Astronomers have identified a young planetary system which may aid in
understanding how our own solar system formed and developed billions of
years ago.
Using the Gemini Planet Imager (GPI) at the Gemini South telescope in
Chile, the researchers identified a disc-shaped bright ring of dust
around a star only slightly more massive than the sun, located 360 light
years away in the Centaurus constellation. The disc is located between
about 37 and 55 Astronomical Units (3.4 -- 5.1 billion miles) from its
host star, which is almost the same distance as the solar system's
Kuiper Belt is from the sun. The brightness of the disc, which is due to
the starlight reflected by it, is also consistent with a wide range of
dust compositions including the silicates and ice present in the Kuiper
Belt.
The Kuiper Belt lies just beyond Neptune, and contains thousands of
small icy bodies left over from the formation of the solar system more
than four billion years ago. These objects range in size from specks of
debris dust, all the way up to moon-sized objects like Pluto -- which
used to be classified as a planet, but has now been reclassified as a
dwarf planet.
The star observed in this new study is a member of the massive 10-20
million year-old Scorpius-Centaurus OB association, a region similar to
that in which the sun was formed. The disc is not perfectly centred on
the star, which is strong indication that it was likely sculpted by one
or more unseen planets. By using models of how planets shape a debris
disc, the team found that 'eccentric' versions of the giant planets in
the outer solar system could explain the observed properties of the
ring.
"It's almost like looking at the outer solar system when it was a
toddler," said principal investigator Thayne Currie, an astronomer at
the Subaru Observatory in Hawaii.
The current theory on the formation of the solar system holds that it
originated within a giant molecular cloud of hydrogen, in which clumps
of denser material formed. One of these clumps, rotating and collapsing
under its own gravitation, formed a flattened spinning disc known as the
solar nebula. The sun formed at the hot and dense centre of this disc,
while the planets grew by accretion in the cooler outer regions. The
Kuiper Belt is believed to be made up of the remnants of this process,
so there is a possibility that once the new system develops, it may look
remarkably similar to our solar system.
"To be able to directly image planetary birth environments around
other stars at orbital distances comparable to the solar system is a
major advancement," said Dr Nikku Madhusudhan of Cambridge's Institute
of Astronomy, one of the paper's co-authors. "Our discovery of a
near-twin of the Kuiper Belt provides direct evidence that the planetary
birth environment of the solar system may not be uncommon."
This is the first discovery with the new cutting-edge Gemini
instrument. "In just one of our many 50-second exposures we could see
what previous instruments failed to see in more than 50 minutes," said
Currie.
The star, going by the designation HD 115600, was the first object
the research team looked at. "Over the next few years, I'm optimistic
that GPI will reveal many more debris discs and young planets. Who knows
what strange, new worlds we will find," Currie added
This story is taken from Science Daily
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