{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:52ORVJU7DEWVLCCEY7TQTPIU2Y","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":"14edee261069ddf503311e5fd810e4fe6ba60a0991a4f5a73d43ca9d9b30694a","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2024-07-01T18:00:04Z","title_canon_sha256":"426751374bf40376df3d2ed39cb0b4578921fde6d62248f62048bf7366e2fd50"},"schema_version":"1.0","source":{"id":"2407.01679","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.01679","created_at":"2026-07-05T09:30:18Z"},{"alias_kind":"arxiv_version","alias_value":"2407.01679v2","created_at":"2026-07-05T09:30:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.01679","created_at":"2026-07-05T09:30:18Z"},{"alias_kind":"pith_short_12","alias_value":"52ORVJU7DEWV","created_at":"2026-07-05T09:30:18Z"},{"alias_kind":"pith_short_16","alias_value":"52ORVJU7DEWVLCCE","created_at":"2026-07-05T09:30:18Z"},{"alias_kind":"pith_short_8","alias_value":"52ORVJU7","created_at":"2026-07-05T09:30:18Z"}],"graph_snapshots":[{"event_id":"sha256:eb0d19904f3caa2850cdf9fe70ec9a5ca7e0ba4f2c748995af94a995e6ffe51b","target":"graph","created_at":"2026-07-05T09:30:18Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2407.01679/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Millimeter wavelength observations of Class II protoplanetary disks often display strong emission from hydrocarbons and high CS/SO values, providing evidence that the gas-phase C/O ratio commonly exceeds 1 in their outer regions. We present new NOEMA observations of CS $5-4$, SO $7_6-6_5$ and $5_6-4_5$, C$_2$H $N=3-2$, HCN $3-2$, HCO$^+$ $3-2$, and H$^{13}$CO$^+$ $3-2$ in the DR Tau protoplanetary disk at a resolution of $\\sim0.4''$ (80 au). Estimates for the disk-averaged CS/SO ratio range from $\\sim0.4-0.5$, the lowest value reported thus far for a T Tauri disk. At a projected separation of ","authors_text":"Edwin A. Bergin, Jaehan Bae, Jane Huang, J. A. Sturm, Luke Keyte, Romane Le Gal, Sean M. Andrews","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2024-07-01T18:00:04Z","title":"Constraints on the gas-phase C/O ratio of DR Tau's outer disk from CS, SO, and C$_2$H observations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.01679","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:a1764cda27d17de0c86ffe682675f33d11c39ff0fb6944d2dfd204cfbc9c7b3a","target":"record","created_at":"2026-07-05T09:30:18Z","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":"14edee261069ddf503311e5fd810e4fe6ba60a0991a4f5a73d43ca9d9b30694a","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2024-07-01T18:00:04Z","title_canon_sha256":"426751374bf40376df3d2ed39cb0b4578921fde6d62248f62048bf7366e2fd50"},"schema_version":"1.0","source":{"id":"2407.01679","kind":"arxiv","version":2}},"canonical_sha256":"ee9d1aa69f192d558844c7e709bd14d60c05488c09e124425967505c01fb05c2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ee9d1aa69f192d558844c7e709bd14d60c05488c09e124425967505c01fb05c2","first_computed_at":"2026-07-05T09:30:18.209537Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:30:18.209537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wm/aespixPnHpOYJtewVKoogCZ6G07PEUx6IHQlBr1k6/tKol+c9/mtnufH/VRzBV7oa2GaTd4c/FXLq0QGuAw==","signature_status":"signed_v1","signed_at":"2026-07-05T09:30:18.209966Z","signed_message":"canonical_sha256_bytes"},"source_id":"2407.01679","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a1764cda27d17de0c86ffe682675f33d11c39ff0fb6944d2dfd204cfbc9c7b3a","sha256:eb0d19904f3caa2850cdf9fe70ec9a5ca7e0ba4f2c748995af94a995e6ffe51b"],"state_sha256":"81d314e9924a32852966e34f419b2f4a3b8b531084fb0c83cae6f2d64c02f188"}