{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"277d25490825d20eae55fd7da4fc7a94885976f70692504cef477ea68b0044a2","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"2e843c2c48010cbdcbf46ccf8c38d3e868ef0257b9ac7d5e9460b4ab3ae3bd6f","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":"1","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 $\\sim 1e35\\ \\text{to}\\ 1e36\\,\\mathrm{erg/s}$ consistent with all bands.","problem_ref":null,"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 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