Results 41 to 50 of about 4,134 (286)
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.
Adam J. Burgasser, Adam J. Burgasser
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Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs
EPJ Web of Conferences, 2013 We have used the 2MASS all-sky survey and WISE to look for ultracool dwarfs that are part of multiple systems containing main sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems ...
Pinfield D.J., Gomes J.I.
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Space Velocities of L‐ and T‐Type Dwarfs
The Astrophysical Journal, 2007 Accepted for publication in ...
R. Deshpande +7 more
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The Astrophysical Journal, 2023 Constraining L dwarf properties from their spectra is challenging. Near-infrared (NIR) spectra probe a limited range of pressures, while many species condense within their photospheres. Condensation creates two complexities: gas-phase species “rain out” (
Melanie J. Rowland +2 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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VLTI/GRAVITY Observations and Characterization of the Brown Dwarf Companion HD 72946 B
The Astrophysical Journal, 2023 Tension remains between the observed and modeled properties of substellar objects, but objects in binary orbits, with known dynamical masses, can provide a way forward.
William O. Balmer +100 more
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A Search for Companions to L Dwarfs [PDF]
Symposium - International Astronomical Union, 2003 We present the results of two imaging surveys for companions to low-luminosity dwarfs, one with Keck to a limiting magnitude of K = 20, and the other with HST to a limiting magnitude of I = 23. No companions were found at separations of 0″.5 to 20″.0, but seven companions were found within 0″.5. Based on sub-stellar evolutionary models, we estimate the
David W. Koerner +6 more
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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 ...
Gillian R. Knapp +4 more
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JWST/NIRSpec Observations of the Planetary Mass Companion TWA 27B
The Astrophysical Journal Letters, 2023 We present 1–5 μ m spectroscopy of the young planetary mass companion TWA 27B (2M1207B) performed with NIRSpec on board the James Webb Space Telescope. In these data, the fundamental band of CH _4 is absent, and the fundamental band of CO is weak.
K. L. Luhman +10 more
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The impact of frailty syndrome on skeletal muscle histology: preventive effects of exercise
FEBS Open Bio, EarlyView.Frailty syndrome exacerbates skeletal muscle degeneration via increased ECM deposition and myofiber loss. This study, using a murine model, demonstrates that endurance exercise attenuates these histopathological alterations, preserving muscle integrity. Findings support exercise as a viable strategy to counteract frailty‐induced musculoskeletal decline
Fujue Ji +3 more
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