Overview
- A University of Warwick team published a Nature Astronomy paper on Thursday describing a candidate second‑generation planet orbiting the white dwarf HS 0209+0832 about 270 light‑years away.
- High‑resolution spectra show an unusual heavy‑element pattern dominated by s‑process products, including exceptionally strong niobium, which the authors say points to material made during the star’s red‑giant phase rather than a normal first‑generation planet.
- Archival and recent photometry, including data from NASA’s TESS, reveal a faint repeating 4.4‑day brightness variation that the team interprets as consistent with a close, likely tidally locked, Jupiter‑sized companion but the signal is still tentative.
- The researchers argue the companion appears to be losing atmosphere that is accreting onto the white dwarf, and they have requested targeted follow‑up observations with HST, JWST, Chandra and more photometry to confirm the body and measure ongoing mass transfer.
- If confirmed this would be the first reported second‑generation planet around a white dwarf and would offer a new way to find reborn worlds and reshape ideas about planet formation after a star’s death, especially given HS 0209+0832’s unusually hot, young state that aids detectability.