'Rogue' extrasolar planetary-mass object detected

'Rogue' extrasolar planetary-mass object detected

'Rogue' extrasolar planetary-mass object detected

Its young age meant that it was in fact so much less massive that it could be a free-floating planet - only 12.7 times more massive than Jupiter, with a radius 1.22 times that of Jupiter. They are originally formed inside a star system but somehow escaped.

It's very large, and has an extremely strong magnetic field, and it's a "rogue", not attached to any other object.

Artist's conception of SIMP J01365663 0933473, an object with 12.7 times the mass of Jupiter, but a magnetic field 200 times more powerful than Jupiter's.

"This object is right at the boundary between a planet and a brown dwarf, or "failed star", and is giving us some surprises", Dr Melodie Kao and astronomer at Arizona State University told The Independent. But since then, as our technology progressed, astronomers found that these stars also exhibit signs of magnetic activity, including the formation of powerful auroras - which on Earth are created by solar wind particles interacting with the planet's magnetic field. How auroras are caused in brown dwarfs is still unclear, notes the report.

On Earth, auroras are generated by interactions between its magnetic field and solar winds. This finding is the first radio telescope finding of an object the mass of a planet found outside the Solar System. The latest data reveals it's younger than first thought at a relatively youthful 200 million years old, and its mass is smaller, so it could be classified as a planet. Since the mass of a Brown dwarf is hard to accurately calculate, at the time, the object found was thought to be an old, massive brown dwarf.

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The newly discovered planet was originally detected in 2016 and was considered to be a brown dwarf.

However, recent VLA observations have uncovered that SIMP J01365663+0933473 is too lightweight to be a brown dwarf. The temperature on that planet is about 825 degrees Celsius, which makes it a lot cooler than out Sun.

Zeroing in on this new find could lead to new techniques being developed to help search for alien worlds. One rule of thumb in drawing the distinction is the mass below which fusion of deuterium is not possible - about 13 Jupiter masses. "We think these mechanisms can work not only in brown dwarfs, but also in both gas giant and terrestrial planets", Kao said.

The team believe that they have detected radio emissions from these auroras - which presents a challenge to how we understand the mechanisms for auroras in both brown dwarfs and exoplanets.

"This particular object is exciting because studying its magnetic dynamo mechanisms can give us new insights on how the same type of mechanisms can operate in extrasolar planets". It is a component of the National Radio Astronomy Observatory (NRAO).

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