Astronomers believe they have discovered two of the most distant objects ever found in our solar system.
One of the objects, they say, could be a 'Super Earth' located six times farther away than Pluto.
Using
the Alma telescope, researchers from Sweden and Mexico noticed
mysterious objects crossing their field of view as part of separate
studies.
It's
difficult to tell exactly how far away these objects are, but their
speed and brightness suggest that they are unlikely to be stars.
Astronomers believe they have
discovered two of the most distant objects ever found in our solar
system. One of the objects, they say, could be a 'Super Earth' located
six times farther away than Pluto. Pictured is an artist's impression of
an exoplanet
The
studies have already drawn scepticism from other astronomers who say
they are likely to be something known as super-cool brown dwarfs.
Brown dwarfs are cosmic bodies that never burn fusion at their core. Scientists sometimes refer to them as 'failed stars.'
While the latest studies do not rule out this possibility, they add that both objects may be a good candidate for 'Planet X'.
This
is a theoretical world that, if it existed, could explain some anomalies
in the orbits of planets such as Neptune and Uranus.
Wouter Vlemmings, an astronomer at Chalmers University of Technology in Sweden is co-author on both studies.
The studies were looking at a distant
star called W Aquilae (or W Aql), and the nearby star system Alpha
Centauri. Shown here is a picture of Alpha Centauri captured by Wise
The studies were looking at a distant star called W Aquilae (or W Aql), and the nearby star Alpha Centauri.
In the W Aql study, the astronomers saw a strange object in March 2014 and then in April.
They claim it is likely just one object seen twice, but seen on the fringes of our solar system, according to a report in Gizmodo.
'Until the nature of the source becomes clear, we have named it Gna,' write the authors in the study.
'Unless
there are yet unknown, but significant, issues with ALMA observations,
we have detected a previously unknown objects [sic] in our solar system.
Estimates
place the object, dubbed Gna, to be between 12 to 25 AU. One AU
describes the average distance of Earth to the Sun), or about 93 million
miles.
They estimate its size is about 220 to 880 km (136 to 545 miles) if it's gravitationally bound.
If it's unbound it could 'much larger, planet-sized object' located within 4,000 AU, or by some estimates 61,900 AU away.
The second study found an unnamed object that appears near the star system Alpha Centauri.
The
researchers say it could be one of three things; a small Trans
Neptunian Object at a distance of 100 AU, a Super Earth located 300 AU
away, or super-cool brown dwarf.
Research groups from Sweden and Mexico have now submitted pre-prints of two research papers to arXiv describing their find.
'Simple
arguments convince us that this object cannot be an ordinary star,' the
authors of one paper, uploaded on December 8, 2015, to arXiv, conclude.
'We
argue that the object is most likely part of the solar system, in
prograde motion, albeit at a distance too far to be detectable at other
wavelengths.'
The studies were looking at a distant
star called W Aquilae (or W Aql), and the nearby star Alpha Centauri. In
the W Aql study, the astronomers saw a strange object in March 2014 and
then in April. Pictured are signals from the two Alma detections on
March 20 and April 14, 2014
Mike Brown, a planetary scientist at the California Institute of Technology isn't so sure.
'Fun
fact: if it is true that Alma accidentally discovered a massive outer
solar system object in its tiny tiny tiny field of view that would
suggest that there are something like 200,000 Earth sized planets in the
outer solar system,' he tweeted.
'Which,
um, no. Even better: I just realized that this many Earth-sized planets
existing would destabilize the entire solar system and we would all
die.'
Other
scientists point out that studies with Nasa's Wide-field Infrared
Survey Explorer which has searched the outer solar system for large
planets and come back empty handed.
Jonathan
McDowell, an astronomer with the Harvard-Smithsonian Center for
Astrophysics, told Gizmodo it was a 'considerable stretch' to claim a
outer solar system object had been found based on the information in the
reports.
Both studies have been submitted to the prestigious journal Astronomy & Astrophysics, but neither has been peer-reviewed.
Using the Alma telescope (pictured),
researchers from Sweden and Mexico noticed mysterious objects crossing
their field of view as part of separate studies
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