{"paper":{"title":"The Progenitor of Supernova 2011dh/PTF11eon in Messier 51","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.CO","authors_text":"(2) UC Berkeley, (3) Caltech, 4), (4) Einstein Fellow, (5) IfA/Hawaii, 6), (6) Hubble Fellow, (7) Weizmann Institute), Adam L. Kraus (5, Alexei V. Filippenko (2), Assaf Horesh (3), Avishay Gal-Yam (7), David Polishook (7) ((1) Spitzer Science Center/Caltech, Eran O. Ofek (3, Iair Arcavi (7), Jeffrey M. Silverman (2), Mansi M. Kasliwal (3), Ofer Yaron (7), Robert M. Quimby (3), S. Bradley Cenko (2), Schuyler D. Van Dyk (1), Shrinivas R. Kulkarni (3), Weidong Li (2)","submitted_at":"2011-06-15T08:08:41Z","abstract_excerpt":"We have identified a luminous star at the position of supernova (SN) 2011dh/PTF11eon, in pre-SN archival, multi-band images of the nearby, nearly face-on galaxy Messier 51 (M51) obtained by the Hubble Space Telescope with the Advanced Camera for Surveys. This identification has been confirmed, to the highest available astrometric precision, using a Keck-II adaptive-optics image. The available early-time spectra and photometry indicate that the SN is a stripped-envelope, core-collapse Type IIb, with a more compact progenitor (radius ~1e11 cm) than was the case for the well-studied SN IIb 1993J."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1106.2897","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}