Results 61 to 70 of about 10,855,464 (193)
Time-resolved Optical Polarization Monitoring of the Most Variable Brown Dwarf
The Astronomical Journal, 2023 Recent atmospheric models for brown dwarfs suggest that the existence of clouds in substellar objects is not needed to reproduce their spectra, nor their rotationally induced photometric variability, believed to be due to the heterogeneous cloud coverage
Elena Manjavacas +5 more
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Exploration of the Near-infrared Colors of Cold Y Dwarfs from the Ground and Space
The Astrophysical JournalThe James Webb Space Telescope (JWST) has provided critical mid-infrared data for cold brown dwarfs. It has also provided low-resolution near-infrared spectra, and for faint sources these are the first spectra at these wavelengths.
S. K. Leggett +2 more
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The Astrophysical Journal, 2023 Brown dwarf spectra offer vital testbeds for our understanding of the chemical and physical processes that sculpt substellar atmospheres. Recently, atmospheric retrieval approaches have been successfully applied to low-resolution ( R ∼ 100) spectra of L,
Callie E. Hood +3 more
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The 2MASS Wide-Field T Dwarf Search. II. Discovery of Three T Dwarfs in the Southern Hemisphere [PDF]
The Astronomical Journal, 2003 We present the discovery of three new Southern Hemisphere T dwarfs identified in the Two Micron All Sky Survey. These objects, 2MASS 0348-6022, 2MASS 0516-0445, and 2MASS 2228-4310, have classifications T7, T5.5, and T6.5, respectively. Using linear absolute magnitude/spectral type relations derived from T dwarfs with measured parallaxes, we estimate ...
Burgasser, Adam J. +2 more
openaire +2 more sources
Gray Spectral Variability in Three Brown Dwarfs Observed by HST/WFC3 Time-series Observations
The Astrophysical JournalThe L/T transition is a critical evolutionary stage for brown dwarfs and self-luminous giant planets. L/T transition brown dwarfs are more likely to be spectroscopically variable, and their high-amplitude variability probes distributions in their clouds ...
Madalyn F. Chapleski, Yifan Zhou
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Extending the Canada-France Brown Dwarf Survey to the near infrared
EPJ Web of Conferences, 2011 We present the first results of the Canada-France Brown Dwarfs Survey-InfraRed, hereafter CFBDSIR, our near infrared extension to the optical wide field survey CFBDS.
Bertin E. +8 more
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, 2004 4 pages, 6 figures, proceedings from the 13th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, Hamburg, Germany, July 2004, ESA-SP, in ...
Marley, M. S. +2 more
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Optical Spectroscopy of T Dwarfs
, 2001 2 pages, 1 figure, to appear in proceedings of 4th Tetons Summer Conference on Galactic Structure, Stars, and the Interstellar Medium, ed. M.
Burgasser, Adam J., Kirkpatrick, J. Davy
openaire +2 more sources
Photospheric Properties of L and T Dwarfs [PDF]
Symposium - International Astronomical Union, 2003 The photospheric spectra of all L and T dwarfs contain strong molecular bands and alkali absorption features, and those of L and early T dwarfs are also affected by dust. Although work on atmospheric models is addressing the treatment of dust, and is increasing the completeness of molecular opacity linelists, the effective temperatures of L and T ...
S. K. Leggett +4 more
openaire +1 more source
Physical Parameters and Properties of 20 Cold Brown Dwarfs in JWST
The Astrophysical JournalWe present a comprehensive analysis of 20 T and Y dwarfs using spectroscopy from the Near-Infrared Spectrograph (NIRSpec) CLEAR/PRISM and Mid-Infrared Instrument (MIRI) low-resolution spectrometer instruments on the James Webb Space Telescope.
Zhijun Tu, Shu Wang, Jifeng Liu
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