Overview
- The University of Warwick team published a Nature Astronomy paper on Monday, October 5, reporting a candidate second‑generation planet around white dwarf HS 0209+0832 based on reanalysis of archival Hubble spectra and TESS photometry.
- Hubble spectroscopy shows an unusual heavy‑element pattern dominated by s‑process products, most notably extremely high niobium, which the authors argue is a fingerprint of material produced during the star's red‑giant death phase.
- NASA's TESS data reveal a faint 4.4‑day periodic brightness signal consistent with a close, tidally locked gas giant a few million kilometres from the white dwarf, but the photometric detection is not yet definitive.
- The authors propose the planet formed from the star's expelled layers that were captured into a disc—likely because a companion pulled material back into orbit—and that the planet is now losing atmosphere that accretes onto the white dwarf.
- Team members have requested follow‑up observations with Hubble, Chandra and time on the James Webb Space Telescope to test the planet interpretation, measure accretion flows, and clarify how often such 'phoenix' worlds might form.