Results 11 to 20 of about 86,337 (303)

An Investigation of New Brown Dwarf Spectral Binary Candidates From the Backyard Worlds: Planet 9 Citizen Science Initiative

The Astronomical Journal, 2023
We present three new brown dwarf spectral-binary candidates: CWISE J072708.09−360729.2, CWISE J103604.84−514424.4, and CWISE J134446.62−732053.9, discovered by citizen scientists through the Backyard Worlds: Planet 9 project.
Alexia Bravo, Adam C. Schneider, Daniella Bardalez Gagliuffi, Adam J. Burgasser, Aaron M. Meisner, J. Davy Kirkpatrick, Jacqueline K. Faherty, Marc J. Kuchner, Dan Caselden, Arttu Sainio, Les Hamlet, The Backyard Worlds: Planet 9 Collaboration   +11 more
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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
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Clouds, Brightening and Multiplicity Across the L Dwarf∕T Dwarf Transition [PDF]

AIP Conference Proceedings, 2009
The transition between the two lowest-luminosity spectral classes of brown dwarfs--the L dwarfs and T dwarfs--is traversed by nearly all brown dwarfs as they cool over time. Yet distinct features of this transition, such as the "J-band bump" and an unusually high rate of multiplicity, remain outstanding problems, although evidence points to condensate ...
Adam J. Burgasser, Eric Stempels
openaire   +2 more sources

The Classification of T Dwarfs [PDF]

Symposium - International Astronomical Union, 2003
The discovery of many cool brown dwarfs similar to Gliese 229B has led to the definition of a new spectral class, the T dwarfs, whose 1–2.5 μm spectra exhibit signatures of CH4 absorption. Two classification schemes have been proposed for these objects by Burgasser et al. and Geballe et al.
Adam J. Burgasser, Thomas R. Geballe, David A. Golimowski, Sandy K. Leggett, J. Davy Kirkpatrick, Gillian R. Knapp, Xiaohui Fan   +6 more
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Young T-dwarf candidates in IC 348 [PDF]

Astronomy & Astrophysics, 2009
The determination of the lower-end of the initial mass function (IMF) provides strong constraints on star formation theories. We report here on a search for isolated planetary-mass objects in the 3 Myr-old star-forming region IC 348. Deep, narrowband CH4off and CH4on images were obtained with CFHT/WIRCam over 0.11 sq.deg.
Burgess, A. S. M., Moraux, E., Bouvier, J., Marmo, C., Albert, L., Bouy, H.   +5 more
openaire   +3 more sources

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
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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   +2 more sources

Exploring the Extremes: Characterizing a New Population of Old and Cold Brown Dwarfs

The Astronomical Journal, 2023
Mapping out the populations of thick disk and halo brown dwarfs is important for understanding the metallicity dependence of low-temperature atmospheres and the substellar mass function.
Aaron M. Meisner, S. K. Leggett, Sarah E. Logsdon, Adam C. Schneider, Pascal Tremblin, Mark Phillips   +5 more
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The ultracool-field dwarf luminosity-function and space density from the Canada-France Brown Dwarf Survey [PDF]

, 2010
Context. Thanks to recent and ongoing large scale surveys, hundreds of brown dwarfs have been discovered in the last decade. The Canada-France Brown Dwarf Survey is a wide-field survey for cool brown dwarfs conducted with the MegaCam camera on the Canada-
Allen, Basri, Bertin, Bertin, Bouy, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burningham, Burningham, Burningham, C. J. Willott, C. Reylé, Caballero, Chabrier, Chiu, Cruz, Cruz, Dahn, Delfosse, Delorme, Delorme, Drory, E. Artigau, Fan, Felten, Freytag, Fukugita, G. J. Hill, Geballe, Geballe, Gizis, Golimowski, Gould, Joergens, Kirkpatrick, Kirkpatrick, Kirkpatrick, Knapp, L. Albert, L. Malo, Lawrence, Leggett, Luhman, Mancini, Martín, Metchev, Moraux, Nakajima, P. Delorme, Pinfield, R. Doyon, Rebolo, Reid, Robin, Ruiz, Schmidt, Skrutskie, Stauffer, Stobie, T. Forveille, Taylor, Tinney, Tinney, Vrba, Warren, West, Willott, Willott, Willott, X. Delfosse, York   +73 more
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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