Results 31 to 40 of about 51,136 (327)

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, Jeffrey A. Munn, Frederick J. Vrba, Justice Bruursema, Scott E. Dahm, Stephen J. Williams, Michael C. Liu, Bryan N. Dorland   +7 more
doaj   +1 more source

Brown Dwarfs in the Hyades and Beyond? [PDF]

The Astronomical Journal, 1999
We have used both the Low-Resolution Imaging Spectrograph and the HIRES echelle spectrograph on the Keck telescopes to obtain spectra of twelve candidate members of the Hyades cluster identified by Leggett and Hawkins (1988, 1989). All of the objects are chromospherically-active, late-type M-dwarfs, with H$ $ equivalent widths varying from 1 to 30 ...
I. Neill Reid, Suzanne L. Hawley
openaire   +3 more sources

Little Red Dots or Brown Dwarfs? NIRSpec Discovery of Three Distant Brown Dwarfs Masquerading as NIRCam-selected Highly Reddened Active Galactic Nuclei

The Astrophysical Journal Letters, 2023
Cold, substellar objects such as brown dwarfs have long been recognized as contaminants in color-selected samples of active galactic nuclei (AGNs). In particular, their near- to mid-infrared colors (1–5 μ m) can closely resemble the V-shaped ( f _λ ...
Danial Langeroodi, Jens Hjorth
doaj   +1 more source

Variability of Brown Dwarfs [PDF]

, 2018
Accepted chapter in the "Handbook of Exoplanets ...
openaire   +4 more sources

On the mass segregation of stars and brown dwarfs in Taurus [PDF]

, 2010
We use the new minimum spanning tree (MST) method to look for mass segregation in the Taurus association. The method computes the ratio of MST lengths of any chosen subset of objects, including the most massive stars and brown dwarfs, to the MST lengths ...
Adams, Allison, Andersen, Bastian, Bate, Briceño, Briceño, Cartwright, Dobashi, Estelle Moraux, Gomez, Goodwin, Goodwin, Gouliermis, Guieu, Gutermuth, Güdel, Jerome Bouvier, Joergens, Kenyon, Kenyon, Kenyon, Kirk, Kirk, Kroupa, Kroupa, Littlefair, Luhman, Luhman, Luhman, Luhman, Luhman, Luhman, Manuel Güdel, Monin, Padoan, Padoan, Palla, Parker, Prim, Reipurth, Richard J. Allison, Richard J. Parker, Sabbi, Sana, Schmalzl, Siess, Simon P. Goodwin, Stamatellos, Sylvain Guieu, Thies, Ungerechts, Walter, Whitworth, Whitworth   +54 more
core   +2 more sources

Modeling Brown Dwarfs, L Dwarfs, and T Dwarfs [PDF]

Symposium - International Astronomical Union, 2003
In this contribution, I review a subset of our recent efforts in spectral and opacity modeling aimed at guiding the study of brown dwarfs, L dwarfs, and T dwarfs. I discuss theoretical calculations of the alkali line profiles, newly generated CrH opacities, new evidence for refractory rainout in T dwarfs from optical spectral measurements, and the ...
openaire   +3 more sources

Searching for weather in brown dwarfs [PDF]

Monthly Notices of the Royal Astronomical Society, 1999
8 pages, 7 figures. To appear in the Monthly Notices of the RAS.
C. G. Tinney, A. J. Tolley
openaire   +3 more sources

Interactions between brown-dwarf binaries and Sun-like stars

, 2012
Several mechanisms have been proposed for the formation of brown dwarfs, but there is as yet no consensus as to which -- if any -- are operative in nature. Any theory of brown dwarf formation must explain the observed statistics of brown dwarfs.
A. Natta, A. P. Whitworth, A. Toomre, A.J. Burgasser, A.J. Burgasser, A.J. Maury, A.P. Whitworth, A.P. Whitworth, A.P. Whitworth, B. Reipurth, C. McCarthy, C.F. Gammie, C.R. Gelino, D. Stamatellos, D. Stamatellos, D. Stamatellos, D. Stamatellos, D. Stamatellos, E. Moraux, E.T. Whelan, F. Comerón, H. Bouy, I. Thies, I. Thies, I.N. Reid, J. Sahlmann, J.K. Faherty, J.K. Faherty, K. Todorov, K.L. Luhman, K.L. Luhman, K.L. Luhman, L.M. Close, M. Ahmic, M. Kaplan, M.R. Bate, M.R. Bate, M.R. Bate, N. Lodieu, P. Girichidis, P. Hennebelle, P. Hennebelle, P. Padoan, R. Rebolo, S. Mohanty, S.K. Walch, S.P. Goodwin, S.P. Goodwin, S.S. Kumar, S.S.R. Offner, S.S.R. Offner, T. Nakajima   +51 more
core   +1 more source

A Study of the Diverse T Dwarf Population Revealed by WISE [PDF]

, 2012
We report the discovery of 87 new T dwarfs uncovered with the Wide-field Infrared Survey Explorer (WISE) and three brown dwarfs with extremely red near-infrared colors that exhibit characteristics of both L and T dwarfs.
Bailey, Vanessa, Beichman, Charles A., Bloom, Joshua S., Burgasser, Adam J., Cushing, Michael C., Eisenhardt, Peter R., Fortney, Jonathan J., Gelino, Christopher R., Griffith, Roger L., Hinz, Philip M., Kirkpatrick, J. Davy, Knox, Russell P., Lowrance, Patrick J., Mace, Gregory N., Marley, Mark S., Marsh, Kenneth A., McLean, Ian S., Mix, Katholeen, Morley, Caroline V., Rodigas, Timothy J., Saumon, Didier, Sheppard, Scott S., Skrutskie, Michael F., Stock, Nathan D., Thompson, Maggie A., Wright, Edward L.   +25 more
core   +1 more source

Intercomparison of Brown Dwarf Model Grids and Atmospheric Retrieval Using Machine Learning

The Astrophysical Journal, 2023
Understanding differences between substellar spectral data and models has proven to be a major challenge, especially for self-consistent model grids that are necessary for a thorough investigation of brown dwarf atmospheres.
Anna Lueber, Daniel Kitzmann, Chloe E. Fisher, Brendan P. Bowler, Adam J. Burgasser, Mark Marley, Kevin Heng   +6 more
doaj   +1 more source