{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:2U4PWMTK63MSBZ4BNS26LSJ2L5","short_pith_number":"pith:2U4PWMTK","canonical_record":{"source":{"id":"1103.1671","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-09T00:18:31Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"e8a0eda99394fec024b0416ef5ae14e8c9e137056a061e1b00a1ff676545e9d7","abstract_canon_sha256":"39f97996fc8fc2f810c42dd1fb56aa2c3becbaceff743166a074061c016e3d01"},"schema_version":"1.0"},"canonical_sha256":"d538fb326af6d920e7816cb5e5c93a5f5f3ff1c44b7e411d3f53f698b47a0194","source":{"kind":"arxiv","id":"1103.1671","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.1671","created_at":"2026-05-18T02:02:56Z"},{"alias_kind":"arxiv_version","alias_value":"1103.1671v1","created_at":"2026-05-18T02:02:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.1671","created_at":"2026-05-18T02:02:56Z"},{"alias_kind":"pith_short_12","alias_value":"2U4PWMTK63MS","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"2U4PWMTK63MSBZ4B","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"2U4PWMTK","created_at":"2026-05-18T12:26:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:2U4PWMTK63MSBZ4BNS26LSJ2L5","target":"record","payload":{"canonical_record":{"source":{"id":"1103.1671","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-09T00:18:31Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"e8a0eda99394fec024b0416ef5ae14e8c9e137056a061e1b00a1ff676545e9d7","abstract_canon_sha256":"39f97996fc8fc2f810c42dd1fb56aa2c3becbaceff743166a074061c016e3d01"},"schema_version":"1.0"},"canonical_sha256":"d538fb326af6d920e7816cb5e5c93a5f5f3ff1c44b7e411d3f53f698b47a0194","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:02:56.124265Z","signature_b64":"tB726S1nGXlqITNAPS2AZjF9e31+ltH9svY9WLdI58n67iNlSwCcCzpCrU8Pnv3+DObedbDqsSVchVSf617TBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d538fb326af6d920e7816cb5e5c93a5f5f3ff1c44b7e411d3f53f698b47a0194","last_reissued_at":"2026-05-18T02:02:56.123537Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:02:56.123537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1103.1671","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:02:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2lZRSYPRCfFxPhe5/prm44EhCgth+eO9MixdhC/yAikbrInwxe5fvOU197oAZx9GtcXkLCBaMK6rEdjfojejAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T09:40:26.292075Z"},"content_sha256":"304ddba5da3c4566d789e4a28ceeeedb979e66ec5333e9993bf32ff7d5e2e549","schema_version":"1.0","event_id":"sha256:304ddba5da3c4566d789e4a28ceeeedb979e66ec5333e9993bf32ff7d5e2e549"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:2U4PWMTK63MSBZ4BNS26LSJ2L5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Study of Carbon Features in Type Ia Supernova Spectra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Dan Milisavljevic, G. H. Marion, J. Craig Wheeler, Jerod T. Parrent, J\\`ozsef Vink\\`o, Peter Challis, Peter M. Garnavich, R. C. Thomas, Robert A. Fesen","submitted_at":"2011-03-09T00:18:31Z","abstract_excerpt":"One of the major differences between various explosion scenarios of Type Ia supernovae (SNe Ia) is the remaining amount of unburned (C+O) material and its velocity distribution within the expanding ejecta. While oxygen absorption features are not uncommon in the spectra of SNe Ia before maximum light, the presence of strong carbon absorption has been reported only in a minority of objects, typically during the pre-maximum phase. The reported low frequency of carbon detections may be due to low signal-to-noise data, low abundance of unburned material, line blending between C II 6580 and Si II 6"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.1671","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:02:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ps0H5jL9B+RNv4YDEBFWRu17PsaPhPkFTbGsBZl3wSdA4MfKplXbZgocO2qoBrtc/XGZTrSthlA7M+xQVXzUDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T09:40:26.292734Z"},"content_sha256":"ccff0f49da99e20db3227caa060c3a833ebe299af98f1ab0a67fc18927ff270a","schema_version":"1.0","event_id":"sha256:ccff0f49da99e20db3227caa060c3a833ebe299af98f1ab0a67fc18927ff270a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2U4PWMTK63MSBZ4BNS26LSJ2L5/bundle.json","state_url":"https://pith.science/pith/2U4PWMTK63MSBZ4BNS26LSJ2L5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2U4PWMTK63MSBZ4BNS26LSJ2L5/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":"2026-05-26T09:40:26Z","links":{"resolver":"https://pith.science/pith/2U4PWMTK63MSBZ4BNS26LSJ2L5","bundle":"https://pith.science/pith/2U4PWMTK63MSBZ4BNS26LSJ2L5/bundle.json","state":"https://pith.science/pith/2U4PWMTK63MSBZ4BNS26LSJ2L5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2U4PWMTK63MSBZ4BNS26LSJ2L5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:2U4PWMTK63MSBZ4BNS26LSJ2L5","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":"39f97996fc8fc2f810c42dd1fb56aa2c3becbaceff743166a074061c016e3d01","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-09T00:18:31Z","title_canon_sha256":"e8a0eda99394fec024b0416ef5ae14e8c9e137056a061e1b00a1ff676545e9d7"},"schema_version":"1.0","source":{"id":"1103.1671","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.1671","created_at":"2026-05-18T02:02:56Z"},{"alias_kind":"arxiv_version","alias_value":"1103.1671v1","created_at":"2026-05-18T02:02:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.1671","created_at":"2026-05-18T02:02:56Z"},{"alias_kind":"pith_short_12","alias_value":"2U4PWMTK63MS","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"2U4PWMTK63MSBZ4B","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"2U4PWMTK","created_at":"2026-05-18T12:26:18Z"}],"graph_snapshots":[{"event_id":"sha256:ccff0f49da99e20db3227caa060c3a833ebe299af98f1ab0a67fc18927ff270a","target":"graph","created_at":"2026-05-18T02:02:56Z","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":"One of the major differences between various explosion scenarios of Type Ia supernovae (SNe Ia) is the remaining amount of unburned (C+O) material and its velocity distribution within the expanding ejecta. While oxygen absorption features are not uncommon in the spectra of SNe Ia before maximum light, the presence of strong carbon absorption has been reported only in a minority of objects, typically during the pre-maximum phase. The reported low frequency of carbon detections may be due to low signal-to-noise data, low abundance of unburned material, line blending between C II 6580 and Si II 6","authors_text":"Dan Milisavljevic, G. H. Marion, J. Craig Wheeler, Jerod T. Parrent, J\\`ozsef Vink\\`o, Peter Challis, Peter M. Garnavich, R. C. Thomas, Robert A. Fesen","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-09T00:18:31Z","title":"A Study of Carbon Features in Type Ia Supernova Spectra"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.1671","kind":"arxiv","version":1},"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":"sha256:304ddba5da3c4566d789e4a28ceeeedb979e66ec5333e9993bf32ff7d5e2e549","target":"record","created_at":"2026-05-18T02:02:56Z","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":"39f97996fc8fc2f810c42dd1fb56aa2c3becbaceff743166a074061c016e3d01","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-09T00:18:31Z","title_canon_sha256":"e8a0eda99394fec024b0416ef5ae14e8c9e137056a061e1b00a1ff676545e9d7"},"schema_version":"1.0","source":{"id":"1103.1671","kind":"arxiv","version":1}},"canonical_sha256":"d538fb326af6d920e7816cb5e5c93a5f5f3ff1c44b7e411d3f53f698b47a0194","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d538fb326af6d920e7816cb5e5c93a5f5f3ff1c44b7e411d3f53f698b47a0194","first_computed_at":"2026-05-18T02:02:56.123537Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:02:56.123537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tB726S1nGXlqITNAPS2AZjF9e31+ltH9svY9WLdI58n67iNlSwCcCzpCrU8Pnv3+DObedbDqsSVchVSf617TBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:02:56.124265Z","signed_message":"canonical_sha256_bytes"},"source_id":"1103.1671","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:304ddba5da3c4566d789e4a28ceeeedb979e66ec5333e9993bf32ff7d5e2e549","sha256:ccff0f49da99e20db3227caa060c3a833ebe299af98f1ab0a67fc18927ff270a"],"state_sha256":"d68f64805d9aa073ead1d7ec306fbe73442e7b113e320cb65f8cae3b58893191"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9ydACOMgoI6kqjiyKlE5FAZxsvWWwVAt9AiVK4EbkIj3QXGvO9ohHo6644BmF3IO2HlrrB1i45aBJJvDNhPxAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T09:40:26.296745Z","bundle_sha256":"769d654e039ed276f71441fd5d1182f290a1402c77d69ee5317db0a6e9221aaa"}}