Astronomers have captured something extraordinary: the first-ever direct photo of a baby planet growing inside a dusty ring around a young star.
Using cutting-edge adaptive optics, the team detected the glowing hydrogen gas streaming onto the infant world, essentially catching it mid-birth.
First Detection of a Growing Exoplanet
Astronomers have, for the first time, identified a young planet still in the process of growing beyond our solar system. The infant world sits within a cleared-out gap inside a multi-ringed disk of dust and gas that surrounds its host star.
The discovery was made by a team led by University of Arizona astronomer Laird Close and Richelle van Capelleveen, a graduate student at Leiden Observatory in the Netherlands. To spot this elusive planet, the researchers used some of the most advanced adaptive optics instruments in the world, including the University of Arizona’s MagAO-X system at the Magellan Telescope in Chile, the Large Binocular Telescope in Arizona, and the European Southern Observatory’s Very Large Telescope in Chile. Their findings appear in The Astrophysical Journal Letters.
Astronomers have long studied dozens of these planet-forming disks around young stars. Many show ring-like gaps that suggest hidden worlds may be sweeping through them, clearing paths much like a snowplow pushes aside snow. However, only about three young protoplanets had ever been directly observed before, and all were found close to their stars, in the space between the star itself and the edge of its surrounding disk. Until this breakthrough, no protoplanets had been confirmed inside the dark, well-defined gaps that have intrigued scientists for years.
A Longstanding Scientific Mystery Resolved
“Dozens of theory papers have been written about these observed disk gaps being caused by protoplanets, but no one’s ever found a definitive one until today,” said Close, professor of astronomy at the University of Arizona. He calls the discovery a “big deal,” because the absence of planet discoveries in places where they should be has prompted many in the scientific community to invoke alternative explanations for the ring-and-gap pattern found in many protoplanetary disks.
“It’s been a point of tension, actually, in the literature and in astronomy in general, that we have these really dark gaps, but we cannot detect the faint exoplanets in them,” he said. “Many have doubted that protoplanets can make these gaps, but now we know that in fact, they can.”
Lessons From Our Own Solar System’s Birth
4.5 billion years ago, our solar system began as just such a disk. As dust coalesced into clumps, sucking up gas around them, the first protoplanets began to form. How exactly this process unfolded, however, is still largely a mystery. To find answers, astronomers have looked to other planetary systems that are still in their infancy, known as planet-forming disks, or protoplanetary disks.
Close’s team took advantage of an adaptive optics system, one of the most formidable of its kind in the world, developed and built by Close, Jared Males, and their students. Males is an associate astronomer at Steward Observatory and the principal investigator of MagAO-X. MagAO-X, which stands for “Magellan Adaptive Optics System eXtreme,” dramatically improves the sharpness and resolution of telescope images by compensating for atmospheric turbulence, the phenomenon that causes stars to flicker and blur, and is dreaded by astronomers.
Probing Hidden Planets With Hydrogen Light
Suspecting there should be invisible planets hiding in the gaps of protoplanetary disks, Close’s team surveyed all the disks with gaps and probed them for a specific emission of visible light known as hydrogen alpha or H-alpha.
“As planets form and grow, they suck in hydrogen gas from their surroundings, and as that gas crashes down on them like a giant waterfall coming from outer space and hits the surface, it creates extremely hot plasma, which in turn, emits this particular H-alpha light signature,” Close explained. “MagAO-X is specially designed to look for hydrogen gas falling onto young protoplanets, and that’s how we can detect them.”
Discovery in the WISPIT-2 System
The team used the 6.5-meter Magellan Telescope and MagAO-X to probe WISPIT-2, a disk van Capelleveen recently discovered using the VLT. Viewed in H-alpha light, Close’s group struck gold. A dot of light appeared inside the gap between two rings of the protoplanetary disk around the star. In addition, the team observed a second candidate planet inside the “cavity” between the star and the inner edge of the dust and gas disk.
“Once we turned on the adaptive optics system, the planet jumped right out at us,” said Close, who called this one of the more important discoveries in his career. “After combining two hours’ worth of images, it just popped out.”
Early Echoes of Jupiter and Saturn
According to Close, the planet, designated WISPIT 2b, is a very rare example of a protoplanet in the process of accreting material onto itself. Its host star, WISPIT 2 is similar to the sun and about the same mass. The inner planet candidate, dubbed CC1, contains about nine Jupiter masses, whereas the outer planet, WISPIT 2b, weighs in at about five Jupiter masses. These masses were inferred, in part, from the thermal infrared light observed by the University of Arizona’s 8.4-meter Large Binocular Telescope on Mount Graham in Southeastern Arizona with the help of U of A astronomy graduate student Gabriel Weible.
“It’s a bit like what our own Jupiter and Saturn would have looked like when they were 5,000 times younger than they are now,” Weible said. “The planets in the WISPIT-2 system appear to be about 10 times more massive than our own gas giants and more spread out. But the overall appearance is likely not so different from what a nearby ‘alien astronomer’ could have seen in a ‘baby picture’ of our solar system taken 4.5 billion years ago.”
Mapping Orbits and Ringed Structures
“Our MagAO-X adaptive optics system is optimized like no other to work well at the H-alpha wavelength, so you can separate the bright starlight from the faint protoplanet,” Close said. “Around WISPIT 2 you likely have two planets and four rings and four gaps. It’s an amazing system.”
CC1 might orbit at about 14-15 astronomical units – with one AU equaling the average distance between the sun and Earth, which would place it halfway between Saturn and Uranus, if it was part of our solar system, according to Close. WISPIT-2b, the planet carving out the gap, is farther out at about 56 AU, which in our own solar system, would put it well past the orbit of Neptune, around the outer edge of the Kuiper Belt.
Confirming the Discovery in Infrared
A second paper published in parallel and led by van Capelleveen and the University of Galway details the detection of the planet in the infrared light spectrum and the discovery of the multi-ringed system with the 8-meter VLT telescope’s SPHERE adaptive optics system.
“To see planets in the fleeting time of their youth, astronomers have to find young disk systems, which are rare,” van Capelleveen said, “because that’s the one time that they really are brighter and so detectable. If the WISPIT-2 system was the age of our solar system and we used the same technology to look at it, we’d see nothing. Everything would be too cold and too dark.”
Explore Further: For the First Time, Astronomers See a Baby Planet Still Glowing From Birth
References:
“Wide Separation Planets in Time (WISPIT): Discovery of a Gap Hα Protoplanet WISPIT 2b with MagAO-X” by Laird M. Close, Richelle F. van Capelleveen, Gabriel Weible, Kevin Wagner, Sebastiaan Y. Haffert, Jared R. Males, Ilya Ilyin, Matthew A. Kenworthy, Jialin Li, Joseph D. Long, Steve Ertel, Christian Ginski, Alycia J. Weinberger, Kate Follette, Joshua Liberman, Katie Twitchell, Parker Johnson, Jay Kueny, Daniel Apai, Rene Doyon, Warren Foster, Victor Gasho, Kyle Van Gorkom, Olivier Guyon, Maggie Y. Kautz, Avalon McLeod, Eden McEwen, Logan Pearce, Lauren Schatz, Alexander D. Hedglen, Ya-Lin Wu, Jacob Isbell, Jenny Power, Jared Carlson, Emmeline Close, Elena Tonucci and Matthijs Mars, 26 August 2025, The Astrophysical Journal Letters.
DOI: 10.3847/2041-8213/adf7a5
“WIde Separation Planets In Time (WISPIT): A Gap-clearing Planet in a Multi-ringed Disk around the Young Solar-type Star WISPIT 2” by Richelle F. van Capelleveen, Christian Ginski, Matthew A. Kenworthy, Jake Byrne, Chloe Lawlor, Dan McLachlan, Eric E. Mamajek, Tomas Stolker, Myriam Benisty, Alexander J. Bohn, Laird M. Close, Carsten Dominik, Sebastiaan Haffert, Rico Landman, Jie Ma, Ignas Snellen, Ryo Tazaki, Nienke van der Marel, Lukas Welzel and Yapeng Zhang, 26 August 2025, The Astrophysical Journal Letters.
DOI: 10.3847/2041-8213/adf721
This research was supported in part by a grant from the NASA eXoplanet Research Program. MagAO-X was developed in part by a grant from the U.S. National Science Foundation and by the generous support of the Heising-Simons Foundation.
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