{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:BZFGUNFR5BHK2DRREGWDNMGFZB","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":"61639ee28d4577f4e4436f68f3c0ab13f55edb1f8eb568b40bdcff901c7df5bc","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-09T04:33:22Z","title_canon_sha256":"60808ccbbfb6b5fc374ae264dd2890250b7ff7fd3146891d5215adf8aff15784"},"schema_version":"1.0","source":{"id":"1705.03456","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.03456","created_at":"2026-05-18T00:42:28Z"},{"alias_kind":"arxiv_version","alias_value":"1705.03456v1","created_at":"2026-05-18T00:42:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.03456","created_at":"2026-05-18T00:42:28Z"},{"alias_kind":"pith_short_12","alias_value":"BZFGUNFR5BHK","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_16","alias_value":"BZFGUNFR5BHK2DRR","created_at":"2026-05-18T12:31:08Z"},{"alias_kind":"pith_short_8","alias_value":"BZFGUNFR","created_at":"2026-05-18T12:31:08Z"}],"graph_snapshots":[{"event_id":"sha256:5f0bafcaba507d718c5ade04053ce572348f5dd6bf71a277d214b75c6c504998","target":"graph","created_at":"2026-05-18T00:42:28Z","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 formation of deuterated molecules is favoured at low temperatures and high densities. Therefore, the deuteration fraction D$_{frac}$ is expected to be enhanced in cold, dense prestellar cores and to decrease after protostellar birth. Previous studies have shown that the deuterated forms of species such as N2H+ (formed in the gas phase) and CH3OH (formed on grain surfaces) can be used as evolutionary indicators and to constrain their dominant formation processes and time-scales. Formaldehyde (H2CO) and its deuterated forms can be produced both in the gas phase and on grain surfaces. However","authors_text":"F. Fontani, I. Jimenez-Serra, K. Immer, K. Wang, L. Testi, L. V. Toth, P. Caselli, S. Zahorecz","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-09T04:33:22Z","title":"Gas vs. solid phase deuterated chemistry: HDCO and D$_2$CO in massive star-forming regions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.03456","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:aa1fbdb7fc881425f77096ec07989c7b5d2bccb69512d32e9d11e03669005ff4","target":"record","created_at":"2026-05-18T00:42:28Z","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":"61639ee28d4577f4e4436f68f3c0ab13f55edb1f8eb568b40bdcff901c7df5bc","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-09T04:33:22Z","title_canon_sha256":"60808ccbbfb6b5fc374ae264dd2890250b7ff7fd3146891d5215adf8aff15784"},"schema_version":"1.0","source":{"id":"1705.03456","kind":"arxiv","version":1}},"canonical_sha256":"0e4a6a34b1e84ead0e3121ac36b0c5c8598a76acc5cadf49857c8fb082cc72e7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0e4a6a34b1e84ead0e3121ac36b0c5c8598a76acc5cadf49857c8fb082cc72e7","first_computed_at":"2026-05-18T00:42:28.630966Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:42:28.630966Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"d2EsIzF21fLTqRPiulcVVshDRqllQP77Xzvh/rXSKAyrV+graZ8Io3F0UDK9Yry1WLHeZbvMOcgCnQ3CIMxjAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:42:28.631615Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.03456","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aa1fbdb7fc881425f77096ec07989c7b5d2bccb69512d32e9d11e03669005ff4","sha256:5f0bafcaba507d718c5ade04053ce572348f5dd6bf71a277d214b75c6c504998"],"state_sha256":"46139874400a23d7728c6703482455f34ae6272f38363fa25dbe9ed1a19b7d93"}