{"schema":"pubphys.bundle/1","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},"content_withheld":"false","files":[],"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"055ec1538a2f0bd67b12c8c11de138c029a8f7e9f58ae9ed91e8ad62a009013e","schema":"pubphys.attested/1"},"id_token":null,"id_token_withheld":"false","envelope":{"attested_hash":"7140894ccc6602954abf2c98c8691c3602e9f330518eb71d4c2a63093a5b19d6","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"43ZI5oARlo1Z2CKuPaZPWRbS1gzl1WM8VJLkpqg0Fco9db_W22zUbK4da-FB3tJSEmQmADs6tKKNi15y_U2uCg"},"schema":"pubphys.envelope/1"},"ots":{"attested":["AE9wZW5UaW1lc3RhbXBzAABQcm9vZgC_ieLohOiSlAEIcUCJTMxmApVKvyyYyGkcNgLp8zBRjrcdTCpjCTpbGdbwIHGl6Z6mLG56wYuJaQj69O1KEKZu59QtGov1IzgGLF-7CPAgG3hhXYJjg0WVRNVKJqd_QhpxTdydjy5kn_XYhJz8IIYI8CAgELvoEaR6vHj-K6ByCYUuO8LLX0JRDaOd5mCyGo5L0AjwIDK4ULs1zdGprGpTbVN7iMj33vuKa3h6lhbSCZTubJHmCPAgbD3oVdvyMGPCqU-_PMyQW6wG486DzO9ZjhmXG5v4pocI8SBR77HhqgThK3sew4FZkwOgoLGO0WZVG8EdujnmZJYlrgjxIMuYGb9HTwrEORPUiiEUtDprOei6qtfzU-FVLuE2Gni_CPEgV483a5w_VdTK7my82rqJCPIXOvGhZNeRkwqfWifoP4MI8SBcP9hQb3hxUiLf8dFx-DuqZHA2xkmG-c_qCFt8QfQHCAjwIOv_x0B6HyZ6WMHKeIf_d_EUIvwPGdZeVY-hXN3RLDM5CPEgHd9u6OIGCvUV12A1B1xdiOprSJ-4w0cqwfe7CzVX5HsI8CDQo_sIWZiWXaTGRSQBLmU-lHJKskYKqsjO1r02DhB8LAj_8Ajn9YmozHwo9QjwEJ46aM9ZDv3TdtqV3ZbRsNgI8SBOF8pILGf1kodr5MKmQs6Cd93joraGn3g6UPt_-kewPwjwIOG-gmM7bd_eR4AiDMNfluS3xvr7vicLR-sCBr5qtG2cCPAgrVNFrCoeQcCxhlmnE0BzHgR8HQpZAlfqzDDFzfWb8GUI8QRq0WWT8AjZJ2cF_c7k8ACD3-MNLvkMjiwraHR0cHM6Ly9ib2IuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZ_AI9ZMS1zxd7IEI8BDd00WgJZ0RncsC1Fyai_4aCPEgvxMFrnu7F05IW5INiraQ3OVEYMjNx6JfBxw1Q4jPLi4I8QRq0WWS8Ag2zxPAtI5JsP8Ag9_jDS75DI4uLWh0dHBzOi8vYWxpY2UuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZwjxIHAnv4KFFf4uiYEFJvLxiMxSyz8VowJP4roTfDD9h7bICPAgj5tgvbNF7mxSP4jGGE66ezUFRLnI4g1VTkvuV4VtCPAI8CCxlc1HuKORuHgn7DYIYcDhc4oo99OkTWBEvddBypoa7AjwIFcjjaF8kDNDYCZGaNISlRjvX-I7in-QNwsr4JYQbFJvCPAgnl0k4gs7LuY5i1umiHO-J7My3uBThLJUWQoY9LdVSrQI8SA6-Ft11_K_GqMNWYhkVsVqCFvXSYbp4S8JoLsLBnUzvgjxIBC8_mAE7JBP35SNxDBcG7joLJwURpMxdV2vSO64_jEOCPEge04Coj1xSi7CE8UwqiBGNhPyZ5QdD_YZwn-heSdObU4I8SBgdDSgr3VUx1j8m_pK7-OzMwwFgXeLy43ujffCv-hf5AjwIMl-PnAt4xjoBEVU4-nkyN0NKRa9AvX4kEMfllFyIJS9CPFZAQAAAAHz4rV-uwQFg02bVnEMUFgpIdGKjM4tWuID1kTVnrjisAAAAAAA_v___wJURAIAAAAAABYAFBFys2oc0-U-bYrC3VulGLzND5fbAAAAAAAAAAAiaiDwBHLTDgAICPEgMJIBYi46xOIuFDwzJ9nOx14ngW5HbglUf65ORpkoIYcICPAgHgGWEGCDHWgscwT92NOoJ7s-ezbPkyiWr2RnYZDC_dwICPAgtffMyyLu-MscJsDc0dzwGspwSrrmvVAnMNgsgWhHClgICPAgMUl1OfBDUwhp5VZjHwVA0nuz1F5HZTUJCHAnM1L1F3MICPAgStK7UWpnrUueV5EaE7uE0y6BLMp6EANmrbhrTqEBZu8ICPAg5LVW7IHtUL5mNOvPx1hOTfLMmqlQ7t9EFW-KDtrISIQICPAgABgXZ6upFU8qiDQKFtQFpqkjKwl0PsxM4JUjVLlDKbkICPAgEwb96FiOhjlbwI8GFZQ4a5GXwxs4bUdqVOMKrtBWV30ICPEgqBg-wp0c8CAPV9k6J7wIa9_GtQfpWmhpE1zqFZyi2pQICPAg2pZLTVPGJbriiz0UhMytYDVYAXOgQnWDcrMOewK9O8cICPEgxm3QwzbvT4siJzubQGnST67bWv-exYwSPP1KDi7CaUwICPEgm6udUudfjUaM0gUFTylKGDMypj7ptMTG0zmxd_T5yTcICPAgMpOInkjFCVp1pOZhfZnyPAl8hdWGmHzQcrGLgLwSKLgICAAFiJYNc9cZAQPzpjs"],"envelope":["AE9wZW5UaW1lc3RhbXBzAABQcm9vZgC_ieLohOiSlAEId8la8W4h-uRhg1HhvU5nSzAvMUqxRp45YXF6r0OfrMnxIHeFdzXOEu3gA0VI13kvuETh55wTkobgnQuv9X2kOvYGCPAg44qiVsd2npNvG0yKXQuywkoisQfJzC1ug3eNcoklL7gI8CCIXxamG7wrpkNUjK1L58kp36vbCMbJ2EEuLd7lZQrTVgjxID3iBRXCLpiZteh5wilY93dbgVHkrWpaF_fRV91zOaxQCPAgTTwKf6gQ4DIL_U89IVvzH_1jYEkCDSnEOOYNFUvHEQ8I8SAg0SPTm2YusliAXUg1qigGYr48M79VcZClF4L35c9xfwjwIEQF4hADQAPlH4RzMsQUXVIOYwsz7Y4pgmwuTmlv8BRGCPAgXx45yhBgitlxXZoPiY801JhflemOgnxVewLKiGj6hiYI8CCCFfNrg2ZeB51PNa84j-z6Sin0AxT6aP9r7HupgUKbMwjxICknnLxa8xs8qmAdhtb0NnANbtwYyrlRTgqcMVLLl8ogCPEgHd9u6OIGCvUV12A1B1xdiOprSJ-4w0cqwfe7CzVX5HsI8CDQo_sIWZiWXaTGRSQBLmU-lHJKskYKqsjO1r02DhB8LAj_8Ajn9YmozHwo9QjwEJ46aM9ZDv3TdtqV3ZbRsNgI8SBOF8pILGf1kodr5MKmQs6Cd93joraGn3g6UPt_-kewPwjwIOG-gmM7bd_eR4AiDMNfluS3xvr7vicLR-sCBr5qtG2cCPAgrVNFrCoeQcCxhlmnE0BzHgR8HQpZAlfqzDDFzfWb8GUI8QRq0WWT8AjZJ2cF_c7k8ACD3-MNLvkMjiwraHR0cHM6Ly9ib2IuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZ_AI9ZMS1zxd7IEI8BDd00WgJZ0RncsC1Fyai_4aCPEgvxMFrnu7F05IW5INiraQ3OVEYMjNx6JfBxw1Q4jPLi4I8QRq0WWS8Ag2zxPAtI5JsP8Ag9_jDS75DI4uLWh0dHBzOi8vYWxpY2UuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZwjxIHAnv4KFFf4uiYEFJvLxiMxSyz8VowJP4roTfDD9h7bICPAgj5tgvbNF7mxSP4jGGE66ezUFRLnI4g1VTkvuV4VtCPAI8CCxlc1HuKORuHgn7DYIYcDhc4oo99OkTWBEvddBypoa7AjwIFcjjaF8kDNDYCZGaNISlRjvX-I7in-QNwsr4JYQbFJvCPAgnl0k4gs7LuY5i1umiHO-J7My3uBThLJUWQoY9LdVSrQI8SA6-Ft11_K_GqMNWYhkVsVqCFvXSYbp4S8JoLsLBnUzvgjxIBC8_mAE7JBP35SNxDBcG7joLJwURpMxdV2vSO64_jEOCPEge04Coj1xSi7CE8UwqiBGNhPyZ5QdD_YZwn-heSdObU4I8SBgdDSgr3VUx1j8m_pK7-OzMwwFgXeLy43ujffCv-hf5AjwIMl-PnAt4xjoBEVU4-nkyN0NKRa9AvX4kEMfllFyIJS9CPFZAQAAAAHz4rV-uwQFg02bVnEMUFgpIdGKjM4tWuID1kTVnrjisAAAAAAA_v___wJURAIAAAAAABYAFBFys2oc0-U-bYrC3VulGLzND5fbAAAAAAAAAAAiaiDwBHLTDgAICPEgMJIBYi46xOIuFDwzJ9nOx14ngW5HbglUf65ORpkoIYcICPAgHgGWEGCDHWgscwT92NOoJ7s-ezbPkyiWr2RnYZDC_dwICPAgtffMyyLu-MscJsDc0dzwGspwSrrmvVAnMNgsgWhHClgICPAgMUl1OfBDUwhp5VZjHwVA0nuz1F5HZTUJCHAnM1L1F3MICPAgStK7UWpnrUueV5EaE7uE0y6BLMp6EANmrbhrTqEBZu8ICPAg5LVW7IHtUL5mNOvPx1hOTfLMmqlQ7t9EFW-KDtrISIQICPAgABgXZ6upFU8qiDQKFtQFpqkjKwl0PsxM4JUjVLlDKbkICPAgEwb96FiOhjlbwI8GFZQ4a5GXwxs4bUdqVOMKrtBWV30ICPEgqBg-wp0c8CAPV9k6J7wIa9_GtQfpWmhpE1zqFZyi2pQICPAg2pZLTVPGJbriiz0UhMytYDVYAXOgQnWDcrMOewK9O8cICPEgxm3QwzbvT4siJzubQGnST67bWv-exYwSPP1KDi7CaUwICPEgm6udUudfjUaM0gUFTylKGDMypj7ptMTG0zmxd_T5yTcICPAgMpOInkjFCVp1pOZhfZnyPAl8hdWGmHzQcrGLgLwSKLgICAAFiJYNc9cZAQPzpjs"]},"log":{"leaf_index":"2328","tree_size":"3804","proof":["192138004ac4997bc1179f7b1c538f1151a6210f8dc3aab968f1be3b8a26451c","6cebecbcdca784e1d5a611f5efa0357c34756875f886c7f7e696f788c15c0f5c","efa70b633aa6bbe37d3db8eef7c907a96c8a5c3751a8d552ab229adf01f4ffdc","93725799af8ee79e10e234214b22e9a88f129e4f3f946c48a3ceabc8f394018a","a03726c05606beb121c466af2668523ba89eb290ff188405ea9f8094c2404990","e09d75cff20d1de31b67dd1a22b2d67fcb4ad05dc5c26ca84ca22f8e5edc939e","977eb21344b8ed566079e783be2c57fef659104f825596ed3f3836b243b32eed","0e333b0bb1d5b3a0837c7007c90874beee2fb89206b164572bfa2f0648b1cb1e","ad2bf8922b230304eb5887f66a1631d0d013048aef3d1e5c2bce55da65e76cef","453fe2db8b5276d732edac85634e8be036b4709a91a2584f32a4b9edcc8ca9de","325287f5a43e4f3ad4072ec4bd53d43c50c1393021a056122e9cb0fad83b868f","3c578dccc15502c5f3efe228cadc99fee76ab536ed01f66b14d316fdcc157429"],"checkpoint":"pubphys.com/log/v1\n3804\nAK6t4qgu96+M9wScTrIlsJ10d/zhKVEtYguyM3aeJvo=\n\n— pubphys.com/log/v1 JFPwIPP8EtoxgcsQg7V7CwIdL4UKPqJtpv+eB8sFNJjyQHIdyA1VabmBsPyLqq2bLxJPn57rA6fQi8y0QDDjRXHvlQg=\n","promise":"pubphys.com/log/v1 promise\n5dbf244f3d4de9693309258d82213debd03869acd9c3cd6481c14f1180574e77\n2328\n2026-10-15T23:43:57Z\n2026-10-16T01:43:57Z\n\n— pubphys.com/log/v1 JFPwII77EUZBB/VR8wnXXjdQVX+Q7cDrf6rNw5SO1wDzASqe6hEEhahjI+1DPs7/yZdLPBEUs7bDJVpa61y7PVRpgww=\n"},"orcid_key_evidence":[],"attesting":null}