Results 81 to 90 of about 10,855,464 (193)

Eight New Substellar Hyades Candidates from the UKIRT Hemisphere Survey

The Astronomical Journal
We have used the UKIRT Hemisphere Survey combined with the UKIDSS Galactic Cluster Survey, the UKIDSS Galactic Plane Survey, and the CatWISE2020 catalog to search for new substellar members of the nearest open cluster to the Sun, the Hyades.
Adam C. Schneider, Michael C. Cushing, Robert A. Stiller, Jeffrey A. Munn, Frederick J. Vrba, Justice Bruursema, Stephen J. Williams, Michael C. Liu, Alexia Bravo, Jacqueline K. Faherty, Austin Rothermich, Emily Calamari, Dan Caselden, Martin Kabatnik, Arttu Sainio, Thomas P. Bickle, William Pendrill, Nikolaj Stevnbak Andersen, Melina Thévenot   +18 more
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Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs. II. Properties of 11 T dwarfs [PDF]

The Astrophysical Journal, 2017
Abstract Brown dwarf spectra are rich in information revealing of the chemical and physical processes operating in their atmospheres. We apply a recently developed atmospheric retrieval tool to an ensemble of late-T dwarf (600–800 K) near-infrared (1–2.5 μm) spectra.
Michael R. Line, Mark S. Marley, Michael C. Liu, Ben Burningham, Caroline V. Morley, Natalie R. Hinkel, Johanna Teske, Jonathan J. Fortney, Richard Freedman, Roxana Lupu   +9 more
openaire   +2 more sources

Three Brown Dwarfs Masquerading as High-redshift Galaxies in JWST Observations

The Astrophysical Journal
We report the spectroscopic identification of three brown dwarf candidates—o005_s41280, o006_s00089, and o006_s35616—discovered in RUBIES using James Webb Space Telescope (JWST) Near-Infrared Spectrograph PRISM/CLEAR spectroscopy.
Zhijun Tu, Shu Wang, Xiaodian Chen, Jifeng Liu   +3 more
doaj   +1 more source

49 new T dwarfs identified using methane imaging [PDF]

, 2015
We present the discovery of 49 new photometrically classified T dwarfs from the combination of large infrared and optical surveys combined with follow-up Telescopio Nazionale Galileo photometry.
SMART, Richard Laurence, Cardoso, C., Lattanzi, MG, Smith, L., Spaandonk, L. van, van Spaandonk, L., Tinney, C. G., Magazzú, A, Baker, D., van Spaandonk, L, Cardoso, C. V., Andrei, A. H., Zhang, ZH, Smith, L. C., Tinney, CG ; https://orcid.org/, Pinfield, D. J., Burningham, B, Magazzú, A., Zhang, Z. H., Smart, RL, Cardoso, CV, Lattanzi, M., Dhital, S., MAGAZZU', Antonio, Pinfield, D.J., Andrei, A.H., Andrei, AH, LATTANZI, Mario Gilberto, Bucciarelli, B, Jones, H. R. A., Pinfield, DJ, Jones, H., BUCCIARELLI, Beatrice, Bucciarelli, B., Zhang, Z., Smith, LC, Burningham, B., Baker, D, Jones, H.R.A., Dhital, S, Smart, R., Pinfield, D., Tinney, C., Lattanzi, M. G., Jones, HRA, Smart, R. L., Andrei, A.   +46 more
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Discovery of 118 New Ultracool Dwarf Candidates Using Machine-learning Techniques

The Astronomical Journal
We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine-learning tool, named SMDET , applied to time-series images from the Wide-field Infrared Survey Explorer.
Hunter Brooks, Dan Caselden, J. Davy Kirkpatrick, Yadukrishna Raghu, Charles A. Elachi, Jake Grigorian, Asa Trek, Andrew Washburn, Hiro Higashimura, Aaron M. Meisner, Adam C. Schneider, Jacqueline K. Faherty, Federico Marocco, Christopher R. Gelino, Jonathan Gagné, Thomas P. Bickle, Shih-Yun Tang, Austin Rothermich, Adam J. Burgasser, Marc J. Kuchner, Paul Beaulieu, John Bell, Guillaume Colin, Giovanni Colombo, Alexandru Dereveanco, Deiby Pozo Flores, Konstantin Glebov, Leopold Gramaize, Les Hamlet, Ken Hinckley, Martin Kabatnik, Frank Kiwy, David W. Martin, Raúl F. Palma Méndez, Billy Pendrill, Lizzeth Ruiz, John Sanchez, Arttu Sainio, Jörg Schümann, Manfred Schonau, Christopher Tanner, Nikolaj Stevnbak, Andres Stenner, Melina Thévenot, Vinod Thakur, Nikita V. Voloshin, Zbigniew Wȩdracki, The Backyard Worlds: Planet 9 Collaboration   +47 more
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SDSS J080531.84+481233.0: An Unresolved L Dwarf/T Dwarf Binary [PDF]

The Astronomical Journal, 2007
SDSS J080531.84+481233.0 is a peculiar L-type dwarf that exhibits unusually blue near-infrared and mid-infrared colors and divergent optical (L4) and near-infrared (L9.5) spectral classifications. These peculiar spectral traits have been variously attributed to condensate cloud effects or subsolar metallicity.
openaire   +2 more sources

T Dwarf Discoveries by 2MASS

, 2001
8 pages, 3 figures, to appear in 4th Tetons Summer Conference on Galactic Structure, Stars, and the Interstellar ...
openaire   +2 more sources

Atmospheric Modeling of Brown Dwarfs [PDF]

, 2023
Brown dwarfs are celestial bodies outside the solar system that are more massive than planets, but less massive than stars. Since they are less massive than stars, they do not fuse hydrogen in their core, but rather cool slowly over time.
Roberts, Brayden, Lothringer, Joshua
core   +1 more source

Brown Dwarf Candidates in the JADES and CEERS Extragalactic Surveys

The Astrophysical Journal
By combining the James Webb Space Telescope (JWST)/NIRCam JADES and CEERS extragalactic data sets, we have uncovered a sample of 21 T and Y brown dwarf candidates at best-fit distances between 0.1 and 4.2 kpc. These sources were selected by targeting the
Kevin N. Hainline, Jakob M. Helton, Benjamin D. Johnson, Fengwu Sun, Michael W. Topping, Jarron M. Leisenring, William M. Baker, Daniel J. Eisenstein, Ryan Hausen, Raphael E. Hviding, Jianwei Lyu, Brant Robertson, Sandro Tacchella, Christina C. Williams, Christopher N. A. Willmer, Thomas L. Roellig   +15 more
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A Spitzer Space Telescope Exploration Science Program to Search for Y-dwarf Variability

The Astronomical Journal
We present the results of a Spitzer Space Telescope Exploration Science Program to search for and characterize variability in Y dwarfs. We observed 14 Y dwarfs over a 24 hr period at [3.6] and [4.5] and then repeated the observations a few months later ...
Michael C. Cushing, Jesica L. Trucks, Kevin K. Hardegree-Ullman, Adam J. Burgasser, Sean J. Carey, Jonathan J. Fortney, Christopher R. Gelino, John E. Gizis, J. Davy Kirkpatrick, Sandy Leggett, Gregory N. Mace, Mark S. Marley, Caroline V. Morley   +12 more
doaj   +1 more source