Around a dead star called J1328-1450, something unfamiliar has been found: two separate rings of gas, set one within the other, turning in a quiet orbit. It is the kind of discovery that reminds us what becomes of worlds when their sun grows old. Our own star will one day follow the same path, shedding its outer layers and leaving a dense core behind, and in these rings astronomers may be glimpsing the remnants of bodies that once circled it before its death. Whether those remnants came from one shattered world or two is a question the chemistry of the rings may yet answer.
Two Shattered-Planet Rings Circle Dead Star J1328-1450, Hinting at What Survives a Sun's Death
Two rings, one dead star, and planets that may not be entirely gone
Mark
So what's actually new here? We already knew white dwarfs have debris around them.
Mimi
The shape. Earlier discoveries were single gaseous discs. This one has two concentric rings, one farther out than the other.
Mark
And what's holding them apart?
Mimi
The researchers' proposal is surviving planetesimals, two of them, one for each ring. The smaller might be a few kilometres across, the larger perhaps Pluto- or Moon-sized.
Luke
Worth being clear that nobody has seen those bodies. They're inferred from how the rings look and behave. It's a proposal, not a detection.
Mark
What about the chemistry?
Mimi
Magnesium emission shows up in the inner ring, but the outer ring is significantly depleted of it.
Mark
Why does that matter?
Mimi
Rocky planets can be layered, with crust, mantle and core. So the rings could be from two different bodies, or from different layers of one.
Luke
And the reporting doesn't say which is more likely. Both stay open. Also, the Pluto-or-Moon range is wide, so that size estimate is loose.
Mark
And the link to our Sun?
Mimi
The Sun should become a white dwarf in about 5 billion years, so this is a look at what might remain afterward.
Luke
Suggestive, not predictive. One star's debris doesn't tell us what our own system will leave behind.
Der Puls
- A white dwarf that should host a simple debris disc instead carries two distinct gaseous rings, breaking expectations.
- Astronomers suspect unseen fragments of planetary bodies are holding the rings in place, yet none has been directly observed.
- Magnesium glows in the inner ring but is markedly depleted in the outer, pointing to chemically different origins.
- Researchers are weighing whether two separate bodies or two layers of one body produced the debris, and the answer remains open.
Around a dead star called J1328-1450, something unfamiliar has been found: two separate rings of gas, set one within the other, turning in a quiet orbit. It is the kind of discovery that reminds us what becomes of worlds when their sun grows old. Our own star will one day follow the same path, shedding its outer layers and leaving a dense core behind, and in these rings astronomers may be glimpsing the remnants of bodies that once circled it before its death. Whether those remnants came from one shattered world or two is a question the chemistry of the rings may yet answer.
Astronomers have found a dead star wrapped in something they had never seen before. Two separate rings of gas circle the white dwarf J1328-1450, one farther out than the other. The finding was published in Nature Astronomy on October 26, 2026, and the European Southern Observatory announced it the next day.
A white dwarf is the dense core left behind when a star sheds its outer layers at the end of its life. The Sun will follow that path in roughly 5 billion years, swelling into a red giant before settling into its own quiet remnant. The rings around J1328-1450 show what such a remnant can still hold. Debris discs around white dwarfs are not new, but this one is arranged into two concentric rings, and that structure is what sets it apart.
The team used the X-shooter instrument on ESO's Very Large Telescope in Chile to study the light and motion of the gas. To explain the arrangement, they propose that small planetary bodies called planetesimals survived the star's expansion. Two such bodies, one for each ring, could account for the gap between them. The smaller might be only a few kilometres across, the larger as big as Pluto or the Moon. No such body has been directly seen.
The chemistry adds a further clue. Magnesium shows up in the inner ring but is largely missing from the outer. Planetary bodies have layers, such as crust, mantle and core, so the difference could mean two bodies that began unlike each other, or one body whose layers were scattered in different places. Either answer would reveal something about the worlds that orbited this star before it died. For now, the bodies remain inferred, and the rings' composition is what may decide between the two explanations.
Astronomers have found something around a dead star that they have not seen before: two separate rings of gas, one set farther out than the other, circling a white dwarf called J1328-1450. The finding was published in Nature Astronomy on October 26, 2026, and the European Southern Observatory announced it the following day, October 27.
A white dwarf is the dense core that remains after a star sheds its outer layers at the end of its life. The Sun is expected to follow that path. Roughly 5 billion years from now it will use up the hydrogen in its core, where fusion currently turns hydrogen into helium. It will then swell into a red giant, engulfing some planets and drastically changing conditions across the Solar System. Eventually it will cast off its outer layers and leave a white dwarf behind. That is the stage astronomers are looking at around J1328-1450.
Debris discs around white dwarfs are not new. What sets this one apart is its structure. Instead of a single gaseous disc, the material is organised into two concentric rings, with one positioned farther from the star than the other.
The team made the detection with the X-shooter instrument on ESO's Very Large Telescope in Chile. The instrument let researchers study the light from the material around the white dwarf and observe how the gas was moving.
To explain the two-ring arrangement, the researchers suggest that some planetary bodies survived the star's expansion. These would be planetesimals, smaller solid bodies that can be leftovers of a planetary system. None has been directly observed around J1328-1450. The idea is that their gravity and interactions with the surrounding dust could account for the separation between the rings. The proposal involves two such bodies, one tied to the inner ring and one to the outer. The smaller could be only a few kilometres across, while the larger could be as big as Pluto or even the Moon.
The chemistry of the rings adds another clue. They are not identical in composition: magnesium emission has been detected in the inner ring, while the outer ring appears significantly depleted of it.
That matters because planetary bodies are not uniform throughout. A differentiated rocky planet has layers, including a crust, mantle and core, each with its own makeup. The researchers therefore consider two possibilities. The rings might hold debris from two different bodies that started out chemically distinct. Or they might hold material from different layers of a single body.
Either answer would tell astronomers something about what orbited the star before it died. For now, the planetesimals remain inferred rather than seen, and the rings' composition is the main thing that could help decide between the two explanations.
Bemerkenswerte Zitate
Two surviving planetesimals, one tied to each ring, may explain the structure; the larger could be Pluto- or Moon-sized.— Researchers' proposal, as reported
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Das Original lesen bei The Times of India ↗