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Discovery of potential second-generation white dwarf planet

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2026-10-10 16:19 UTC → 2026-10-12 05:49 UTC · added ~~removed~~

Astronomers have identified a potential ‘second-generation’ gas giant planet orbiting the white dwarf HS 0209+0832, located approximately 270 light-years from Earth in the constellation Cetus. This candidate, referred to as a ‘phoenix planet,’ appears to have condensed from debris expelled by the star during its final evolutionary stages, rather than forming alongside the star’s initial birth. Initial analysis of data from the Hubble Space Telescope and NASA’s TESS satellite revealed unusual chemical signatures in the white dwarf's atmosphere. These signatures include high concentrations of niobium, copper, and zinc, with niobium appearing over 1,000 times more abundant than in the Sun. Subsequent research utilizing the James Webb Space Telescope (JWST) and a re-examination of data from Hubble, FUSE, and the Very Large Telescope has provided further context. This investigation resolved a 27-year mystery regarding spectral lines first captured in 1999. The findings confirm the presence of high levels of niobium, zinc, and copper, while noting a lack of iron and silicon in the star's atmosphere. In a study published in Nature Astronomy, researchers led by Jamie Williams from the University of Warwick noted that the presence of niobium—an element that typically forms during a star's death—serves as a key indicator. New evidence suggests the white dwarf may be consuming material from a nearby giant planet formed from the star's former outer layers. Supporting this theory is a repeating 4.4-day brightness cycle. Recent re-analysis of archival Hubble data and TESS satellite observations suggests this theoretical planet may be similar in size to Jupiter and orbits the white dwarf at a distance of approximately 6 million kilometers. If confirmed, this would represent the first observed case of a second-generation planet orbiting a white dwarf, offering critical insights into the potential future of our own solar system as the Sun evolves.

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