{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:JWWCUTMXNXBSBU57BTPSPJICOJ","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":"2b40a56c9246fbe2770dd0d074a860c2dce12cc10ccb40a6ab99afd76595f0f1","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-01-24T18:23:39Z","title_canon_sha256":"d9fe5b2106b566e90df9a860b922e9239faddf491f014f65cf98f5e821397777"},"schema_version":"1.0","source":{"id":"astro-ph/0701700","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0701700","created_at":"2026-05-18T01:09:21Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0701700v1","created_at":"2026-05-18T01:09:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0701700","created_at":"2026-05-18T01:09:21Z"},{"alias_kind":"pith_short_12","alias_value":"JWWCUTMXNXBS","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"JWWCUTMXNXBSBU57","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"JWWCUTMX","created_at":"2026-05-18T12:25:55Z"}],"graph_snapshots":[{"event_id":"sha256:75d65ec27477c8f60cab16fa110fd12568eaed73692ef06eab6d029bf660d191","target":"graph","created_at":"2026-05-18T01:09:21Z","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"},"paper":{"abstract_excerpt":"Deuterium fractionation is known to enhance the [DCO+]/[HCO+] abundance ratio over the D/H elemental ratio of about 1e-5 in the cold and dense gas typically found in pre-stellar cores. We report the first detection and mapping of very bright DCO+ J=3-2 and J=2-1 lines (3 and 4 K respectively) towards the Horsehead photodissociation region (PDR) observed with the IRAM-30m telescope. The DCO+ emission peaks close to the illuminated warm edge of the nebula (< 50\" or about 0.1 pc away). Detailed nonlocal, non-LTE excitation and radiative transfer analyses have been used to determine the prevailing","authors_text":"David Teyssier (ESAC), Javier R. Goicoechea (LERMA), J\\'er\\^ome Pety (IRAM, LERMA), Maryvonne Gerin (LERMA), Pierre Hily-Blant (IRAM)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-01-24T18:23:39Z","title":"Deuterium fractionation in the Horsehead edge"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0701700","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:c7aced0ab8042c238b73e015138cf195314d4725af1e0a473bb169d5aa0c4698","target":"record","created_at":"2026-05-18T01:09:21Z","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":"2b40a56c9246fbe2770dd0d074a860c2dce12cc10ccb40a6ab99afd76595f0f1","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-01-24T18:23:39Z","title_canon_sha256":"d9fe5b2106b566e90df9a860b922e9239faddf491f014f65cf98f5e821397777"},"schema_version":"1.0","source":{"id":"astro-ph/0701700","kind":"arxiv","version":1}},"canonical_sha256":"4dac2a4d976dc320d3bf0cdf27a50272613cfd22f356e2f5b02feabc23967707","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4dac2a4d976dc320d3bf0cdf27a50272613cfd22f356e2f5b02feabc23967707","first_computed_at":"2026-05-18T01:09:21.717235Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:09:21.717235Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RnoYArAPU+z2sPLWwPHKTcrY8xTdHu/P1OE3YQU2Lb87PKNRzBiDehfHkHwuwtFZTwPWA7MXTzy8kd+TJtfeCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:09:21.717760Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0701700","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c7aced0ab8042c238b73e015138cf195314d4725af1e0a473bb169d5aa0c4698","sha256:75d65ec27477c8f60cab16fa110fd12568eaed73692ef06eab6d029bf660d191"],"state_sha256":"bf55c7d2dbb9df535454133b860c4ba2d4a6b6aa75c1a4ed1a8987515b67fd07"}