{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:G7S4OKSOLIC3ASS5LVV6OT3VDN","short_pith_number":"pith:G7S4OKSO","canonical_record":{"source":{"id":"1810.06788","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-16T01:59:01Z","cross_cats_sorted":[],"title_canon_sha256":"2d20361c7fba39fc3c9c01ad07d038c73c9af03e36e378c38ad065a3945cd11d","abstract_canon_sha256":"c5dd92bbf77ccf91d3910621c60956edf9c0f124a40fe4c33f1e728f8ecba594"},"schema_version":"1.0"},"canonical_sha256":"37e5c72a4e5a05b04a5d5d6be74f751b6556d422b959e9219bdccb984a92d26c","source":{"kind":"arxiv","id":"1810.06788","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.06788","created_at":"2026-05-17T23:59:14Z"},{"alias_kind":"arxiv_version","alias_value":"1810.06788v2","created_at":"2026-05-17T23:59:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.06788","created_at":"2026-05-17T23:59:14Z"},{"alias_kind":"pith_short_12","alias_value":"G7S4OKSOLIC3","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"G7S4OKSOLIC3ASS5","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"G7S4OKSO","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:G7S4OKSOLIC3ASS5LVV6OT3VDN","target":"record","payload":{"canonical_record":{"source":{"id":"1810.06788","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-16T01:59:01Z","cross_cats_sorted":[],"title_canon_sha256":"2d20361c7fba39fc3c9c01ad07d038c73c9af03e36e378c38ad065a3945cd11d","abstract_canon_sha256":"c5dd92bbf77ccf91d3910621c60956edf9c0f124a40fe4c33f1e728f8ecba594"},"schema_version":"1.0"},"canonical_sha256":"37e5c72a4e5a05b04a5d5d6be74f751b6556d422b959e9219bdccb984a92d26c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:14.000789Z","signature_b64":"qmDJiiRoJ4D/m3IcIjV2aRr5RLLyq1x/ffUct0tZxsWIdnxXdL/lT0oM4kdNfTUGN9b1g1asJVuHKTU6I5/WBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"37e5c72a4e5a05b04a5d5d6be74f751b6556d422b959e9219bdccb984a92d26c","last_reissued_at":"2026-05-17T23:59:13.999997Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:13.999997Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.06788","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":"2026-05-17T23:59:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3g6Y159s5SBV04zuZfWb50tOBh0Qx4NTEQul9h37rYAjzbtZmrSIPux0mQ4GktIMSJi0dF4g3/UEgsAnhrXRDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T20:30:33.610147Z"},"content_sha256":"69d88d9cf9b6c71973c13babf84535a1b3a0e9e61dd63e6e35194a5ad8adfd31","schema_version":"1.0","event_id":"sha256:69d88d9cf9b6c71973c13babf84535a1b3a0e9e61dd63e6e35194a5ad8adfd31"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:G7S4OKSOLIC3ASS5LVV6OT3VDN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Narrow Transient Absorptions in Late-Time Optical Spectra of Type Ia Supernovae: Evidence for Large Clumps of Iron-Rich Ejecta?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Christine S. Black, Jerod T. Parrent, Robert A. Fesen","submitted_at":"2018-10-16T01:59:01Z","abstract_excerpt":"An examination of late-time, optical spectra of type Ia supernovae revealed surprisingly narrow absorption features which only become visible a few months after maximum light. These features, most clearly seen in the late-time spectra of the bright, recent type Ia supernovae ASASSN-14lp and SN 2017bzc, appear as narrow absorptions at ~4840 A, ~5000 A, and as a sharp inflection at ~4760 A on the red side of the prominent late-time 4700 A feature. A survey of on-line archival data revealed similar features present in the spectra of ten other normal and 91T-like SNe Ia, including SN 2011fe. Unlik"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.06788","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":"2026-05-17T23:59:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rTpc2Ek+OpkBBr6v3tB3eJrtOM5ofRvlWXbTGPkPGO5yYCYxhWa8ui9QfI/1EJbkfPTz04d1uzrzlkr02kIbAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T20:30:33.610872Z"},"content_sha256":"c2bd65d71940579706c9595d18246a68c675c839f900cc50fcbb854ac3dfe910","schema_version":"1.0","event_id":"sha256:c2bd65d71940579706c9595d18246a68c675c839f900cc50fcbb854ac3dfe910"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G7S4OKSOLIC3ASS5LVV6OT3VDN/bundle.json","state_url":"https://pith.science/pith/G7S4OKSOLIC3ASS5LVV6OT3VDN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G7S4OKSOLIC3ASS5LVV6OT3VDN/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":"2026-06-05T20:30:33Z","links":{"resolver":"https://pith.science/pith/G7S4OKSOLIC3ASS5LVV6OT3VDN","bundle":"https://pith.science/pith/G7S4OKSOLIC3ASS5LVV6OT3VDN/bundle.json","state":"https://pith.science/pith/G7S4OKSOLIC3ASS5LVV6OT3VDN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G7S4OKSOLIC3ASS5LVV6OT3VDN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:G7S4OKSOLIC3ASS5LVV6OT3VDN","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":"c5dd92bbf77ccf91d3910621c60956edf9c0f124a40fe4c33f1e728f8ecba594","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-16T01:59:01Z","title_canon_sha256":"2d20361c7fba39fc3c9c01ad07d038c73c9af03e36e378c38ad065a3945cd11d"},"schema_version":"1.0","source":{"id":"1810.06788","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.06788","created_at":"2026-05-17T23:59:14Z"},{"alias_kind":"arxiv_version","alias_value":"1810.06788v2","created_at":"2026-05-17T23:59:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.06788","created_at":"2026-05-17T23:59:14Z"},{"alias_kind":"pith_short_12","alias_value":"G7S4OKSOLIC3","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"G7S4OKSOLIC3ASS5","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"G7S4OKSO","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:c2bd65d71940579706c9595d18246a68c675c839f900cc50fcbb854ac3dfe910","target":"graph","created_at":"2026-05-17T23:59:14Z","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":"An examination of late-time, optical spectra of type Ia supernovae revealed surprisingly narrow absorption features which only become visible a few months after maximum light. These features, most clearly seen in the late-time spectra of the bright, recent type Ia supernovae ASASSN-14lp and SN 2017bzc, appear as narrow absorptions at ~4840 A, ~5000 A, and as a sharp inflection at ~4760 A on the red side of the prominent late-time 4700 A feature. A survey of on-line archival data revealed similar features present in the spectra of ten other normal and 91T-like SNe Ia, including SN 2011fe. Unlik","authors_text":"Christine S. Black, Jerod T. Parrent, Robert A. Fesen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-16T01:59:01Z","title":"Narrow Transient Absorptions in Late-Time Optical Spectra of Type Ia Supernovae: Evidence for Large Clumps of Iron-Rich Ejecta?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.06788","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":"sha256:69d88d9cf9b6c71973c13babf84535a1b3a0e9e61dd63e6e35194a5ad8adfd31","target":"record","created_at":"2026-05-17T23:59:14Z","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":"c5dd92bbf77ccf91d3910621c60956edf9c0f124a40fe4c33f1e728f8ecba594","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-16T01:59:01Z","title_canon_sha256":"2d20361c7fba39fc3c9c01ad07d038c73c9af03e36e378c38ad065a3945cd11d"},"schema_version":"1.0","source":{"id":"1810.06788","kind":"arxiv","version":2}},"canonical_sha256":"37e5c72a4e5a05b04a5d5d6be74f751b6556d422b959e9219bdccb984a92d26c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"37e5c72a4e5a05b04a5d5d6be74f751b6556d422b959e9219bdccb984a92d26c","first_computed_at":"2026-05-17T23:59:13.999997Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:13.999997Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qmDJiiRoJ4D/m3IcIjV2aRr5RLLyq1x/ffUct0tZxsWIdnxXdL/lT0oM4kdNfTUGN9b1g1asJVuHKTU6I5/WBw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:14.000789Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.06788","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:69d88d9cf9b6c71973c13babf84535a1b3a0e9e61dd63e6e35194a5ad8adfd31","sha256:c2bd65d71940579706c9595d18246a68c675c839f900cc50fcbb854ac3dfe910"],"state_sha256":"7765ca0b8f1dedc1ca892beeffc20f60b1fc540999c1a5919950ff99846e3feb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ryntDsZherY/Hl7W5XGgTTYwlRKRv3vGqycRRmkY4AunDR5RmCoaFCgHuehQdayg3AAn+4I7ItXPYtSbYukRDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T20:30:33.616126Z","bundle_sha256":"b1ea98ba843d33c3fa7e2860ea677869823faeb9717433e1724c9a467246b46e"}}