Results 101 to 110 of about 10,855,464 (193)

Comparing Grid Model Fitting Methodologies for Low-temperature Atmospheres: Markov Chain Monte Carlo versus Random Forest Retrieval

The Astrophysical Journal
The atmospheres of low-temperature stars, brown dwarfs, and exoplanets are challenging to model due to strong molecular features and complex gas and condensate chemistry.
Anna Lueber, Adam J. Burgasser
doaj   +1 more source

Methane Opacities in T Dwarf Atmospheres

, 2002
4 pages, 2 figures, uses newpasp.sty, to be published ...
Homeier, D., Hauschildt, P. H., Allard, F.   +2 more
openaire   +2 more sources

Parallaxes of L and T dwarfs

, 2008
. We discuss a new program to measure the parallaxes of a number of L and T dwarfs, objects that bridge the gap between M dwarfs and planets. This pilot project tests the feasibility of using large telescopes with infrared detectors to determine ...
H. R. A. Jones, R. L. Smart, G. E. Bromage, D. W. Kurtz, C. A. L. Bailer-jones   +4 more
core  

Infrared Classification of L and T Dwarfs

, 2001
We use new and published medium resolution 0.6--2.5 $μ$m spectra of L and T dwarfs to develop a unified classification system for both of these new spectral classes. Two indices of the system at 1.2 $μ$m and 1.5 $μ$m are based on nearby absorption bands of water vapor and two are associated with methane bands near 1.6 $μ$m and 2.2 $μ$m.
Geballe, T. R., Knapp, G. R., Leggett, S. K., Fan, X., Golimowski, D. A.   +4 more
openaire   +2 more sources

Two T dwarfs from the UKIDSS Early Data Release

, 2020
Context. We report on the first ultracool dwarf discoveries from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey Early Data Release (LAS EDR), in particular the discovery of T dwarfs which are fainter and more distant than those found using
G Chabrier, N C Hambly, D Barrado Y Navascués, T R Kendall, A Day-Jones, S T Hodgkin, S Folkes, M J Mccaughrean, D J Pinfield, E L Martín, R F Jameson, T Nakajima, N Deacon, P D Dobbie, F Clarke, S Dye, P C Hewett, M R Zapatero Osorio, G Carraro, F Allard, S L Casewell, N Tadashi, A Magazzù, C G Tinney, Y V Pavlenko, M Tamura, P W Lucas, N Lodieu, R J Chappelle, H R A Jones, M Ishii, I Baraffe, S K Leggett   +32 more
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A search for transiting satellites around L and T dwarfs [PDF]

2023The L and T spectral types extend the traditional Harvard stellar classification system to include objects that are less massive, cooler, and spectroscopically distinct from the latest M dwarfs.
Tamburo, Patrick Colin
core  

The Sonora Substellar Atmosphere Models. VI. Red Diamondback: Extending Diamondback with SPHINX for Brown Dwarf Early Evolution

The Astrophysical Journal
We extend the Sonora Diamondback brown dwarf evolution models to higher effective temperatures to treat the evolution of younger, higher-mass objects. Due to an upper temperature limit of T _eff  =  2400 K in the original Sonora Diamondback model grid ...
C. Evan Davis, Jonathan J. Fortney, Aishwarya Iyer, Sagnick Mukherjee, Caroline V. Morley, Mark S. Marley, Michael Line, Philip S. Muirhead   +7 more
doaj   +1 more source

The Impact of Irradiation on the Radius and Thermal Evolution of Transiting Brown Dwarfs

The Astrophysical Journal
Masses and radii of transiting brown dwarfs can be measured directly, in contrast to isolated field brown dwarfs, whose mass and radius inferences are model dependent.
Sagnick Mukherjee, Jonathan J. Fortney, Theron W. Carmichael, C. Evan Davis, Daniel P. Thorngren   +4 more
doaj   +1 more source

Clouds and chemistry across the brown dwarf T-Y sequence: Insights from JWST atmospheric retrievals

Astronomy & Astrophysics
The James Webb Space Telescope offers exceptional spectral resolution and wavelength coverage, which are essential for studying the coldest brown dwarfs, particularly Y dwarfs.
Lueber A., Kitzmann D., Heng K.
doaj   +1 more source

Spectroscopic Follow-up of the CFBDS T Dwarf Candidates

, 2008
The Canada‐France Brown Dwarfs Survey (CFBDS) will be covering approximately 900 sq. deg. in the i and z bands using MegaCam at CFHT to search for cool brown dwarfs and determine L and T dwarfs density functions.
Delfosse, X., Artigau, E., Forveille, T., Reylé, C., Albert, L., Delorme, P., Willott, C.   +6 more
core   +1 more source