Results 11 to 20 of about 4,134 (286)
The Onset of Methane in L Dwarfs [PDF]
The Astrophysical Journal, 2000 We have detected weak absorption features produced by the strong nu(3) methane band at 3.3 microns in two L dwarfs, 2MASSW J1507476-162738 and 2MASSI J0825196+211552, classified by Kirkpatrick et al. (2000) as spectral types L5 and L7.5 respectively. These absorptions occur in objects warmer than any in which methane previously has been detected, and ...
Keith S. Noll +3 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 ...
Adam Burrows
+7 more sources
Clouds and Clearings in the Atmospheres of the L and T Dwarfs [PDF]
Symposium - International Astronomical Union, 2003 A sophisticated approach to condensate opacity is required to properly model the atmospheres of L and T dwarfs. Here we review different models for the treatment of condensates in brown dwarf atmospheres. We conclude that models which include both particle sedimentation and upwards transport of condensate (both gas and particles) provide the best fit ...
Didier Saumon +5 more
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Infrared Classification of L and T Dwarfs
, 2001 6 pages, 3 figures, 1 table; to be published in the Proceedings of the 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the ...
Geballe, T. R. +4 more
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A 2MASS L Dwarf Companion to the Nearby K Dwarf GJ 1048 [PDF]
The Astronomical Journal, 2001 We report the discovery of a probable L1 companion to the nearby K2 dwarf GJ 1048 using the Two Micron All-Sky Survey (2MASS). This source, 2MASSI J0235599-233120 or GJ 1048B, has 2MASS near-infrared colors and absolute magnitudes consistent with an early L dwarf companion with a projected separation of 250 A.U. The L1 spectral type is confirmed by far-
John C. Wilson +3 more
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Infrared Colors of L and T Dwarfs
, 2001 We discuss the behaviour of the JHKL'M' colors of L and T dwarfs, based on photometric and spectroscopic data obtained at the United Kingdom Infrared Telescope in Hawaii. We have measured the first accurate M' photometry for L and T dwarfs. The K-M' colors of T dwarfs are much bluer than predicted by published models, suggesting that CO may be more ...
Leggett, S. K. +4 more
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The Spectra and Classification of L and T Dwarfs
, 2001 10 pages, 6 figures, To be published in Proceedings of the 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the ...
Adam J. Burgasser
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, 2001 We present infrared spectra of brown dwarfs with spectral types from mid-L to T. The 0.9-2.5 $ $m spectra of three dwarfs found by the Sloan Digital Sky Survey contain absorption bands of both methane and carbon monoxide and bridge the gap between late L and previously observed T dwarfs.
Geballe, T. R. +5 more
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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
Mathematical Biosciences and Engineering, 2023 We consider the boundary value problem of finite beam deflection on elastic foundation with two point boundary conditions of the form $ u^{(p)}(-l) = u^{(q)}(-l) = u^{(r)}(l) = u^{(s)}(l) = 0 $, $ p < q $, $ r < s $, which we call elementary.
Sung Woo Choi
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