An irradiated brown-dwarf companion to an accreting white dwarf [PDF]
Nature, 2016 Interacting compact binary systems provide a natural laboratory in which to study irradiated substellar objects. As the mass-losing secondary (donor) in these systems makes a transition from the stellar to the substellar regime, it is also irradiated by ...
J. V. H. Santisteban +9 more
semanticscholar +11 more sources
Lightning and charge processes in brown dwarf and exoplanet atmospheres. [PDF]
Philos Trans A Math Phys Eng Sci, 2019 The study of the composition of brown dwarf atmospheres helped to understand their formation and evolution. Similarly, the study of exoplanet atmospheres is expected to constrain their formation and evolutionary states.
Helling C, Rimmer PB.
europepmc +3 more sources
Exploration of the brown dwarf regime around solar-like stars by CoRoT [PDF]
, 2016 Aims. A summary of the CoRoT brown dwarf investigations are presented. Methods. Transiting brown dwarfs around solar like stars were studied by using the photometric time-series of CoRoT, and ground based radial velocity measurements. Results.
Csizmadia, Szilárd
core +4 more sources
Brown Dwarf Candidates in the JADES and CEERS Extragalactic Surveys [PDF]
Astrophysical Journal, 2023 By combining the James Webb Space Telescope (JWST)/NIRCam JADES and CEERS extragalactic data sets, we have uncovered a sample of 21 T and Y brown dwarf candidates at best-fit distances between 0.1 and 4.2 kpc. These sources were selected by targeting the
K. Hainline +15 more
semanticscholar +1 more source
The Sonora Brown Dwarf Atmosphere and Evolution Models. I. Model Description and Application to Cloudless Atmospheres in Rainout Chemical Equilibrium [PDF]
Astrophysical Journal, 2021 We present a new generation of substellar atmosphere and evolution models, appropriate for application to studies of L-, T-, and Y-type brown dwarfs and self-luminous extrasolar planets.
M. Marley +10 more
semanticscholar +1 more source
Probing the Extent of Vertical Mixing in Brown Dwarf Atmospheres with Disequilibrium Chemistry [PDF]
Astrophysical Journal, 2022 Evidence of disequilibrium chemistry due to vertical mixing in the atmospheres of many T- and Y-dwarfs has been inferred due to enhanced mixing ratios of CO and reduced NH3.
S. Mukherjee +29 more
semanticscholar +1 more source
The Brown Dwarf Kinematics Project (BDKP). V. Radial and Rotational Velocities of T Dwarfs from Keck/NIRSPEC High-resolution Spectroscopy [PDF]
Astrophysical Journal Supplement Series, 2021 We report multiepoch radial velocities, rotational velocities, and atmospheric parameters for 37 T-type brown dwarfs observed with Keck/NIRSPEC. Using a Markov Chain Monte Carlo forward-modeling method, we achieve median precisions of 0.5 and 0.9 km s−1 ...
C. Hsu +9 more
semanticscholar +1 more source
SCExAO/CHARIS Direct Imaging Discovery of a 20 au Separation, Low-mass Ratio Brown Dwarf Companion to an Accelerating Sun-like Star [PDF]
Astrophysical Journal Letters, 2020 We present the direct imaging discovery of a substellar companion to the nearby Sun-like star, HD 33632 Aa, at a projected separation of ∼20 au, obtained with SCExAO/CHARIS integral field spectroscopy complemented by Keck/NIRC2 thermal infrared imaging ...
T. Currie +29 more
semanticscholar +1 more source
Simplified 3D GCM modelling of the irradiated brown dwarf WD 0137−349B [PDF]
Monthly notices of the Royal Astronomical Society, 2020 White dwarf–brown dwarf short-period binaries (Porb ≲ 2 h) are some of the most extreme irradiated atmospheric environments known. These systems offer an opportunity to explore theoretical and modelling efforts of irradiated atmospheres different to ...
Elspeth K. H. Lee +6 more
semanticscholar +1 more source
On the Formation of Brown Dwarfs [PDF]
The Astronomical Journal, 2004 AbstractThe observational properties of brown dwarfs pose challenges to the theory of star formation. Because their masses are much smaller than the typical Jeans mass of interstellar clouds, brown dwarfs are most likely formed through secondary fragmentation processes, rather than through the direct collapse of a molecular cloud core.
Douglas N. C. Lin +2 more
openaire +5 more sources