Results 51 to 60 of about 1,220,192 (373)
The Astronomical Journal, 2023 Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs.
Kyle Franson +30 more
doaj +1 more source
New ultra-cool and brown dwarf candidates in Gaia DR2 [PDF]
Astronomy & Astrophysics, 2018 Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources. The resulting Hertzsprung–Russel diagram reveals fine structures throughout the mass range. Aims.
C. Reylé
semanticscholar +1 more source
SMA observations of the proto brown dwarf candidate SSTB213 J041757 [PDF]
, 2014 Context. The previously identified source SSTB213 J041757 is a proto brown dwarf candidate in Taurus, which has two possible components A and B. It was found that component B is probably a class 0/I proto brown dwarf associated with an extended envelope.
C. -f. Lee +4 more
core +1 more source
Cloud Atlas: Rotational Modulations in the L/T Transition Brown Dwarf Companion HN Peg B [PDF]
, 2018 Time-resolved observations of brown dwarfs’ rotational modulations provide powerful insights into the properties of condensate clouds in ultra-cool atmospheres.
Yifan Zhou +13 more
semanticscholar +1 more source
Brown Dwarfs in the Hyades and Beyond? [PDF]
The Astronomical Journal, 1999 We have used both the Low-Resolution Imaging Spectrograph and the HIRES echelle spectrograph on the Keck telescopes to obtain spectra of twelve candidate members of the Hyades cluster identified by Leggett and Hawkins (1988, 1989). All of the objects are chromospherically-active, late-type M-dwarfs, with H$ $ equivalent widths varying from 1 to 30 ...
I. Neill Reid, Suzanne L. Hawley
openaire +3 more sources
Variability of Brown Dwarfs [PDF]
, 2018 Accepted chapter in the "Handbook of Exoplanets ...
openaire +4 more sources
JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary: WISE J033605.05–014350.4
The Astrophysical Journal Letters, 2023 We report the discovery of the first brown dwarf binary system with a Y dwarf primary, WISE J033605.05−014350.4, observed with NIRCam on JWST with the F150W and F480M filters.
Per Calissendorff +27 more
doaj +1 more source
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 +3 more sources
Searching for weather in brown dwarfs [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 8 pages, 7 figures. To appear in the Monthly Notices of the RAS.
C. G. Tinney, A. J. Tolley
openaire +3 more sources
Brown dwarfs in retrogradely precessing cataclysmic variables?
EPJ Web of Conferences, 2011 We compare Smoothed Particle Hydrodynamic simulations of retrogradely precessing accretion disks that have a white dwarf primary and a main sequence secondary with observational data and with theory on retrograde precession via tidal torques like those ...
Martin E.L. +2 more
doaj +1 more source