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Astronomers have, for the first time, captured detailed images of planetary systems during their “teenage” years – a crucial and previously mysterious stage of development. An international team, including researchers from the University of La Laguna (ULL) and the Institute of Astrophysics of the Canary Islands (IAC), made the breakthrough using the Atacama Large Millimeter/submillimeter Array (ALMA).
The findings, published as a series of ten articles in Astronomy and Astrophysics, offer unprecedented insight into the debris disks that remain after planets form. These disks are considered the cosmic equivalent of a planetary system’s adolescence – more evolved than the disks where planets initially coalesce, but not yet fully mature.
The research, known as the ALMA survey to Resolve exoKuiper belt Substructures (ARKS), provides the clearest images to date of 24 such debris disks. This level of detail is crucial for understanding how planets form and organize themselves into families, much like those found in our own Solar System.
“We are observing a great diversity: not just simple rings, but belts with multiple rings, halos and strong asymmetries, which reveals a dynamic and complex chapter in planetary history,” said Sebastián Marino, leader of the ARKS program and associate professor at University of Exeter (UK).
Carlos del Burgo, a researcher at ULL and IAC and a member of the ARKS project, highlighted ALMA’s capabilities. “ALMA’s potential to reveal structures in disks is remarkable,” he said. “The increasingly sharp observations can be combined with radial velocity and light curves to improve the characterization of these emerging worlds.”
Until now, astronomers have primarily observed the “infancy” of planets. According to Meredith Hughes, associate professor of astronomy at Wesleyan University (USA) and co-leader of the study, the adolescent stage was “a missing link.” This project offers a new perspective for interpreting features like craters on the Moon, the dynamics of the Kuiper Belt, and the growth of planets both large and small.
The team overcame significant challenges to image these faint disks, which are often hundreds or even thousands of times dimmer than the bright, gas-rich disks where planets are born. The ability to observe these complex structures represents a major step forward in exoplanetary science.
The study revealed that a third of the observed disks exhibit clear substructures – multiple rings or distinct gaps – potentially formed during earlier stages of planetary formation or sculpted by planets over extended periods. Some disks retain intricate structures, while others have smoothed out into broad belts, mirroring the expected evolution of our own Solar System.
Many disks also show evidence of both calm and chaotic zones, with vertically “flared” regions similar to the mix of objects found in the Solar System’s Kuiper Belt and those scattered by Neptune’s past migration. Researchers also found that several disks retain gas for longer than expected, and in some systems, this residual gas may influence the chemical composition of growing planets or even push dust into expansive halos.
The findings suggest that this adolescent phase is a period of transition and upheaval. The ARKS project involved approximately 60 scientists from around the world, led by the University of Exeter, Trinity College Dublin, and Wesleyan University, with contributions from ULL and IAC. The research provides a valuable new lens for understanding the formation of planetary systems and the conditions that lead to habitable worlds.
The counterpart to this evolutionary stage in our Solar System is the Kuiper Belt, a ring of icy debris beyond Neptune that holds a record of massive collisions and planetary migrations that occurred billions of years ago. This new study of 24 exoplanetary debris belts helps scientists better understand what the Solar System experienced as the Moon formed and planets settled into their current orbits.
