The cosmic object’s magnetic field traps electrons in a bubble around it, like fireflies in a jar.
For the first time, astronomers have spotted a band of radiation surrounding an object outside our solar system.. As the electrons move, they radiate radio waves. Such radiation belts give insight into the shape of a cosmic object’s magnetic field, its interior structure and maybe even whether it has moons., rings of electrons captured from the sun . Jupiter’s radiation belts get most of their particles from the volcanic moon Io.
The team spotted a belt that looks a lot like those of Jupiter’s but 10 million times as bright, says Kao, of the University of California, Santa Cruz. The object is nearly 80 times as massive as Jupiter, making it either a diminutive star or a massive brown dwarf, a dim starlike body not hefty enough to sustain hydrogen fusion.
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