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JWST discovered rogue worlds that blur the road between stars and planets

August 28, 2024
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JWST discovered rogue worlds that blur the road between stars and planets
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A mosaic of photographs showcases the star-forming cluster NGC 1333

ESA/Webb, NASA & CSA, A. Scholz

Astronomers have discovered six new worlds that appear to be planets, however fashioned like stars. These so-called rogue worlds are between 5 and 15 occasions the mass of Jupiter, and considered one of them might even host the beginnings of a miniature photo voltaic system.

Ray Jayawardhana at Johns Hopkins College in Maryland and his colleagues discovered these unusual worlds within the NGC 1333 star cluster utilizing the James Webb Area Telescope. Regardless of being planet-sized, none of them orbits a star, indicating that they in all probability fashioned from the collapse of clouds of mud and fuel, the identical approach that stars like our solar are born. Objects like these that kind like stars however aren’t large sufficient to maintain the nuclear fusion of hydrogen are referred to as brown dwarfs or failed stars.

“In some methods, what’s most placing is what we didn’t discover,” says Jayawardhana. “We didn’t discover something under 5 Jupiter plenty, even if we had the sensitivity to take action.” That will point out that brown dwarfs can not kind at smaller plenty, which means these are the very smallest objects that kind like stars.

From their observations, the researchers decided that planetary mass brown dwarfs make up about 10 per cent of the objects in NGC 1333. That’s way over anticipated based mostly on fashions of star formation, so there could also be further processes, reminiscent of turbulence, that drive the formation of those rogue worlds.

In some methods, what’s most placing is what we didn’t discover

One of many brown dwarfs is especially uncommon – it has a hoop of mud round it identical to the one which fashioned the planets in our photo voltaic system. At about 5 Jupiter plenty, it’s the smallest world ever noticed with such a hoop, and it might mark the beginnings of an odd, scaled-down planetary system round a failed star.

“From a miniature world round one these objects, you’ll see the [brown dwarf] glowing primarily within the infrared – it could be a really reddish glow – and over lots of of hundreds of thousands of years it could be fading into obscurity,” says Jayawardhana. Because the brown dwarf fades, any planets which will kind round it can go right into a deep freeze and the entire system will go darkish, so these aren’t promising worlds to seek for life.

Journal reference: The Astronomical Journal, in press

Article amended on 27 August 2024

We clarified the kind of brown dwarfs that account for 10 per cent of objects within the cluster

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