605.05–014350.4 [PDF]
The Astrophysical Journal Letters, 2023 We report the discovery of the first brown dwarf binary system with a Y dwarf primary, WISE J033605.05−014350.4, observed with NIRCam on JWST with the F150W and F480M filters.
Per Calissendorff +27 more
doaj +4 more sources
Y Dwarfs: The Challenge of Discovering the Coldest Substellar Population in the Solar Neighborhood [PDF]
arXiv, 2018 Stars form in the Galaxy with a wide range in mass. If the mass is below 7% of the Sun's, then the object does not become hot enough for stable hydrogen burning. These substellar objects are called brown dwarfs. Maps of the sky at infrared wavelengths have found large numbers of brown dwarfs.
S. K. Leggett
arxiv +6 more sources
Optical properties of Y dwarfs observed with the Gran Telescopio Canarias [PDF]
arXivObservations of five Y dwarfs with three optical and near-infrared instruments at the 10.4 m Gran Telescopio Canarias are reported. Deep images of the five targets and a low-resolution far-red optical spectrum for one of the targets were obtained. One of the Y dwarfs, WISE J173835+273258 (Y0), was clearly detected in the optical (z- and i-bands) and ...
E. L. Martı́n +5 more
arxiv +6 more sources
Astrometry and Photometry for ≈1000 L, T, and Y Dwarfs from the UKIRT Hemisphere Survey [PDF]
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 +3 more sources
Near-infrared photometry of Y dwarfs: low ammonia abundance and the onset of water clouds [PDF]
The Astrophysical Journal, 2014 We present new near-infrared photometry for seven late-type T dwarfs and nine Y-type dwarfs, and lower limit magnitudes for a tenth Y dwarf, obtained at Gemini Observatory. We also present a reanalysis of H-band imaging data from the Keck Observatory Archive, for an eleventh Y dwarf.
S. K. Leggett +3 more
arxiv +6 more sources
JWST 1.5 μm and 4.8 μm Photometry of Y Dwarfs
The Astronomical JournalBrown dwarfs lack nuclear fusion and cool with time; the coldest known have an effective temperature below 500 K, and are known as Y dwarfs. We present a James Webb Space Telescope (JWST) photometric data set of Y dwarfs: 23 were imaged in wide-field ...
Loïc Albert +22 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.
K. A. Marsh +7 more
arxiv +9 more sources