{"paper":{"title":"Hydrogen-poor Superluminous Supernovae With Late-time H-alpha Emission: Three Events From the Intermediate Palomar Transient Factory","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"(10) LBL, (11) LCO, (12) JPL), 2), (2) IPAC, (3) Dark, (4) Weizman, (5) OKC, (6) SDSU, (7) GSFC, (8) UW, (9) LCO, A. De Cia (4), A. Gal-Yam (4), C. Fremling (5), C. McCully (11), D.A. Howell (9), D. Perley (3), E.O.Ofek (4), F.Masci (1, G. Hosseinzadeh (11), G. Leloudas (4), J. Sollerman (5), Lin Yan (1, M. L. Graham (8), O.Yaron (4), P. Nugent (10), P. Vreeswijk (4), P. Wo\\'zniak (Los Alamos) ((1) Caltech, R. Lunnan (1), R. Quimby (6), R. Roy (5), S.B. Cenko (7), S.R.Kulkarni (1), U.D. Rebbapragada (12)","submitted_at":"2017-04-17T17:51:51Z","abstract_excerpt":"We present observations of two new hydrogen-poor superluminous supernovae (SLSN-I), iPTF15esb and iPTF16bad, showing late-time H-alpha emission with line luminosities of (1-3)e+41 erg/s and velocity widths of (4000-6000) km/s. Including the previously published iPTF13ehe, this makes up a total of three such events to date. iPTF13ehe is one of the most luminous and the slowest evolving SLSNe-I, whereas the other two are less luminous and fast decliners. We interpret this as a result of the ejecta running into a neutral H-shell located at a radius of ~ 1.0e+16cm. This implies that violent mass l"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.05061","kind":"arxiv","version":3},"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"}