{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:YP3XCHPD7AZWZHT73GGOTNSFO6","short_pith_number":"pith:YP3XCHPD","canonical_record":{"source":{"id":"1509.00336","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-09-01T15:05:02Z","cross_cats_sorted":[],"title_canon_sha256":"bae05ffc64fb85a96a53a17f3e298e893b05f2a4f8e21431151ba267fcc2915d","abstract_canon_sha256":"38811a170c82b0b2fac133c19bbbb686c1dbdf83bda74580c1c10eeee2d1f06e"},"schema_version":"1.0"},"canonical_sha256":"c3f7711de3f8336c9e7fd98ce9b64577af987b621611ffc8aecc16e4d7a52a14","source":{"kind":"arxiv","id":"1509.00336","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.00336","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"arxiv_version","alias_value":"1509.00336v1","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.00336","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"pith_short_12","alias_value":"YP3XCHPD7AZW","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"YP3XCHPD7AZWZHT7","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"YP3XCHPD","created_at":"2026-05-18T12:29:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:YP3XCHPD7AZWZHT73GGOTNSFO6","target":"record","payload":{"canonical_record":{"source":{"id":"1509.00336","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-09-01T15:05:02Z","cross_cats_sorted":[],"title_canon_sha256":"bae05ffc64fb85a96a53a17f3e298e893b05f2a4f8e21431151ba267fcc2915d","abstract_canon_sha256":"38811a170c82b0b2fac133c19bbbb686c1dbdf83bda74580c1c10eeee2d1f06e"},"schema_version":"1.0"},"canonical_sha256":"c3f7711de3f8336c9e7fd98ce9b64577af987b621611ffc8aecc16e4d7a52a14","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:33:41.689925Z","signature_b64":"75G7hIlAQJdxF3kSngi5a08IrIPSg7axL/USr1WpRBVP6CCvNwu+YsES6u1jjezqVofrrzam3f5xrT6PP+btBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c3f7711de3f8336c9e7fd98ce9b64577af987b621611ffc8aecc16e4d7a52a14","last_reissued_at":"2026-05-18T01:33:41.689331Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:33:41.689331Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.00336","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":"2026-05-18T01:33:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wpw+ZcqzOEYV/kDXrsbfWG7gi5rXhPDIuaZCT+klSt4XxFWX2CoOELHwgHxxeHhbfDtFXnv8PmJsc4UQVY5eCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T13:58:37.742438Z"},"content_sha256":"4a8db1db0dd90169e3b7b3757ae35b758056a929c2482b41bf915c5fb2c7a094","schema_version":"1.0","event_id":"sha256:4a8db1db0dd90169e3b7b3757ae35b758056a929c2482b41bf915c5fb2c7a094"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:YP3XCHPD7AZWZHT73GGOTNSFO6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A proposed chemical scheme for HCCO formation in cold dense clouds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"J.-C. Loison, K. M. Hickson, M. Ruaud, V. Wakelam","submitted_at":"2015-09-01T15:05:02Z","abstract_excerpt":"The ketenyl radical (HCCO) has recently been discovered in two cold dense clouds with a non-negligible abundance of a few 1e-11 (compared to H2) (Agundez et al. 2015). Until now, no chemical network has been able to reproduce this observation. We propose here a chemical scheme that can reproduce HCCO abundances together with HCO, H2CCO and CH3CHO in the dark clouds Lupus-1A and L486. The main formation pathway for HCCO is the OH + CCH -> HCCO + H reaction as suggested by Agundez et al. (2015) but with a much larger rate coefficient than used in current models. Since this reaction has never bee"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.00336","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":"2026-05-18T01:33:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D8aW7+KpQOaGqtBGTQuOirrTu9LKKCBFswGuUFeJ9uU+boqUxxK+GKGgAK5NaxyCzYxWJ16H0unbbZOL1edfCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T13:58:37.742795Z"},"content_sha256":"c195eb08fc05d6ba820e5715a87e699bcb97f214e54be85efae817c2d245f062","schema_version":"1.0","event_id":"sha256:c195eb08fc05d6ba820e5715a87e699bcb97f214e54be85efae817c2d245f062"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YP3XCHPD7AZWZHT73GGOTNSFO6/bundle.json","state_url":"https://pith.science/pith/YP3XCHPD7AZWZHT73GGOTNSFO6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YP3XCHPD7AZWZHT73GGOTNSFO6/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":"2026-05-30T13:58:37Z","links":{"resolver":"https://pith.science/pith/YP3XCHPD7AZWZHT73GGOTNSFO6","bundle":"https://pith.science/pith/YP3XCHPD7AZWZHT73GGOTNSFO6/bundle.json","state":"https://pith.science/pith/YP3XCHPD7AZWZHT73GGOTNSFO6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YP3XCHPD7AZWZHT73GGOTNSFO6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:YP3XCHPD7AZWZHT73GGOTNSFO6","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":"38811a170c82b0b2fac133c19bbbb686c1dbdf83bda74580c1c10eeee2d1f06e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-09-01T15:05:02Z","title_canon_sha256":"bae05ffc64fb85a96a53a17f3e298e893b05f2a4f8e21431151ba267fcc2915d"},"schema_version":"1.0","source":{"id":"1509.00336","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.00336","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"arxiv_version","alias_value":"1509.00336v1","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.00336","created_at":"2026-05-18T01:33:41Z"},{"alias_kind":"pith_short_12","alias_value":"YP3XCHPD7AZW","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"YP3XCHPD7AZWZHT7","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"YP3XCHPD","created_at":"2026-05-18T12:29:50Z"}],"graph_snapshots":[{"event_id":"sha256:c195eb08fc05d6ba820e5715a87e699bcb97f214e54be85efae817c2d245f062","target":"graph","created_at":"2026-05-18T01:33:41Z","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":"The ketenyl radical (HCCO) has recently been discovered in two cold dense clouds with a non-negligible abundance of a few 1e-11 (compared to H2) (Agundez et al. 2015). Until now, no chemical network has been able to reproduce this observation. We propose here a chemical scheme that can reproduce HCCO abundances together with HCO, H2CCO and CH3CHO in the dark clouds Lupus-1A and L486. The main formation pathway for HCCO is the OH + CCH -> HCCO + H reaction as suggested by Agundez et al. (2015) but with a much larger rate coefficient than used in current models. Since this reaction has never bee","authors_text":"J.-C. Loison, K. M. Hickson, M. Ruaud, V. Wakelam","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-09-01T15:05:02Z","title":"A proposed chemical scheme for HCCO formation in cold dense clouds"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.00336","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":"sha256:4a8db1db0dd90169e3b7b3757ae35b758056a929c2482b41bf915c5fb2c7a094","target":"record","created_at":"2026-05-18T01:33:41Z","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":"38811a170c82b0b2fac133c19bbbb686c1dbdf83bda74580c1c10eeee2d1f06e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-09-01T15:05:02Z","title_canon_sha256":"bae05ffc64fb85a96a53a17f3e298e893b05f2a4f8e21431151ba267fcc2915d"},"schema_version":"1.0","source":{"id":"1509.00336","kind":"arxiv","version":1}},"canonical_sha256":"c3f7711de3f8336c9e7fd98ce9b64577af987b621611ffc8aecc16e4d7a52a14","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c3f7711de3f8336c9e7fd98ce9b64577af987b621611ffc8aecc16e4d7a52a14","first_computed_at":"2026-05-18T01:33:41.689331Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:33:41.689331Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"75G7hIlAQJdxF3kSngi5a08IrIPSg7axL/USr1WpRBVP6CCvNwu+YsES6u1jjezqVofrrzam3f5xrT6PP+btBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:33:41.689925Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.00336","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4a8db1db0dd90169e3b7b3757ae35b758056a929c2482b41bf915c5fb2c7a094","sha256:c195eb08fc05d6ba820e5715a87e699bcb97f214e54be85efae817c2d245f062"],"state_sha256":"89ff38f597d00147df42746074db9933fb1db9a1d951258d3acb27755abf9764"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EwiG7z+iiPson8cJ4+mbvH/8z22WoU174S1zDMAzcaV2/P8R4ftm8/mNRQWMQjQnbvLmXZ8N8f3S6heQPTfmBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T13:58:37.745076Z","bundle_sha256":"c5aebd1303fe4cae81c0180c44211da4284b2edffd6a436c9e2eeb891f296691"}}