{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e6a6eb76dce74c142ad08c6618991fce23906a130795a14661b12840843fbf2b","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["2d025b6296bf4f2a01cede30a0cded9c679651620b88eb58ab72bbaa5eb1b608","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"d8662608410c10bcc4bdba1968cd07652bb8ca0d2bed0aeae2021e01df1da64b","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"astro.core-collapse-supernovae.sn1987a-remnant","kind":"well-posed","literature_status":"partially-resolved","n":"2","parents":[],"plain":"The 1987 supernova in a neighbouring galaxy produced a neutrino burst showing that a neutron star formed, and in 2024 JWST saw gas lit up by it, but the star itself is unseen.","posed_since":"1987","precise":"Determine whether the compact object in SN 1987A is a cooling neutron star or powers a pulsar wind nebula, and constrain its spin and magnetic field, from the JWST-detected narrow argon lines near the center, the disputed 2021-2022 hard X-ray detections attributed to a pulsar wind nebula, and ALMA dust constraints. Answer: an identification with a luminosity budget of $\\sim 10^{35}\\ \\text{to}\\ 10^{36}\\,\\mathrm{erg/s}$ consistent with all bands.","problem_ref":"2d025b6296bf4f2a01cede30a0cded9c679651620b88eb58ab72bbaa5eb1b608","references":"","settled_by":"Detection of thermal X-rays or pulsations from the center, or spatially resolved line diagnostics that discriminate a nebula from a bare cooling star.","status_note":"2024: JWST spectra showed argon lines ionized by a central source, consistent with a neutron star but not yet distinguishing thermal emission from a pulsar wind nebula.","title":"What kind of neutron star did SN 1987A leave?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"055ec1538a2f0bd67b12c8c11de138c029a8f7e9f58ae9ed91e8ad62a009013e","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"7140894ccc6602954abf2c98c8691c3602e9f330518eb71d4c2a63093a5b19d6","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"43ZI5oARlo1Z2CKuPaZPWRbS1gzl1WM8VJLkpqg0Fco9db_W22zUbK4da-FB3tJSEmQmADs6tKKNi15y_U2uCg"},"schema":"pubphys.envelope/1"},"record_hash":"055ec1538a2f0bd67b12c8c11de138c029a8f7e9f58ae9ed91e8ad62a009013e","leaf_index":2328}