{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:VI7XNQRO6X7KS2KSXV6TH4BZ5U","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":"8a414fe93bc342015ab48d85ef43c7a3f53daf75ec5c86c5c8ac50df4974ca23","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-12-05T10:43:15Z","title_canon_sha256":"a8efdfe75a4d81a74294ee905fc33e7caa4e6f0de747ba3cafc2fdf435ca6257"},"schema_version":"1.0","source":{"id":"1712.01564","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1712.01564","created_at":"2026-05-18T00:24:47Z"},{"alias_kind":"arxiv_version","alias_value":"1712.01564v1","created_at":"2026-05-18T00:24:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1712.01564","created_at":"2026-05-18T00:24:47Z"},{"alias_kind":"pith_short_12","alias_value":"VI7XNQRO6X7K","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"VI7XNQRO6X7KS2KS","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"VI7XNQRO","created_at":"2026-05-18T12:31:49Z"}],"graph_snapshots":[{"event_id":"sha256:d9da7076617390d8862716ffc8468ffaba95f4b34e96108b2a8c99923b31829b","target":"graph","created_at":"2026-05-18T00:24:47Z","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":"We present a complete census of the 14N/15N isotopic ratio in the most abundant N-bearing molecules towards the cold envelope of the protocluster OMC-2 FIR4, the best known Sun progenitor. To this scope, we analysed the unbiased spectral survey obtained with the IRAM-30m telescope at 3mm, 2mm and 1mm. We detected several lines of CN, HCN, HNC, HC3N, N2H+, and their respective 13C and 15N isotopologues. The lines relative fluxes are compatible with LTE conditions and moderate line opacities have been corrected via a Population Diagram method or theoretical relative intensity ratios of the hyper","authors_text":"Ali Jaber Al-Edhari, Ana Lopez-Sepulcre, Cecilia Ceccarelli, Claudine Kahane, Francesco Fontani, Mihkel Kama","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-12-05T10:43:15Z","title":"First measurement of the 14N/15N ratio in the analogue of the Sun progenitor OMC-2 FIR4"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.01564","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:dd2f0ac1343dd9dcccfa6a8a43d48e66c71fe965d8b686dbe6f2e7d208fe73c0","target":"record","created_at":"2026-05-18T00:24:47Z","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":"8a414fe93bc342015ab48d85ef43c7a3f53daf75ec5c86c5c8ac50df4974ca23","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-12-05T10:43:15Z","title_canon_sha256":"a8efdfe75a4d81a74294ee905fc33e7caa4e6f0de747ba3cafc2fdf435ca6257"},"schema_version":"1.0","source":{"id":"1712.01564","kind":"arxiv","version":1}},"canonical_sha256":"aa3f76c22ef5fea96952bd7d33f039ed1d0d5ee1802a855b3804da8b5e23d689","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aa3f76c22ef5fea96952bd7d33f039ed1d0d5ee1802a855b3804da8b5e23d689","first_computed_at":"2026-05-18T00:24:47.822767Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:24:47.822767Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MNZtNh5B772aUNO8jmjpmAni1iegZLAe+GZItNWugOrVXQm3MVp3zmatzZkYTcnGzFOZeZtQCQozyTpCwzRYBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:24:47.823479Z","signed_message":"canonical_sha256_bytes"},"source_id":"1712.01564","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dd2f0ac1343dd9dcccfa6a8a43d48e66c71fe965d8b686dbe6f2e7d208fe73c0","sha256:d9da7076617390d8862716ffc8468ffaba95f4b34e96108b2a8c99923b31829b"],"state_sha256":"709c2a9f9b2698d851db5a0a618e33875537b87e7b85792228e65e0820d14f26"}