20 de outubro de 2020 , por
At the high end of their mass range (60-90 Jupiter masses), the volume of a brown dwarf is governed primarily by electron degeneracy pressure, as it is in white dwarfs; at the low end of the range (1-10 Jupiter masses), their volume is governed primarily by Coulomb pressure, as it is in planets. Some astronomers believe that there is in fact no actual black-and-white line separating light brown dwarfs from heavy planets, and that rather there is a continuum. Cha 110913-773444 is the smallest brown dwarf found to date (8 Jupiter masses)and if it formed a solar system it would be the smallest object to have one. A brown dwarf Cha 110913-773444 located 500 light years away in the constellation Chamaeleon may be in the process of forming a mini solar system. General size comparison between a low mass star, a brown dwarf, and the planet Jupiter. GD 165B remained unique for almost a decade until the advent of the Two Micron All Sky Survey (2MASS) when Davy Kirkpatrick, out of the California Institute of Technology, and others discovered many objects with similar colors and spectral features. Currently, if a body has a mass of more than 12 Jupiter masses, heavy enough to fuse deuterium, it is considered to be a brown dwarf, whereas those bodies under that mass are considered planets. For example, brown dwarfs exhibit convection in their atmospheres. The spectrum of this object is similar to that of Jupiter. NIR classification schemes for T dwarfs have recently been developed by Adam Burgasser and Tom Geballe. Methane: Unlike stars, older brown dwarfs are sometimes cool enough that over very long periods of time their atmospheres can gather observable quantities of methane. Teide 1, an M8 object in the, 1998: First X-ray-emitting brown dwarf found. Luminosity: Main sequence stars cool, but eventually reach a minimum luminosity which they can sustain through steady fusion.
AMNH on Aug 17, 2020 2:25 pm. We could speak of brown dwarf masses as fractions of our sun’s mass, but astronomers typically use Jupiter’s mass as a standard measure. View larger. The EarthSky team has a blast bringing you daily updates on your cosmos and world. For many years, efforts to discover brown dwarfs were frustrating and searches to find them seemed fruitless. Brown dwarfs are unable to sustain the fusion of hydrogen into helium, a process that powers the light from normal stars like the Sun. Currently there is a large ambiguity as to what separates a brown dwarf from a giant planet at very low brown dwarf masses (~12 Jupiter masses).
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