Dead star's double debris ring offers a preview of the Solar System's end

Overview

Updated 1 hour ago

About 73 million years ago, a star roughly half the Sun's mass ran out of fuel and collapsed into a white dwarf. What is left of its planets now circles it in two separate rings of glowing gas, with a clear gap between them.

All 21 gas-rich debris discs found around white dwarfs before this one showed a single ring. The double structure around J1328−1450 suggests two rocky bodies survived the star's death and are still feeding the rings, one of them possibly as large as Pluto.

Why it matters

The Sun will become a white dwarf too. This system shows what may remain of the inner Solar System afterward.

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Key Indicators

Concentric gas rings

Two spectroscopically distinct rings separated by a gap.

Gas-rich debris discs known before this one

Every one of them showed a single-ring signature.

Peaks in the calcium and oxygen lines

Single discs produce two peaks; this system produces four.

1.34 million km

Outer edge of the outer ring

About 3.5 times the Moon's distance from Earth.

Voices

Curated perspectives — historical figures and your fellow readers.

People Involved

Nicola Gentile Fusillo

Lead author, astronomer at the Università degli Studi di Trieste and INAF-Astronomical Observatory of Trieste

Lead author of the Nature Astronomy study

Felipe Lagos-Vilches

Co-author, astronomer at the University of Warwick and Universidad Técnica Federico Santa María

Co-author of the Nature Astronomy study

Organizations Involved

European Southern Observatory

Intergovernmental astronomy organization

Operates the Very Large Telescope, which collected the J1328−1450 spectra

Runs the Very Large Telescope in Chile's Atacama Desert, where the X-Shooter instrument recorded the double-ring signal.

Università degli Studi di Trieste

University

Home institution of the study's lead author

Italian university where lead author Nicola Gentile Fusillo is based.

University of Warwick

University

Home institution of co-author Felipe Lagos-Vilches

British university where co-author Felipe Lagos-Vilches is based.

Timeline

2021 November 2026

5 events Latest: Yesterday

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November 2026
Nature publishes a research highlight
Latest Publication

Nature's news team summarises the finding for a wider readership.
Yesterday
October 2026
ESO announces the discovery
Statement

The observatory reports two candidate surviving bodies, one possibly Pluto-sized.
October 27th, 2026
Study published in Nature Astronomy
Publication

Gentile Fusillo and colleagues describe two gas rings around the white dwarf.
October 2026
2023
Second observation confirms the pattern
Observation

Roughly two years later, the four-peak signal is unchanged.
2023
2021
First spectrum of J1328−1450
Observation

The X-Shooter instrument on the Very Large Telescope records the white dwarf's light.
2021

Scenarios

Follow-up observations pin down the two orbits

Possible Resolves by Q2 2028

Discussed by: The study authors, who say they cannot yet determine the exact orbits of the two candidate bodies

The team inferred two planetesimals from the gas behaviour but never saw them. Additional X-Shooter or higher-resolution spectroscopy could measure how the ring gas moves and fix each body's orbital path. That would turn a two-body inference into a measured architecture.

A second double-disc white dwarf turns up

Possible Resolves by End of 2029

Discussed by: Astronomers quoted in ESO and Nature coverage, who call the system the first of its kind

If two surviving rocky bodies can hold two rings apart, other white dwarfs should show the same four-peak signature. A survey reanalysis or a new X-Shooter campaign could find one. A second example would move the system from oddity to class.

A single warped disc replaces the two-body model

Unlikely Resolves by End of 2028

Discussed by: The study authors, who note that a bulging single disc could mimic the gap, though no existing model supports it

Four spectral peaks do not strictly require two rings. A disc that flares upward could shade the region where the gap appears. If a published model reproduces the signal with one disc and no second body, the surviving-planetesimal reading loses its footing.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

Through October 2026

The single-ring baseline (through 2026)

Astronomers had identified 21 debris discs around white dwarfs that contain gas. Each one produced the same two-peak signature in its spectral lines, the fingerprint of a single flat, rotating ring. That uniformity made the two-peak pattern the standard test for these systems.

Then

Any new gas disc was expected to show two peaks, and most did.

Now

J1328−1450 broke the pattern with four peaks, forcing the field to consider that dead stars can host more complex disc structures.

Why this matters now

The 21-system baseline is what makes this discovery a first: without it, a double ring would be unremarkable.

Before 2026

SDSS J1228+1040 and the two-hour signal

Around another white dwarf, SDSS J1228+1040, astronomers detected a gas signal that repeated about every two hours. They could explain it only with a dense solid body inside the disc, shedding gas as it interacted with surrounding dust.

Then

The result established that a surviving rocky body can be inferred from gas behaviour alone.

Now

That method is the one Gentile Fusillo's team applied twice over at J1328−1450.

Why this matters now

It is the precedent for claiming two unseen planetesimals without ever imaging them.