Results 1 to 10 of about 83,683 (249)
The Astronomical Journal, 1999 We present spectroscopic, photometric and astrometric observations of four bright L dwarfs identified in the course of the 2MASS near-infrared survey. Our spectroscopic data extend to wavelengths shortward of 5000\AA in the L0 dwarf 2MASSJ0746+2000 and ...
A. J. Burgasser +15 more
core +5 more sources
BOSS Ultracool Dwarfs I: Colors and Magnetic Activity of M and L dwarfs [PDF]
The Astronomical Journal, 2014 We present the colors and activity of ultracool (M7-L8) dwarfs from the Tenth Data Release of the Sloan Digital Sky Survey (SDSS). We combine previous samples of SDSS M and L dwarfs with new data obtained from the Baryon Oscillation Sky Survey (BOSS) to ...
Bochanski, John J. +6 more
core +4 more sources
Odessa Astronomical Publications, 2017 Theoretical spectra, of L-dwarfs (Teff
Ya. Pavlenko
doaj +2 more sources
Discovery of Four High Proper Motion L Dwarfs, Including a 10 pc L Dwarf at the L/T Transition [PDF]
The Astrophysical Journal, 2013 We discover four high proper motion L dwarfs by comparing the Wide-field Infrared Survey Explorer (WISE) to the Two Micron All Sky Survey (2MASS). WISE J140533.32+835030.5 is an L dwarf at the L/T transition with a proper motion of 0.85+/-0.02" yr^-1 ...
Castro, Philip J. +7 more
core +4 more sources
Space Velocities of L- and T-type Dwarfs [PDF]
The Astrophysical Journal, 2007 (Abridged) We have obtained radial velocities of a sample of 18 ultracool dwarfs (M6.5-T8) using high-resolution, near-infrared spectra obtained with NIRSPEC and the Keck II telescope.
Chen B. +17 more
core +5 more sources
L-dwarf Detection from SDSS Images using Improved Faster R-CNN
The Astronomical Journal, 2023 We present a data-driven approach to automatically detect L dwarfs from Sloan Digital Sky Survey (SDSS) images using an improved Faster R-CNN framework based on deep learning.
Zhi Cao +6 more
doaj +1 more source
Redder than Red: Discovery of an Exceptionally Red L/T Transition Dwarf
The Astrophysical Journal Letters, 2023 We present the discovery of CWISE J050626.96+073842.4 (CWISE J0506+0738), an L/T transition dwarf with extremely red near-infrared colors discovered through the Backyard Worlds: Planet 9 citizen science project. Photometry from UKIRT and CatWISE give a (
Adam C. Schneider +26 more
doaj +1 more source
The Astrophysical Journal Letters, 2023 We report direct observational evidence for a latitudinal dependence of dust cloud opacity in ultracool dwarfs, indicating that equatorial latitudes are cloudier than polar latitudes.
Genaro Suárez +4 more
doaj +1 more source
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
Keck Imaging of Binary L Dwarfs [PDF]
The Astrophysical Journal, 1999 LaTex manuscript in 13 pages, 3 postscript figures, Accepted for publication in the Letters of the Astrophysical Journal; Postscript pre-print version available at: http://www.hep.upenn.edu/PORG/papers/koerner99a ...
Koerner, D. W. +3 more
openaire +3 more sources