Astronomers have found a pair of debris rings circling a burnt-out star, a structure unlike any previously seen around a stellar remnant, according to WebWire. The discovery, reported in the journal Nature Astronomy, offers a possible preview of how our own Solar System will end. The work was carried out with the X-Shooter instrument on the European Southern Observatory's Very Large Telescope in Chile's Atacama Desert.
The central object is the white dwarf J1328−1450, the dense core left behind after a star much like the Sun exhausted its fuel and cast off its outer layers. The study was led by Nicola Gentile Fusillo of the University of Trieste in Italy, who is also affiliated with the INAF Astronomical Observatory of Trieste.
Why it matters
When Sun-like stars reach the end of their lives, they swell and blow away their outer envelopes, a process that swallows and destroys planets orbiting close by. Rocky bodies farther out can survive, and some of them later shatter into rubble that settles into a disc around the dead star. Such discs have been catalogued before, but always as a single flat ring.
The J1328−1450 system breaks that pattern. Instead of one ring, it shows two concentric rings of vaporised planetary material with a clear gap between them. According to WebWire, the team believes two surviving planetary bodies, on separate orbits, are keeping the structure stable.
"We have known for some time that planets may survive beyond the transformation of their central star, but this is the first example of a complex system with a double debris disc and potentially two surviving planetesimals," Gentile Fusillo said in comments carried in the reporting.
A gap held open by survivors
The inner ring is thought to be shepherded by a body a few kilometres across, comparable to a typical asteroid. The outer ring's companion could be as large as Pluto, or possibly as large as the Moon, according to the team's estimates.
Co-author Felipe Lagos-Vilches, an astronomer at the University of Warwick in the UK and at the Universidad Técnica Federico Santa María in Chile, described the arrangement as unusually steady. "The structure we see in this system is particularly intriguing because the two gaseous rings are remarkably stable and remain separated by a gap," he said.
Gentile Fusillo added that the system gives a rare look at the turbulent process by which a planetary system meets its end, and suggests that dead stars can host disc structures more complicated than researchers had assumed.
Two recipes in one disc
The observations also captured the chemical fingerprint of the debris. Calcium, oxygen, magnesium and iron are all present, a mix that resembles the rocky material found in our own Solar System. But the two rings are not identical: the inner one is rich in magnesium gas, while the outer one has largely lost it.
That split points to the planetesimals feeding the rings having come from two planets with different compositions, the team suggests. Another possibility is that the material came from different layers of a single body, such as its crust and its core.
The double-ring reading rests on a departure from the usual observational signature. Every debris disc known around a white dwarf had previously been identified the same way, as a single flat rotating disc. The new data from the Very Large Telescope show J1328−1450 producing a distinct pattern instead, which the researchers interpret as two discs.
What comes next
The findings appear in Nature Astronomy under DOI 10.1038/s41550-026-03004-3. The author list also includes Boris T. Gänsicke of the University of Warwick, Christopher J. Manser of Imperial College London and Detlev Koester of the University of Kiel in Germany. Further study of this system and searches for similar double-ring candidates should show whether J1328−1450 is an outlier or the first of a class.
