{"paper":{"title":"JWST spectroscopy of SN 2010da/NGC 300 ULX-1: a surviving star hidden by dust","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"The donor star in SN 2010da has survived its outburst and returned to a heavily dust-obscured state.","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Ben Davies, Dominic J. Walton, Emma R. Beasor, Marianne Heida, Nathan Smith, Ryan Lau","submitted_at":"2026-04-15T10:41:05Z","abstract_excerpt":"We present new James Webb Space Telescope ($JWST$) NIRSpec and MIRI integral-field spectroscopy of the remarkable system SN~2010da / NGC~300 ULX-1, the only known ultraluminous X-ray source powered by a neutron star with a supergiant donor. Our new data, taken in November 2024, reveal that the optical and near-infrared counterpart has dramatically faded since 2018 and no longer exhibits molecular absorption features characteristic of a red supergiant. Instead, the spectral energy distribution shows the donor has returned to its pre-outburst appearance, and is dominated by infrared continuum co"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We conclude that the donor star is likely an AGB star that has survived and is now heavily enshrouded - having returned to a dust-obscured state following a transient post-outburst phase in which the system appeared as a red supergiant.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the radiative transfer modeling of the mid-IR SED uniquely identifies silicon carbide dust and that the measured bolometric luminosity of log(L/Lsun)=4.11 definitively indicates a surviving star rather than residual emission from other components or a failed supernova remnant.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"The donor star survived the 2010 outburst, returned to a dust-obscured AGB state, and is no longer visible as a red supergiant.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"The donor star in SN 2010da has survived its outburst and returned to a heavily dust-obscured state.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"03eb30efd4ddd727fdd31f2362f9c4a2605b855c1cfb8169b253ab06ed85e745"},"source":{"id":"2604.13711","kind":"arxiv","version":2},"verdict":{"id":"69211151-f26a-4456-b974-ab1e224d4caa","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T12:50:13.732817Z","strongest_claim":"We conclude that the donor star is likely an AGB star that has survived and is now heavily enshrouded - having returned to a dust-obscured state following a transient post-outburst phase in which the system appeared as a red supergiant.","one_line_summary":"The donor star survived the 2010 outburst, returned to a dust-obscured AGB state, and is no longer visible as a red supergiant.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the radiative transfer modeling of the mid-IR SED uniquely identifies silicon carbide dust and that the measured bolometric luminosity of log(L/Lsun)=4.11 definitively indicates a surviving star rather than residual emission from other components or a failed supernova remnant.","pith_extraction_headline":"The donor star in SN 2010da has survived its outburst and returned to a heavily dust-obscured state."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.13711/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}