A dead star has two rings of planetary debris; one may be hiding a Pluto-sized survivor

A star can run out of fuel, swell into a giant and shed its outer layers, leaving behind a dense stellar remnant. Planets close to it may be engulfed or destroyed in the process. But what happens to the rocky bodies that escape?

Astronomers studying a white dwarf about 1,600 light years from Earth have found an unusual clue. The dead star, identified asWD J1328–1450, is surrounded by not one but two separate rings of gaseous planetary debris. The rings are divided by a gap and appear to have remained stable for more than two years.

Researchers propose that two planetary bodies may be responsible for maintaining this arrangement. One could be comparable to a small asteroid, while the other may be as large as Pluto, with some estimates allowing for a body approaching the size of the Moon.


The objects themselves have not been directly observed. Instead, their possible presence has been inferred from the unusual behaviour of gas around the white dwarf. The findings were published in the journal Nature Astronomy on October 26, 2026.

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A dead star with an unusual signature

WD J1328–1450 is a white dwarf, the dense remnant left behind when a star similar to the Sun exhausts its nuclear fuel and sheds its outer layers.

As a Sun like star approaches the end of its life, it expands into a red giant. This transformation can engulf nearby planets and disrupt the wider planetary system. Rocky material that survives may eventually break apart, leaving dust and gas orbiting the stellar remnant.

Astronomers have identified gaseous debris discs around other white dwarfs. But the newly studied system showed a structure unlike the examples known so far.

The research team used the X-shooter instrument on the European Southern Observatory's Very Large Telescope in Chile to examine the light coming from the system. Gas moving around a star produces characteristic emission lines. Because one side of a rotating disc moves towards Earth while the other moves away, the resulting spectral signal can show two peaks.

In the 21 previously known gaseous debris-disc systems, researchers had found this familiar double-peaked pattern. White Dwarf named WD J1328–1450 produced four peaks.

Four peaks revealed two separate rings

The researchers found that the unusual spectral profile could be explained by two distinct gaseous rings rotating around the white dwarf at different speeds.

The inner ring extends from about 0.14 to 0.34 times the Sun's radius from the star. The outer ring stretches from approximately 0.54 to 1.93 times the Sun's radius. A gap separates the two structures.

Observations taken between 2021 and 2023 showed that the arrangement remained stable over more than two years. This persistence is important because gas around a white dwarf can spread out over time. The researchers therefore needed an explanation for how two separate rings could continue to exist without quickly merging into one structure.

The chemical composition offered another clue. The observations identified calcium, oxygen, magnesium and iron in the surrounding material. These elements are also found in rocky planetary material in our Solar System.

The inner ring appears rich in magnesium, while the outer ring contains considerably less of it. This difference could point to material from bodies with different compositions. An alternative possibility is that the two rings contain material from different layers, such as the crust and core, of a single differentiated body.

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Could two planetary bodies be keeping the rings in place?

The team's leading explanation involves two surviving planetary bodies, known as planetesimals, orbiting within the debris.

As these bodies move through the surrounding dust, interactions could release gas and help maintain the two rings. The researchers argue that two separate bodies are the most likely way to explain the system's unusual structure.

Their sizes, however, are estimates rather than direct measurements. The inner object may be asteroid-sized, while the outer one could be much larger, potentially reaching Pluto-like dimensions. Depending on its location and the assumptions used, the outer body's estimated upper size could approach that of the Moon.

The bodies are not visible in the observations. Their possible existence is inferred from the distribution, composition and movement of the gas.

This distinction matters because the discovery does not establish that two intact planets have definitely survived. It presents evidence for a complex debris arrangement and a proposed explanation for how it is sustained.

A possible glimpse of the Solar System's distant future

The finding also offers a way to study what may happen to planetary systems after their central stars evolve.

The Sun is expected to expand into a red giant billions of years from now before shedding its outer layers and becoming a white dwarf. This process is likely to transform the Solar System dramatically and may destroy Earth.

WD J1328–1450 provides an example of what the material left around a stellar remnant can look like. Its two rings suggest that the remains of a planetary system may be more complicated than a single belt of dust and gas.

The discovery also raises questions about how long surviving planetary bodies can continue to shape debris around dead stars, and whether similar structures exist elsewhere.

For now, astronomers have not seen the possible survivors themselves. They have found something else: a distinctive pattern in the light of a dead star that may reveal the last pieces of a planetary system still moving around it.