Overview
- Researchers reanalyzed archival Hubble spectra and identified an unprecedented excess of the heavy element niobium in the white dwarf HS 0209+0832, a result the team published Monday in Nature Astronomy.
- Independent ultraviolet data and a faint 4.4‑day brightness modulation in TESS observations support the idea of a close, Jupiter‑sized companion whose atmosphere could be being stripped and accreted onto the white dwarf.
- The authors interpret the chemical pattern as material from a second‑generation or “phoenix” planet that formed from the star’s expelled, s‑process–rich ejecta, a scenario that likely requires a companion to spin ejecta into a disk before planet formation.
- The claim is a candidate, not a confirmed planet, and the team has requested targeted follow‑up with Hubble, Chandra and JWST to test the companion’s orbit, the accretion flow and alternative explanations.
- If validated, the finding would give astronomers a new way to search for reborn planets and would change how we think about planetary outcomes after stellar death because heavy elements normally sink in white dwarfs and thus signal recent external accretion.