Looks like astronomers may
have new hunting grounds to search for exoplanets , and it’s close in
fact it’s just in our local interstellar neighborhood. A new-found star
system at only 6.5 light years away now ranks as the third nearest to our solar
system and the closest to be discovered since 1917.
The new pair of stars are both
classified as brown dwarfs– cool, dim objects that actually resemble planets
more than stars.
While they do give off heat
and have chemical properties like ordinary stars like our Sun, these weird
objects are often referred to as ‘failed stars’ since they don’t quite
have enough mass that would allow them to be crushed by gravity so that
thermonuclear reactions can ignite the hydrogen in their cores.
The strange star system,
dubbed unromantically WISE J104915.57-531906, was stumbled upon by Kevin
Luhman, an astronomer at Penn State University while studying a map of the
entire sky stitched together from 13 months of observations obtained by NASA’s
Wide-field Infrared Survey Explorer (WISE) satellite. What clued him in was
that one particular star point appeared to have a rapid motion visible through time-lapse
images.
Luhman decided to
extrapolate the star’s movement back in time and found that it was indeed
captured but not identified by other surveys as far back as 1978.
“It was a lot of detective
work,” Luhman said in a press statement. “There are billions of infrared points
of light across the sky, and the mystery is which one- if any of them- could be
a star that is very close to our solar system.”
While astronomical distances are vast, this star system is really quite nearby when it comes to our stellar surroundings , as Luhman points out in a press statement.
While astronomical distances are vast, this star system is really quite nearby when it comes to our stellar surroundings , as Luhman points out in a press statement.
“The distance to this brown dwarf pair is 6.5 light years- so
close that Earth’s television transmissions from 2006 are now arriving there,”
Luhman said.
Comparatively the
second-closest star, Barnard’s star, is 6.0 light years from the Sun while our
nearest neighboring star system consists of Alpha Centauri at 4.4 light years,
and its fainter companion 4.2 light year distant Proxima Centauri.
The proximity of this stellar
pair, he says, may even make them favorable for us to send star-ships there one
day.
“…in the distant future it
might be one of the first destinations for manned expeditions outside our solar
system.”
But for now the powerful eyes
of ground based telescopes like the Gemini in Hawaii and Chile, and the future
James Webb Space Telescope will search for any circling planets around these
brown dwarfs.
The star system discovery will
be published in a paper for Astrophysical Journal Letters.
Source: National Geographic
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