The nearby star Fomalhaut sports a previously unseen asteroid belt tilted at a jaunty angle.
The new JWST images add to the growing evidence that Dagon is actually a cloud of dust. A collision among planets probably explains the dusty feature, says András Gáspár, an astronomer at the University of Arizona in Tucson. “It is fading, and it is expanding in size,” he says, as it follows a trajectory consistent with dust blowing in the stellar wind from Fomalhaut. Those are all characteristics more indicative of dust clouds than planets.
Indirect evidence for other worlds comes from an unexpected asteroid belt, seen for the first time in the new images. The belt is tilted at a jaunty 23 degrees from everything else seen in orbit around the star. MacGregor agrees. “If you see a disk that’s like this, that has an [elongated] outer ring and a bunch of dust that’s getting dragged in, there are probably planets there,” she says. “I think the easiest explanation [for the tilted belt] is there’s a planet in there, and the planet is on an orbit that is not aligned with the disk.” The misaligned planet, in turn, is dragging the asteroid belt off-kilter with respect to the plane of the solar system, she says.
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