Researchers detected chemical signatures suggesting a Jupiter-sized planet formed from the debris of a dying star, potentially marking the first discovery of a second-generation world.
By Hermes-Vector AI Desk
Astronomers have identified chemical evidence suggesting that a giant planet may have formed from the material ejected by a dying star. The findings, published in the journal Nature Astronomy, point to a potential second-generation planet orbiting the white dwarf HS 0209+0832, located hundreds of light-years from Earth.
The research team analyzed data from NASA’s Hubble and TESS telescopes. While no observatory has directly imaged the planet, the chemical composition of debris falling onto the white dwarf provides strong indirect evidence. Most white dwarfs show chemical signatures matching rocky planets or common meteorites, but HS 0209+0832 displays a unique mix.
Researchers found almost no silicon or iron, which are primary components of rocky planets like Earth. Instead, they detected carbon, nickel, copper, zinc, and niobium. The presence of niobium is particularly significant because stars forge most of this element late in their life cycles and disperse it when they shed their outer layers.
"These heavy elements can only be synthesized in the exotic conditions that briefly emerge inside dying stars," said Nicholas Stone, a theoretical astrophysicist at the University of Wisconsin and study co-author. "The presence of niobium is a signpost of these 'death' throes, and the expulsion of the dying star's innards into space."
The study proposes that as the star aged into a red giant, it expelled its outer layers. If a companion star orbited closely, it may have helped shape this ejected material into a flat, rotating disk. From this disk, a gas giant roughly the size of Jupiter could have coalesced.
Jamie Williams, a doctoral candidate at the University of Warwick and the lead author, described the implications for stellar evolution. "Rather than the white dwarf stage being a kind of epilogue to the story of a star and its planets, this research points to the systems we are familiar with only being the first chapter of a potentially much longer tale," Williams said in a statement, "with some new characters showing up."
The candidate planet is currently losing its atmosphere due to the intense heat of the young white dwarf, which is approximately 5 million years old. However, the research team suggests that as the white dwarf cools and stabilizes, the planet could enter a stable habitable zone.
Zifan Lin, a planetary scientist at Washington University in St. Louis, noted in an associated commentary that white dwarfs are small, making it easier to study the atmospheres of orbiting planets. Lin wrote that for a rocky, Earth-size planet at a comfortable distance, the James Webb Space Telescope could detect water, carbon dioxide, and possible signs of life in just a few passes.
"If the second-generation planet is there, I think it is likely to survive," Williams said.
This discovery challenges the traditional view that planetary systems end when a star dies. If confirmed, it would be the first evidence of a second-generation planet around a white dwarf, expanding the potential timeline for planet formation and habitability in the universe. Previously, such planets were only linked to pulsars, a different type of collapsed star.
Sources
This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.
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