{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"7aba7f1de25094d137446a074864e2c6fdc38cbad0c1d85f2a9746b6100bca17","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"131cbe10c91904200fde3ce7251c6effaadb6e8850bf0389e4d8b45751467f37","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"astro.sn-ia-progenitors","field":"astro","n":"1","review_cite":"Z.-W. Liu, F. K. Roepke, Z. Han, Type Ia Supernova Explosions in Binary Systems: A Review, Research in Astronomy and Astrophysics, 2023","review_link":"https://doi.org/10.1088/1674-4527/acd89e","review_verified":"true","summary":"Type Ia supernovae are thermonuclear explosions of white dwarfs, the dense leftover cores of Sun-like stars, and they serve as standard candles for measuring the expansion of the universe. Which binary systems produce them, and several puzzles in how white dwarfs cool and become magnetic, are still unresolved.","title":"Type Ia supernova progenitors and white dwarfs","topic_ref":null,"why":"Cosmological distances, iron production in galaxies and white-dwarf age dating all depend on knowing how these stars evolve and explode."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"725883c9f1fa87da8eacd23b3ad9211426658a588d96f1c1bbacc3e7a502c79e","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"00fb93c4f953276eb1511ac1e3ada73e00246950ff8bcc30f14ce21aa68cef8c","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"ytwM_zEUX73mVeHgrb2b-XO9bVQribcXPWSEkhHpnl4Rvw1ZKiQRjn6FP5w-WIpOhPUxon3z0TG6m73S3B0HDg"},"schema":"pubphys.envelope/1"},"record_hash":"725883c9f1fa87da8eacd23b3ad9211426658a588d96f1c1bbacc3e7a502c79e","leaf_index":52}