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http://www.redorbit.com/news/space/1112524727/astronomers-discover-radio-waves-from-brown-dwarf/
Astronomers Discover Radio Waves From Brown Dwarf
April 30, 2012
Penn State University astronomers have discovered record-breaking
radio waves from an ultra-cool star that is not much warmer than the
planet Jupiter.
The team used a giant 1,000-feet radio telescope at Arecibo, Puerto
Rica to look for radio signals from a class of objects known as brown
dwarfs. Brown dwarf’s bridge the gap between gas giant planets, and
hydrogen-fusing stars.
The astronomers found that a brown dwarf named J1047+21 that lies 33.6
light years away in the constellation Leo could help boost the odds of
discovering life in other places in the universe.
“This object is the coolest brown dwarf ever detected emitting radio
waves — it’s half the temperature of the previous record holder,
making it only about five times hotter than Jupiter,” Matthew Route, a
graduate student at Penn State and the lead author of the discovery
paper, said in a press release.
The newly discovered star has a surface temperature that is not much
higher than that of a giant plant, and is scarcely visible in optical
light.
The radio flares seen at the giant telescope show that the star has a
strong magnetic field, which could imply that the same could be true
of other similar stars, according to the researchers.
“We hope that in the future we’ll be able to detect yet colder brown
dwarfs, and possibly even giant planets around other stars,”
Wolszczan, an Evan Pugh Professor of Astronomy and Astrophysics and
the leader of the project, said.
He said the possibility that young, hot planets around other stars
could be detected in the same way the team did has implications for
the chances of finding life in other places in the Milky Way Galaxy.
“The Earth’s field protects life on its surface from harmful particles
of the solar wind,” Wolszczan said. “Knowing whether planetary
magnetic fields are common or not throughout the Galaxy will aid our
efforts to understand chances that life may exist beyond the Solar
System.”
Discovering the brown dwarf through radio signals helps broaden the
window through which astronomers are able to study the atmosphere and
interiors of this class of stars.
The researchers said that the brown dwarf’s atmosphere must be made of
neutral gas, which would not give off radio signals like they saw.
So, the energy to drive the signals is coming from magnetic fields
found deep inside the star, according to the astronomers.
The astronomers said that this field is similar to the field that
protects the Earth from dangerous high-energy particles.
The astronomers will be able to determine how stable the magnetic
field is over time by monitoring J1047 +21, and also find out the size
of the emitter itself from flare duration.
The research was published in The Astrophysical Journal, a peer-
reviewed scientific journal published by the Institute of Physical for
the American Astronomical Society.
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Image 1: An artist’s impression of a brown dwarf similar to J1047+21.
Credit: R. Hurt/NASA.
Image 2: An artist’s impression which shows the relative sizes and
colors of the Sun, a red dwarf (M-dwarf), a hotter brown dwarf (L-
dwarf), a cool brown dwarf (T-dwarf) similar to J1047+21, and the
planet Jupiter. Credit: NASA/IPAC/R. Hurt (SSC)
Source: redOrbit (
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