At 200 million years old and approximately 20 light-years from Earth, SIMP0136 has a surface temperature of about 1,500 degrees Fahrenheit (825 degrees Celsius). A light year is equal to about 6 trillion miles.
Brown dwarfs have long baffled experts because they're too big to be considered planets but are not big enough to be stars. The team's analysis showed the planet's magnetic field is around 200 times stronger than Jupiter's, and this could help explain why it also has a strong aurora.
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The new discovery, made with the National Science Foundation's Karl G. Jansky Very Large Array telescopes in New Mexico, marks the first radio observations of a planetary-mass object beyond our solar system. The first ever sighting of a Brown Dwarf happened as late as 1995.
Astronomers say there have been only a few rogue planets discovered to date. Its age meant that instead of a "failed star", they had found a free-floating planet.
Auroras on Earth are created when charged particles from the Sun interact with Earth's magnetic field. They have detected a possible "rogue" planetary-mass object. New analysis has proved that it is in fact a proper planet with an extraordinarily powerful magnetic field.
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Though it was first detected in 2016, scientists initially identified it as one of five recently discovered brown dwarfs. Scientists theorise that one possibility is having a planet or moon interact with the dwarf's magnetic field. "We think these mechanisms can work not only in brown dwarfs, but also in both gas giant and terrestrial planets".
"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 - planets beyond our solar system".
Caltech's Gregg Hallinan said that researching SIMP "presents huge challenges to our understanding of the dynamo mechanism that produces the magnetic fields in brown dwarfs and exoplanets and helps drive the auroras we see".
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The new discovery can make boffins believe that they may have a novel way of detecting and finding exoplanets, including rogue ones that are hard to identify since they are not orbiting a parent star like the planets do in our solar system.