{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:JG2FRZWMOMZ4WATHIA6KXOCVLY","short_pith_number":"pith:JG2FRZWM","schema_version":"1.0","canonical_sha256":"49b458e6cc7333cb0267403cabb8555e3e0cbf10f122ccf1443b4633542f5acd","source":{"kind":"arxiv","id":"1608.02995","version":2},"attestation_state":"computed","paper":{"title":"Superluminous supernova 2015bn in the nebular phase: evidence for the engine-powered explosion of a stripped massive star","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. Gal-Yam, A. Jerkstrand, C. Inserra, C. McCully, D. A. Howell, D. Milisavljevic, D. R. Young, E. A. Magnier, E. Berger, E. Kankare, G. Hosseinzadeh, I. Arcavi, K. C. Chambers, K. Maguire, K. W. Smith, M. Nicholl, O. Yaron, P. A. Mazzali, P. Challis, P. K. Blanchard, P. .S. Cowperthwaite, R. Chornock, R. J. Wainscoat, R. Margutti, S. J. Smartt, S. Taubenberger, S. Valenti, T.-W. Chen","submitted_at":"2016-08-09T22:20:46Z","abstract_excerpt":"We present nebular-phase imaging and spectroscopy for the hydrogen-poor superluminous supernova SN 2015bn, at redshift z=0.1136, spanning +250-400 d after maximum light. The light curve exhibits a steepening in the decline rate from 1.4 mag/(100 d) to 1.7 mag/(100 d), suggestive of a significant decrease in the opacity. This change is accompanied by a transition from a blue continuum superposed with photospheric absorption lines to a nebular spectrum dominated by emission lines of oxygen, calcium and magnesium. There are no obvious signatures of circumstellar interaction or large nickel mass. "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1608.02995","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-08-09T22:20:46Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"0c97377101fe29f68383201a0ae35466f9c141f130654a14be173c6148327e32","abstract_canon_sha256":"62afc57a37b4a207b39353f75fc0c8c17695a6c8ac8b29146392646e5c227551"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:53.337307Z","signature_b64":"0Y87p2A2IkyVjjPl9TDhOZLOziWkgZ9JETK3iO18AWVViDiUb+fBoYEqqxknnGyqwM+RjBszu90XlZEYxpVSDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"49b458e6cc7333cb0267403cabb8555e3e0cbf10f122ccf1443b4633542f5acd","last_reissued_at":"2026-05-18T01:04:53.336749Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:53.336749Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Superluminous supernova 2015bn in the nebular phase: evidence for the engine-powered explosion of a stripped massive star","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. Gal-Yam, A. Jerkstrand, C. Inserra, C. McCully, D. A. Howell, D. Milisavljevic, D. R. Young, E. A. Magnier, E. Berger, E. Kankare, G. Hosseinzadeh, I. Arcavi, K. C. Chambers, K. Maguire, K. W. Smith, M. Nicholl, O. Yaron, P. A. Mazzali, P. Challis, P. K. Blanchard, P. .S. Cowperthwaite, R. Chornock, R. J. Wainscoat, R. Margutti, S. J. Smartt, S. Taubenberger, S. Valenti, T.-W. Chen","submitted_at":"2016-08-09T22:20:46Z","abstract_excerpt":"We present nebular-phase imaging and spectroscopy for the hydrogen-poor superluminous supernova SN 2015bn, at redshift z=0.1136, spanning +250-400 d after maximum light. The light curve exhibits a steepening in the decline rate from 1.4 mag/(100 d) to 1.7 mag/(100 d), suggestive of a significant decrease in the opacity. This change is accompanied by a transition from a blue continuum superposed with photospheric absorption lines to a nebular spectrum dominated by emission lines of oxygen, calcium and magnesium. There are no obvious signatures of circumstellar interaction or large nickel mass. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.02995","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1608.02995","created_at":"2026-05-18T01:04:53.336831+00:00"},{"alias_kind":"arxiv_version","alias_value":"1608.02995v2","created_at":"2026-05-18T01:04:53.336831+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.02995","created_at":"2026-05-18T01:04:53.336831+00:00"},{"alias_kind":"pith_short_12","alias_value":"JG2FRZWMOMZ4","created_at":"2026-05-18T12:30:25.849896+00:00"},{"alias_kind":"pith_short_16","alias_value":"JG2FRZWMOMZ4WATH","created_at":"2026-05-18T12:30:25.849896+00:00"},{"alias_kind":"pith_short_8","alias_value":"JG2FRZWM","created_at":"2026-05-18T12:30:25.849896+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2605.19571","citing_title":"From mass-loss histories to lightcurves: a generalised framework for interaction-powered transients","ref_index":27,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY","json":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY.json","graph_json":"https://pith.science/api/pith-number/JG2FRZWMOMZ4WATHIA6KXOCVLY/graph.json","events_json":"https://pith.science/api/pith-number/JG2FRZWMOMZ4WATHIA6KXOCVLY/events.json","paper":"https://pith.science/paper/JG2FRZWM"},"agent_actions":{"view_html":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY","download_json":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY.json","view_paper":"https://pith.science/paper/JG2FRZWM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1608.02995&json=true","fetch_graph":"https://pith.science/api/pith-number/JG2FRZWMOMZ4WATHIA6KXOCVLY/graph.json","fetch_events":"https://pith.science/api/pith-number/JG2FRZWMOMZ4WATHIA6KXOCVLY/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY/action/storage_attestation","attest_author":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY/action/author_attestation","sign_citation":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY/action/citation_signature","submit_replication":"https://pith.science/pith/JG2FRZWMOMZ4WATHIA6KXOCVLY/action/replication_record"}},"created_at":"2026-05-18T01:04:53.336831+00:00","updated_at":"2026-05-18T01:04:53.336831+00:00"}