{"paper":{"title":"PTF11eon/SN2011dh: Discovery of a Type IIb Supernova From a Compact Progenitor in the Nearby Galaxy M51","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Alexei V. Filippenko, Amedee Riou, Assaf Horesh, Assaf Sternberg, Avishay Gal-Yam, Chris J. Mottram, David Bersier, David Polishook, Derek B. Fox, Dong Xu, Dovi Poznanski, Elena Pian, Eli Waxman, Emma S. Walker, Eran O. Ofek, Evgeny Gorbikov, Iair Arcavi, Ilan Manulis, Itay Rabinak, Jeffrey M. Silverman, Jonathan M. Marchant, Joshua S. Bloom, Judith G. Cohen, Kate Maquire, Kelsey I. Clubb, Mansi M. Kasliwal, Mark Sullivan, Michael T. Kandrashoff, Ofer Yaron, Paulo A. Mazzali, Peter E. Nugent, Philip James, Robert J. Smith, Robert M. Barnsley, Robert M. Quimby, Sagi Ben-Ami, S. Bradley Cenko, Shrinivas R. Kulkarni, Stephane Lamotte-Bailey, Thomas Griga, Thomas Matheson, Weidong Li, Yen-Chen Pan","submitted_at":"2011-06-17T19:13:54Z","abstract_excerpt":"On May 31, 2011 UT a supernova (SN) exploded in the nearby galaxy M51 (the Whirlpool Galaxy). We discovered this event using small telescopes equipped with CCD cameras, as well as by the Palomar Transient Factory (PTF) survey, and rapidly confirmed it to be a Type II supernova. Our early light curve and spectroscopy indicates that PTF11eon resulted from the explosion of a relatively compact progenitor star as evidenced by the rapid shock-breakout cooling seen in the light curve, the relatively low temperature in early-time spectra and the prompt appearance of low-ionization spectral features. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1106.3551","kind":"arxiv","version":1},"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"}