Debris double disk discovered around dead star, reveals future of the Sun

An international team led by Nicola Gentile Fusillo from the University of Trieste has discovered a double debris disk of planetary remnants around a dead star, the white dwarf J1328−1450. The structure, observed using the ESO's Very Large Telescope in Chile, is shaped by two planetary bodies that survived the violent death of their parent star.

The disk differs from those observed so far because it features two concentric rings of extraordinarily stable debris, separated by an empty gap. According to the researchers, this configuration is maintained by two planetary bodies in distinct orbits: one in the inner ring, as large as an asteroid, and one in the outer ring, as large as Pluto or the Moon.

The study, published in Nature Astronomy, represents the first example of such a complex system around a dead star and foreshadows the fate of our Solar System when the Sun, billions of years from now, exhausts its fuel.

Stars like the Sun, when they enter the final stages of their existence, expand and disperse their outer layers, swallowing and destroying the nearest planets. This violent process leaves a dead star called a white dwarf at the center. The more distant rocky bodies that manage to survive can fragment, creating a debris disk around the extinguished star.

For decades, astronomers have theorized that some planets could survive this transformation, but direct observations of complex systems were lacking. Research on debris disks around white dwarfs began to understand the ultimate fate of planetary systems and to test theories on stellar evolution.

The discovery of the double disk around J1328−1450 represents a breakthrough because it shows for the first time how planetary bodies can not only survive, but also actively shape the surrounding environment after the star's death. This system serves as a model for predicting what will happen to our Solar System in about 5 billion years, when the Sun becomes a white dwarf.