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The composition of accreted debris has been shown to be diverse yet overall closely resembles Solar System bodies. Here we report the discovery of a white dwarf accreting material that is unlike any Solar System object. The atmosphere of HS 0209+0832 is strongly enriched in trans-iron elements including zinc, copper and niobium but depleted in the canonical rock-forming elements silicon and iron. The composition of the accreted object is consistent with a candidate second-generation planet, formed from the stellar material ejected during the giant phase. The key abundance signature that differentiates it from a first-generation planet is the high enrichment of s-process elements. Photospheric helium and the absence of terrestrial rock-forming elements implies that the white dwarf is accreting from the escaped atmosphere of a photo-evaporating giant planet candidate. This is further supported by the detection of a sinusoidal photometric period of 4.399 \u00b1 0.026\u2009days at an amplitude of 0.120% \u00b1 0.018%, which we attribute to thermal emission phase variability from a planetary day\u2013night cycle or a transiting cometary tail of an evaporating gas giant. The discovery of this second-generation planet that is chemically distinct from first-generation material demonstrates that close-in planets around white dwarfs can form after the main sequence.<\/jats:p>","DOI":"10.1038\/s41550-026-02983-7","type":"journal-article","created":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T15:03:23Z","timestamp":1791212603000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Discovery of a second-generation planet candidate accreting onto a white dwarf"],"prefix":"10.1038","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-8709-9689","authenticated-orcid":false,"given":"Jamie T.","family":"Williams","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2761-3005","authenticated-orcid":false,"given":"Boris T.","family":"G\u00e4nsicke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4337-9458","authenticated-orcid":false,"given":"Nicholas C.","family":"Stone","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6164-6978","authenticated-orcid":false,"given":"Detlev","family":"Koester","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-5659-9006","authenticated-orcid":false,"given":"Benjamin D. 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