Results 11 to 20 of about 15,774,260 (349)

BOSS Ultracool Dwarfs I: Colors and Magnetic Activity of M and L Dwarfs

The Astronomical Journal, 2015
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 ...
West, Andrew A., Schneider, Doanld P., Bochanski, John J., Hawley, Suzanne L., Schmidt, Sarah J., Davenport, James R. A., Ge, Jian   +6 more
core   +3 more sources

Parallaxes of Five L Dwarfs with a Robotic Telescope [PDF]

Publications of the Astronomical Society of the Pacific, 2014
We report the parallax and proper motion of five L dwarfs obtained with observations from the robotic Liverpool Telescope. Our derived proper motions are consistent with published values and have considerably smaller errors.
Murray, D. N., Pinfield, D.J., Steele, I.A., Andrei, A.H., Jones, H. R. A., Shao, Z., Smart, R.L., Clarke, J. R. A., Zhang, Z., Yu, J., Steele, I. A., Burningham, B., Andrei, A. H., Jones, H.R.A., Sozzetti, A., Marocco, F., Pinfield, D. J., Leigh, C. J., Burgasser, A. J., Wang, Y., Leigh, C.J., Smart, R. L., Cruz, K. L.   +22 more
core   +4 more sources

Proper motions of field L and T dwarfs

Monthly Notices of the Royal Astronomical Society, 2008
The proper motion measurements for 143 previously known L and T dwarfs are presented. From this sample we identify and discuss 8 high velocity L dwarfs. We also find 4 new wide common proper motion binaries/multiple systems.
R F Jameson, Sarah L Casewell, N Lodieu
exaly   +3 more sources

Space velocities of L- and T-TYPE dwarfs

The Astrophysical Journal, 2007
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. We have confirmed that the radial velocity of G1 570D is coincident with that of
Zapatero Osorio, M. R., Martin, E. L., Deshpande, R., Wainscoat, R. J., Béjar, V. J. S., Bouy, H.   +5 more
core   +4 more sources

UNCOVER: JWST Spectroscopy of Three Cold Brown Dwarfs at Kiloparsec-scale Distances [PDF]

The Astrophysical Journal, 2023
We report JWST/NIRSpec spectra of three distant T-type brown dwarfs identified in the Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization (UNCOVER) survey of the Abell 2744 lensing field.
Adam J. Burgasser, Rachel Bezanson, Ivo Labbe, Gabriel Brammer, Sam E. Cutler, Lukas J. Furtak, Jenny E. Greene, Roman Gerasimov, Joel Leja, Richard Pan, Sedona H. Price, Bingjie Wang, John R. Weaver, Katherine E. Whitaker, Seiji Fujimoto, Vasily Kokorev, Pratika Dayal, Themiya Nanayakkara, Christina C. Williams, Danilo Marchesini, Adi Zitrin, Pieter van Dokkum   +21 more
doaj   +2 more sources

The Brown Dwarf Kinematics Project (BDKP). V. Radial and Rotational Velocities of T Dwarfs from Keck/NIRSPEC High-resolution Spectroscopy [PDF]

Astrophysical Journal Supplement Series, 2021
We report multiepoch radial velocities, rotational velocities, and atmospheric parameters for 37 T-type brown dwarfs observed with Keck/NIRSPEC. Using a Markov Chain Monte Carlo forward-modeling method, we achieve median precisions of 0.5 and 0.9 km s−1 ...
Chih-Chun Hsu, A. Burgasser, C. Theissen, C. Gelino, Jessica L. Birky, S. Diamant, Daniella C. Bardalez Gagliuffi, C. Aganze, C. Blake, J. Faherty   +9 more
semanticscholar   +1 more source

The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0–T8 Dwarfs with UKIRT [PDF]

Astronomical Journal, 2020
We present parallaxes, proper motions, and J-band photometry for 348 L and T dwarfs measured using the wide-field near-infrared camera WFCAM on the United Kingdom Infrared Telescope.
W. Best, Michael C. Liu, E. Magnier, T. Dupuy   +3 more
semanticscholar   +1 more source

The Hawaii Infrared Parallax Program. VI. The Fundamental Properties of 1000+ Ultracool Dwarfs and Planetary-mass Objects Using Optical to Mid-infrared Spectral Energy Distributions and Comparison to BT-Settl and ATMO 2020 Model Atmospheres

Astrophysical Journal, 2023
We derive the bolometric luminosities (L bol) of 865 field-age and 189 young ultracool dwarfs (spectral types M6–T9, including 40 new discoveries presented here) by directly integrating flux-calibrated optical to mid-infrared (MIR) spectral energy ...
A. Sanghi, Michael C. Liu, W. Best, T. Dupuy, R. Siverd, Zhoujian Zhang, Spencer A. Hurt, E. Magnier, K. Aller, N. Deacon   +9 more
semanticscholar   +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, Adam J. Burgasser, Justice Bruursema, Jeffrey A. Munn, Frederick J. Vrba, Dan Caselden, Martin Kabatnik, Austin Rothermich, Arttu Sainio, Thomas P. Bickle, Scott E. Dahm, Aaron M. Meisner, J. Davy Kirkpatrick, Genaro Suárez, Jonathan Gagné, Jacqueline K. Faherty, Johanna M. Vos, Marc J. Kuchner, Stephen J. Williams, Daniella Bardalez Gagliuffi, Christian Aganze, Chih-Chun Hsu, Christopher Theissen, Michael C. Cushing, Federico Marocco, Sarah Casewell, The Backyard Worlds: Planet 9 Collaboration   +26 more
doaj   +1 more source

Four Nearby L Dwarfs [PDF]

The Astronomical Journal, 2000
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 5000Åin the L0 dwarf 2MASSJ0746+2000 and the L4 dwarf 2MASSJ0036+1840, allowing the identification of absorption bands due to MgH and CaOH.
Reid, I. Neill, Kirkpatrick, J. Davy, Gizis, J. E., Dahn, C. C., Monet, D. G., Williams, R. J., Liebert, James, Burgasser, A. J.   +7 more
openaire   +2 more sources