{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:FRJV4J6VOSUFVJMTPYSF3LMECV","short_pith_number":"pith:FRJV4J6V","canonical_record":{"source":{"id":"1804.03666","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-04-10T18:00:13Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"aa4e6ffdf9f21e97091db3343b5062de7ce4717ffc46374aed5069db54e93829","abstract_canon_sha256":"e8667ddd89e0a355427276837b4728a5bdfe08c4ab73c86e18285f35888ed8ff"},"schema_version":"1.0"},"canonical_sha256":"2c535e27d574a85aa5937e245dad841548b1087c431684bfee3c661be816b962","source":{"kind":"arxiv","id":"1804.03666","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.03666","created_at":"2026-05-18T00:08:15Z"},{"alias_kind":"arxiv_version","alias_value":"1804.03666v2","created_at":"2026-05-18T00:08:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.03666","created_at":"2026-05-18T00:08:15Z"},{"alias_kind":"pith_short_12","alias_value":"FRJV4J6VOSUF","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"FRJV4J6VOSUFVJMT","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"FRJV4J6V","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:FRJV4J6VOSUFVJMTPYSF3LMECV","target":"record","payload":{"canonical_record":{"source":{"id":"1804.03666","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-04-10T18:00:13Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"aa4e6ffdf9f21e97091db3343b5062de7ce4717ffc46374aed5069db54e93829","abstract_canon_sha256":"e8667ddd89e0a355427276837b4728a5bdfe08c4ab73c86e18285f35888ed8ff"},"schema_version":"1.0"},"canonical_sha256":"2c535e27d574a85aa5937e245dad841548b1087c431684bfee3c661be816b962","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:15.033180Z","signature_b64":"7/6vYzPY/fv/bqyqdA1E0jzFaZhgyOwDa+W7VfFbl+5S/jIKt7Ze3ygPqn5x2L39WporNCQRCkRiUWuwF1OPAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c535e27d574a85aa5937e245dad841548b1087c431684bfee3c661be816b962","last_reissued_at":"2026-05-18T00:08:15.032818Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:15.032818Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.03666","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:08:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6l4pcCguOgEEueABMkoqUT9yM3CIF/jubp+dHxzsSiSn4tjw792jG2O8lZDFR9rgtTf8JFD/erNCCgEJBpFXDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T04:32:13.720968Z"},"content_sha256":"3dce0d81e13537c0c025a14d2840ddc42f9461ff1ae93f8738ff05d8e4cd54ab","schema_version":"1.0","event_id":"sha256:3dce0d81e13537c0c025a14d2840ddc42f9461ff1ae93f8738ff05d8e4cd54ab"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:FRJV4J6VOSUFVJMTPYSF3LMECV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nebular Spectroscopy of the `Blue Bump' Type Ia Supernova 2017cbv","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"C. McCully, C. Wheeler, D. A. Howell, D. Hiramatsu, D. J. Sand, D. Kasen, E. Y. Hsiao, G. H. Marion, G. Hosseinzadeh, J. Boty\\'anszki, J. Burke, L. Tartaglia, M. L. Graham, N. Suntzeff, R. Cartier, S. Kumar, S. Valenti, S. W. Jha, S. Wyatt, T. Diamond","submitted_at":"2018-04-10T18:00:13Z","abstract_excerpt":"We present nebular phase optical and near-infrared spectroscopy of the Type Ia supernova (SN) 2017cbv. The early light curves of SN~2017cbv showed a prominent blue bump in the $U$, $B$ and $g$ bands lasting for $\\sim$5 d. One interpretation of the early light curve was that the excess blue light was due to shocking of the SN ejecta against a nondegenerate companion star -- a signature of the single degenerate scenario. If this is the correct interpretation, the interaction between the SN ejecta and the companion star could result in significant H$\\alpha$ (or helium) emission at late times, pos"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.03666","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:08:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vyV3rEO7YGKZnEZDg/pC9r8KbJM1OoB1K/AlAm0dM73Fl9qV3ifYu/QMV8x5AJ4vjaYxglBu5X1PYBOsgCh6Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T04:32:13.721690Z"},"content_sha256":"04ad601e3cf7a90980f57158209183dff6f9eb54f049932faaaffabba71bf8dd","schema_version":"1.0","event_id":"sha256:04ad601e3cf7a90980f57158209183dff6f9eb54f049932faaaffabba71bf8dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FRJV4J6VOSUFVJMTPYSF3LMECV/bundle.json","state_url":"https://pith.science/pith/FRJV4J6VOSUFVJMTPYSF3LMECV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FRJV4J6VOSUFVJMTPYSF3LMECV/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-20T04:32:13Z","links":{"resolver":"https://pith.science/pith/FRJV4J6VOSUFVJMTPYSF3LMECV","bundle":"https://pith.science/pith/FRJV4J6VOSUFVJMTPYSF3LMECV/bundle.json","state":"https://pith.science/pith/FRJV4J6VOSUFVJMTPYSF3LMECV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FRJV4J6VOSUFVJMTPYSF3LMECV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:FRJV4J6VOSUFVJMTPYSF3LMECV","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"e8667ddd89e0a355427276837b4728a5bdfe08c4ab73c86e18285f35888ed8ff","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-04-10T18:00:13Z","title_canon_sha256":"aa4e6ffdf9f21e97091db3343b5062de7ce4717ffc46374aed5069db54e93829"},"schema_version":"1.0","source":{"id":"1804.03666","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.03666","created_at":"2026-05-18T00:08:15Z"},{"alias_kind":"arxiv_version","alias_value":"1804.03666v2","created_at":"2026-05-18T00:08:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.03666","created_at":"2026-05-18T00:08:15Z"},{"alias_kind":"pith_short_12","alias_value":"FRJV4J6VOSUF","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"FRJV4J6VOSUFVJMT","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"FRJV4J6V","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:04ad601e3cf7a90980f57158209183dff6f9eb54f049932faaaffabba71bf8dd","target":"graph","created_at":"2026-05-18T00:08:15Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We present nebular phase optical and near-infrared spectroscopy of the Type Ia supernova (SN) 2017cbv. The early light curves of SN~2017cbv showed a prominent blue bump in the $U$, $B$ and $g$ bands lasting for $\\sim$5 d. One interpretation of the early light curve was that the excess blue light was due to shocking of the SN ejecta against a nondegenerate companion star -- a signature of the single degenerate scenario. If this is the correct interpretation, the interaction between the SN ejecta and the companion star could result in significant H$\\alpha$ (or helium) emission at late times, pos","authors_text":"C. McCully, C. Wheeler, D. A. Howell, D. Hiramatsu, D. J. Sand, D. Kasen, E. Y. Hsiao, G. H. Marion, G. Hosseinzadeh, J. Boty\\'anszki, J. Burke, L. Tartaglia, M. L. Graham, N. Suntzeff, R. Cartier, S. Kumar, S. Valenti, S. W. Jha, S. Wyatt, T. Diamond","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-04-10T18:00:13Z","title":"Nebular Spectroscopy of the `Blue Bump' Type Ia Supernova 2017cbv"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.03666","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:3dce0d81e13537c0c025a14d2840ddc42f9461ff1ae93f8738ff05d8e4cd54ab","target":"record","created_at":"2026-05-18T00:08:15Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"e8667ddd89e0a355427276837b4728a5bdfe08c4ab73c86e18285f35888ed8ff","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-04-10T18:00:13Z","title_canon_sha256":"aa4e6ffdf9f21e97091db3343b5062de7ce4717ffc46374aed5069db54e93829"},"schema_version":"1.0","source":{"id":"1804.03666","kind":"arxiv","version":2}},"canonical_sha256":"2c535e27d574a85aa5937e245dad841548b1087c431684bfee3c661be816b962","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2c535e27d574a85aa5937e245dad841548b1087c431684bfee3c661be816b962","first_computed_at":"2026-05-18T00:08:15.032818Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:15.032818Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7/6vYzPY/fv/bqyqdA1E0jzFaZhgyOwDa+W7VfFbl+5S/jIKt7Ze3ygPqn5x2L39WporNCQRCkRiUWuwF1OPAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:15.033180Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.03666","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3dce0d81e13537c0c025a14d2840ddc42f9461ff1ae93f8738ff05d8e4cd54ab","sha256:04ad601e3cf7a90980f57158209183dff6f9eb54f049932faaaffabba71bf8dd"],"state_sha256":"4768e3bf8bbbd583ca6b29dd97e4bb2a4e3212bdbee60c299848d24c3dfbaa54"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pIQqEkRaQU//XB43LC+QlEYl6nA45/J5tCKb+cCEy5aJgTawT0WeOjeruvFJq9Y04pn5gyuNHdYs6C/WP25VBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T04:32:13.725556Z","bundle_sha256":"ba665e33d33f3ef15c4dccf6c156240c8e5cd26c86148170a754ef5c9bbbab6f"}}