{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:UPSLZCECS6EXMNFN6WHDRZ4NJH","short_pith_number":"pith:UPSLZCEC","canonical_record":{"source":{"id":"1910.01554","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-10-03T15:35:01Z","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"title_canon_sha256":"3aac84d9b81cab5c3488957a6a040d6ecea87611dd73a08f6c4e1bdcf823ab7c","abstract_canon_sha256":"c56b4962eb9f7699d6ab8d3a595c34c113972ecb41663ebd4b8dba35bbe5bc38"},"schema_version":"1.0"},"canonical_sha256":"a3e4bc888297897634adf58e38e78d49eeff547367dc21c9f03e616324e98b85","source":{"kind":"arxiv","id":"1910.01554","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1910.01554","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"arxiv_version","alias_value":"1910.01554v1","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.01554","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"pith_short_12","alias_value":"UPSLZCECS6EX","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"pith_short_16","alias_value":"UPSLZCECS6EXMNFN","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"pith_short_8","alias_value":"UPSLZCEC","created_at":"2026-07-05T00:31:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:UPSLZCECS6EXMNFN6WHDRZ4NJH","target":"record","payload":{"canonical_record":{"source":{"id":"1910.01554","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-10-03T15:35:01Z","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"title_canon_sha256":"3aac84d9b81cab5c3488957a6a040d6ecea87611dd73a08f6c4e1bdcf823ab7c","abstract_canon_sha256":"c56b4962eb9f7699d6ab8d3a595c34c113972ecb41663ebd4b8dba35bbe5bc38"},"schema_version":"1.0"},"canonical_sha256":"a3e4bc888297897634adf58e38e78d49eeff547367dc21c9f03e616324e98b85","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:31:21.891735Z","signature_b64":"sJj+QfG/Kiv+Yyytysfep2eBKr85XI8tncU7IdGtVHG/Ry/vFdQYs8EhMy4jCEfwCb8DPaMcoZwTX3FcilTGCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a3e4bc888297897634adf58e38e78d49eeff547367dc21c9f03e616324e98b85","last_reissued_at":"2026-07-05T00:31:21.891235Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:31:21.891235Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1910.01554","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":"2026-07-05T00:31:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/DehDxU0J0OFhUil4NaB/1kfAms7QMqmUBr6aNmq8PQQ9QjC08isQ5aK5TaHaBQnUQZuGs8cchu67xy+hbp/DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T18:57:40.426562Z"},"content_sha256":"88b61946601cd0173a8b5e3449e9e281837d12ea307cd6795696978c077c737a","schema_version":"1.0","event_id":"sha256:88b61946601cd0173a8b5e3449e9e281837d12ea307cd6795696978c077c737a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:UPSLZCECS6EXMNFN6WHDRZ4NJH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The role of C/O in nitrile astrochemistry in PDRs and planet-forming disks","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Evelyne Roueff, Franck Le Petit, Karin I. \\\"Oberg, Madison T. Brady, Romane Le Gal","submitted_at":"2019-10-03T15:35:01Z","abstract_excerpt":"Complex nitriles, such as HC3N, and CH3CN, are observed in a wide variety of astrophysical environments, including at relatively high abundances in photon-dominated regions (PDR) and the UV exposed atmospheres of planet-forming disks. The latter have been inferred to be oxygen-poor, suggesting that these observations may be explained by organic chemistry in C-rich environments. In this study we first explore if the PDR complex nitrile observations can be explained by gas-phase PDR chemistry alone if the elemental C/O ratio is elevated. In the case of the Horsehead PDR, we find that gas-phase c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.01554","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1910.01554/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:31:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SKmLylZS1ITqlcOe+G/NASSAdPkf1tVoZuaT/E8Hh1JyEvo9e0AtLOxYhHEr2D2i+qz+6jnMqB+/iwBmBJzJAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T18:57:40.427095Z"},"content_sha256":"6d2f87442f1aeff545cacbbddd38d5d942aa3fb88d2206dd623d059e9072b946","schema_version":"1.0","event_id":"sha256:6d2f87442f1aeff545cacbbddd38d5d942aa3fb88d2206dd623d059e9072b946"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UPSLZCECS6EXMNFN6WHDRZ4NJH/bundle.json","state_url":"https://pith.science/pith/UPSLZCECS6EXMNFN6WHDRZ4NJH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UPSLZCECS6EXMNFN6WHDRZ4NJH/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":"2026-08-11T18:57:40Z","links":{"resolver":"https://pith.science/pith/UPSLZCECS6EXMNFN6WHDRZ4NJH","bundle":"https://pith.science/pith/UPSLZCECS6EXMNFN6WHDRZ4NJH/bundle.json","state":"https://pith.science/pith/UPSLZCECS6EXMNFN6WHDRZ4NJH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UPSLZCECS6EXMNFN6WHDRZ4NJH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:UPSLZCECS6EXMNFN6WHDRZ4NJH","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":"c56b4962eb9f7699d6ab8d3a595c34c113972ecb41663ebd4b8dba35bbe5bc38","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-10-03T15:35:01Z","title_canon_sha256":"3aac84d9b81cab5c3488957a6a040d6ecea87611dd73a08f6c4e1bdcf823ab7c"},"schema_version":"1.0","source":{"id":"1910.01554","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1910.01554","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"arxiv_version","alias_value":"1910.01554v1","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.01554","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"pith_short_12","alias_value":"UPSLZCECS6EX","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"pith_short_16","alias_value":"UPSLZCECS6EXMNFN","created_at":"2026-07-05T00:31:21Z"},{"alias_kind":"pith_short_8","alias_value":"UPSLZCEC","created_at":"2026-07-05T00:31:21Z"}],"graph_snapshots":[{"event_id":"sha256:6d2f87442f1aeff545cacbbddd38d5d942aa3fb88d2206dd623d059e9072b946","target":"graph","created_at":"2026-07-05T00:31:21Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1910.01554/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Complex nitriles, such as HC3N, and CH3CN, are observed in a wide variety of astrophysical environments, including at relatively high abundances in photon-dominated regions (PDR) and the UV exposed atmospheres of planet-forming disks. The latter have been inferred to be oxygen-poor, suggesting that these observations may be explained by organic chemistry in C-rich environments. In this study we first explore if the PDR complex nitrile observations can be explained by gas-phase PDR chemistry alone if the elemental C/O ratio is elevated. In the case of the Horsehead PDR, we find that gas-phase c","authors_text":"Evelyne Roueff, Franck Le Petit, Karin I. \\\"Oberg, Madison T. Brady, Romane Le Gal","cross_cats":["astro-ph.GA","astro-ph.SR"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-10-03T15:35:01Z","title":"The role of C/O in nitrile astrochemistry in PDRs and planet-forming disks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.01554","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":"sha256:88b61946601cd0173a8b5e3449e9e281837d12ea307cd6795696978c077c737a","target":"record","created_at":"2026-07-05T00:31:21Z","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":"c56b4962eb9f7699d6ab8d3a595c34c113972ecb41663ebd4b8dba35bbe5bc38","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-10-03T15:35:01Z","title_canon_sha256":"3aac84d9b81cab5c3488957a6a040d6ecea87611dd73a08f6c4e1bdcf823ab7c"},"schema_version":"1.0","source":{"id":"1910.01554","kind":"arxiv","version":1}},"canonical_sha256":"a3e4bc888297897634adf58e38e78d49eeff547367dc21c9f03e616324e98b85","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a3e4bc888297897634adf58e38e78d49eeff547367dc21c9f03e616324e98b85","first_computed_at":"2026-07-05T00:31:21.891235Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:31:21.891235Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sJj+QfG/Kiv+Yyytysfep2eBKr85XI8tncU7IdGtVHG/Ry/vFdQYs8EhMy4jCEfwCb8DPaMcoZwTX3FcilTGCA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:31:21.891735Z","signed_message":"canonical_sha256_bytes"},"source_id":"1910.01554","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:88b61946601cd0173a8b5e3449e9e281837d12ea307cd6795696978c077c737a","sha256:6d2f87442f1aeff545cacbbddd38d5d942aa3fb88d2206dd623d059e9072b946"],"state_sha256":"54f2ba69abdcfc009e31a4fd2fa452757d8967d4a65ad1211b7735c680c9898f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TP3AReld02JDBMf/YeoqflK4zuQS3o2j/dCGdebvfjDgoIGl1eVqezxFa9trbLbPu8oI1EVmqfGJpcUcVCngBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T18:57:40.431532Z","bundle_sha256":"a72b80a9fb7bea4ea45e8bdc725ae3075077f4be3902cbe375ae613247824cfa"}}