A definition for the term "sub-brown dwarf" was put forward by the IAU Working Group on Extra-Solar Planets (WGESP), which defined it as a free-floating body found in young star clusters below the lower mass cut-off of brown dwarfs. Brown dwarfs may be fully convective, with no layers or chemical differentiation by depth. Meaning of sub-brown dwarf. through the collapse of a gas cloud) but that has a mass below the limiting mass for thermonuclear fusion of deuterium (about ). It was in her PhD thesis where she coined the term "brown dwarf" while researching small-mass objects that fail to stably fuse hydrogen. Lithium is generally present in brown dwarfs and not in low-mass stars. Free-floating sub-brown dwarfs can be observationally indistinguishable from rogue planets that originally formed around a star and were ejected from orbit, and on the other hand a sub-brown dwarf formed free-floating in a star cluster may get captured into orbit around a star. For most stars, gas and radiation pressure generated by the thermonuclear fusion reactions within the core of the star will support it against any further gravitational contraction.
The objects now called "brown dwarfs" were theorized to exist in the 1960s by Shiv S. Kumar and were originally called black dwarfs, a classification for dark substellar objects floating freely in space that were not massive enough to sustain hydrogen fusion. Brown dwarfs are sub-stellar objects that are something between stars and planets. GD 165B remained unique for almost a decade until the advent of the Two Micron All-Sky Survey (2MASS) which discovered many objects with similar colors and spectral features.
A sub-brown dwarf or planetary-mass brown dwarf is an astronomical object formed in the same manner as stars and brown dwarfs (i.e. A sub-brown dwarf or planetary-mass brown dwarf is an astronomical object formed in the same manner as stars and brown dwarfs (i.e. What does sub-brown dwarf mean? Such objects have been ejected from the planetary system in which they formed or have never been gravitationally bound to any star or brown dwarf. These generally are referred to as planets.
Despite their name, brown dwarfs are of different colors. STANDS4 LLC, 2020. Since then, over 1,800 brown dwarfs have been identified, even some very close to Earth like Epsilon Indi Ba and Bb, a pair of brown dwarfs gravitationally bound to a Sun-like star 12 light-years from the Sun, and Luhman 16, a binary system of brown dwarfs at 6.5 light-years from the Sun. Get instant definitions for any word that hits you anywhere on the web! Dwarf star alone generally refers to any main sequence star, a star of luminosity class V. Red dwarfs are low mass main sequence stars. Sub-brown dwarfs or brown sub-dwarfs (also, less commonly, grey dwarf or gray dwarf[citation needed]) are cold masses smaller than the low-mass cut-off for brown dwarfs. This page was last modified on 28 December 2015, at 01:08. This definition includes brown dwarfs and former stars similar to EF Eridani B, and can also include objects of planetary mass, regardless of their formation mechanism and whether or not they are associated with a primary star. There is no consensus whether these companions of brown dwarfs should be considered sub-brown dwarfs or planets. through the collapse of a gas cloud) but that has a mass below the limiting mass for thermonuclear fusion of deuterium (about 13 MJ).
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