Results 11 to 20 of about 1,448,608 (292)
Brown Dwarf Companions to White Dwarfs [PDF]
AIP Conference Proceedings, 2011 Brown dwarf companions to white dwarfs are rare, but recent infra-red surveys are slowly reveal- ing examples. We present new observations of the post-common envelope binary WD0137-349, which reveals the effects of irradiation on the ~ 0.05M* secondary, and new observations of GD 1400 which show that it too is a close, post-comon envelope system.
Matt R. Burleigh +13 more
core +9 more sources
Binary brown dwarfs in the Galactic halo? [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 Microlensing events towards the Large Magellanic Cloud entail that a sizable fraction of dark matter is in the form of MACHOs (Massive Astrophysical Compact Halo Objects), presumably located in the halo of the Galaxy. Within the present uncertainties, brown dwarfs are a viable candidate for MACHOs.
DE PAOLIS, Francesco +3 more
openaire +7 more sources
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.
Jiang, Ing-Guey +2 more
openaire +3 more sources
Atmospheric Modeling of Brown Dwarfs [PDF]
, 2023 Brown dwarfs are celestial bodies outside the solar system that are more massive than planets, but less massive than stars. Since they are less massive than stars, they do not fuse hydrogen in their core, but rather cool slowly over time.
Roberts, Brayden, Lothringer, Joshua
core +1 more source
The formation of brown dwarfs: theory
, 2007 We review five mechanisms for forming brown dwarfs: (1) turbulent fragmentation of molecular clouds, producing very-low-mass prestellar cores by shock compression; (2) collapse and fragmentation of more massive prestellar cores; (3) disk fragmentation ...
Nordlund, Ake +4 more
core +4 more sources
An Eccentric Brown Dwarf Eclipsing an M dwarf
The Astronomical Journal, 2022 Abstract We report the discovery of an M = 67 ± 2M J brown dwarf transiting the early M dwarf TOI-2119 on an eccentric orbit (e = 0.3362 ± 0.0005) at an orbital period of 7.200861 ± 0.000005 days. We confirm the brown dwarf nature of the transiting companion using a combination of ground-based and space-based photometry
Caleb I. Cañas +18 more
openaire +2 more sources
Searches for brown dwarfs [PDF]
International Astronomical Union Colloquium, 1994 AbstractThis review attempts a brief summary of the numerous and diverse searches for the so-called brown dwarfs, substellar objects having masses between giant planets and the lowest mass M dwarf stars.
openaire +1 more source
The Astrophysical Journal, 2014 15 pages, 10 figures, accepted for publication in ...
L. Ricci +5 more
openaire +5 more sources
DA white dwarfs in Sloan Digital Sky Survey Data Release 7 and a search for infrared excess emission [PDF]
, 2011 We present a method which uses colour–colour cuts on the Sloan Digital Sky Survey (SDSS) photometry to select white dwarfs with hydrogen-rich (DA) atmospheres without the recourse to spectroscopy.
Farihi, J. +19 more
core +1 more source
The “Mysterious” Origin of Brown Dwarfs [PDF]
The Astrophysical Journal, 2004 11 pages, 3 figures, ApJ submitted Error in equation 1 has been corrected.
Padoan, Paolo, Nordlund, AAke
openaire +2 more sources