brown dwarf


Also found in: Encyclopedia, Wikipedia.
Related to brown dwarf: white dwarf

brown dwarf

n.
A celestial body that is more massive than a gas giant planet but has insufficient mass to sustain the hydrogen fusion reactions that produce radiant energy in normal stars.

brown dwarf

n
(Astronomy) a type of celestial body midway in mass between a large planet and a small star

brown′ dwarf′


n.
a cold, dark star that is too small to initiate the nuclear reactions that generate heat and light.

brown dwarf

(broun)
A celestial body that is similar to a star but does not emit light because it does not have enough mass to ignite internal nuclear fusion. See Note at dwarf star.
Translations
ruskea kääpiö
barna törpe
brun dverg
brun dvärg
References in periodicals archive ?
Basmah Riaz (Max Planck Institute for Extraterrestrial Physics, Germany) and colleagues studied a young brown dwarf in the 3 million-year-old Sigma Orionis star cluster.
Had this star formed with only a slightly lower mass, the fusion reaction of hydrogen in its core could not be sustained, and the star would instead have transformed into a brown dwarf.
In May, a team of astronomers announced that they have discovered a small substellar "failure" called a brown dwarf that once had been a true star--before it was ravaged by its hungry white dwarf companion.
WISEA 1147 is one of the few free-floating worlds where astronomers can begin to point to its likely origins as a brown dwarf and not a planet.
Today, the coolest known starlike orb is a brown dwarf discovered last year.
ISLAMABAD -- Astronomers have discovered the first aurora outside our solar system, around a brown dwarf about 18 light years away from Earth and up to 10,000 times more powerful than any previously seen.
A brown dwarf, or "failed star", is an object more massive than a planet yet too small to trigger the thermonuclear reactions that power stars.
But scientists estimate it is probably a brown dwarf rather than a planet since brown dwarfs are known to be fairly common.
The newfound coldest brown dwarf is named WISE J085510.
They peered out into space at a brown dwarf named ISO-Oph 102.
Solar system planetary scientists, brown dwarf and exoplanet observers and theoreticians, molecular spectroscopists, and instrument specialists discuss methods and findings in the composition of atmospheres around planets beyond the solar system.
This opens a new window and provides an important clue for the brown dwarf formation theory.