{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:QNH73WO7VM5W4YJ7QGDOJRLIEY","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":"8392ec0d6c488a7edfb7dd6b3daa51caf3aa6dd1df60763da879af9681b3f1fc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-04-19T14:44:34Z","title_canon_sha256":"4e8d9110b905570c7cc177aba573def53b66e276bfdada1bc5136ee2e3da72a9"},"schema_version":"1.0","source":{"id":"1604.05602","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.05602","created_at":"2026-05-18T00:47:14Z"},{"alias_kind":"arxiv_version","alias_value":"1604.05602v2","created_at":"2026-05-18T00:47:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.05602","created_at":"2026-05-18T00:47:14Z"},{"alias_kind":"pith_short_12","alias_value":"QNH73WO7VM5W","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_16","alias_value":"QNH73WO7VM5W4YJ7","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_8","alias_value":"QNH73WO7","created_at":"2026-05-18T12:30:39Z"}],"graph_snapshots":[{"event_id":"sha256:2ceada4b59e119e413502eb913b260c113f1cd43cb67b2a2375fd78ddafb85aa","target":"graph","created_at":"2026-05-18T00:47:14Z","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":"Ammonia and its deuterated isotopologues probe physical conditions in dense molecular cloud cores. With the aim of testing the current understanding of the spin-state chemistry of these molecules, we observed spectral lines of NH3, NH2D, NHD2, ND3, and N2D+ towards a dense, starless core in Ophiuchus with the APEX, GBT, and IRAM 30-m telescopes. The observations were interpreted using a gas-grain chemistry model combined with radiative transfer calculations. The chemistry model distinguishes between the different nuclear spin states of light hydrogen molecules, ammonia, and their deuterated fo","authors_text":"Alexandre Faure, Anna Punanova, Claire Rist, Erik Rosolowsky, Fabien Daniel, Jaime E. Pineda, Jorma Harju, Laurent Wiesenfeld, Olli Sipil\\\"a, Paola Caselli, Philip C. Myers, Pierre Hily-Blant, Rachel K. Friesen, Rolf G\\\"usten, Stephan Schlemmer, Yancy L. Shirley","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-04-19T14:44:34Z","title":"Deuteration of ammonia in the starless core Ophiuchus/H-MM1"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.05602","kind":"arxiv","version":2},"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":"sha256:7eb030fdbeaadddf6af6866c2007b81ba7fc3d1612fd102fb25603d38c077395","target":"record","created_at":"2026-05-18T00:47:14Z","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":"8392ec0d6c488a7edfb7dd6b3daa51caf3aa6dd1df60763da879af9681b3f1fc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-04-19T14:44:34Z","title_canon_sha256":"4e8d9110b905570c7cc177aba573def53b66e276bfdada1bc5136ee2e3da72a9"},"schema_version":"1.0","source":{"id":"1604.05602","kind":"arxiv","version":2}},"canonical_sha256":"834ffdd9dfab3b6e613f8186e4c5682620f439b07bf569f412f3d1c97905d3e7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"834ffdd9dfab3b6e613f8186e4c5682620f439b07bf569f412f3d1c97905d3e7","first_computed_at":"2026-05-18T00:47:14.981491Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:47:14.981491Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PQ8wZSAFGVmXng4Xon9oYaikpr/30kdoQUxVu8dY0gf7ZZ82E3e07pZXlJlT339B+Nh0lj+GXbi6uSiLKl1SCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:47:14.982232Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.05602","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7eb030fdbeaadddf6af6866c2007b81ba7fc3d1612fd102fb25603d38c077395","sha256:2ceada4b59e119e413502eb913b260c113f1cd43cb67b2a2375fd78ddafb85aa"],"state_sha256":"7d7d1dbd51f3de552e5f90de1380075055e269f9d97aa044bc95a064c7c3e060"}