{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:HNVF2EXYQ67AT7BMH2BOKVMME4","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":"c34429817acd8a962cf13fc94be0c785cacd6fabe64cb6b85c2fb8df80624f5e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-04-17T13:44:55Z","title_canon_sha256":"6538f1afbc6f2e86ad967f8ca7e99d1274e0049fd255b15ab0d1efc76ab953e3"},"schema_version":"1.0","source":{"id":"2304.08276","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.08276","created_at":"2026-07-05T07:01:40Z"},{"alias_kind":"arxiv_version","alias_value":"2304.08276v3","created_at":"2026-07-05T07:01:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.08276","created_at":"2026-07-05T07:01:40Z"},{"alias_kind":"pith_short_12","alias_value":"HNVF2EXYQ67A","created_at":"2026-07-05T07:01:40Z"},{"alias_kind":"pith_short_16","alias_value":"HNVF2EXYQ67AT7BM","created_at":"2026-07-05T07:01:40Z"},{"alias_kind":"pith_short_8","alias_value":"HNVF2EXY","created_at":"2026-07-05T07:01:40Z"}],"graph_snapshots":[{"event_id":"sha256:7a15e53a6b50490f2b8b082afa8c134581014faf9389b107ef6b2700b7251bb2","target":"graph","created_at":"2026-07-05T07:01:40Z","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/2304.08276/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Over the last few years, many studies have found an empirical relationship between the abundance of a star and its age. Here we estimate spectroscopic stellar ages for 178 825 red-giant stars observed by the APOGEE survey with a median statistical uncertainty of 17%. To this end, we use the supervised machine learning technique XGBoost, trained on a high-quality dataset of 3060 red-giant and red-clump stars with asteroseismic ages observed by both APOGEE and Kepler. After verifying the obtained age estimates with independent catalogues, we investigate some of the classical chemical, positional","authors_text":"A. B. A. Queiroz, A. Khalatyan, A. Miglio, B. Ratcliffe, C. Chiappini, F. Anders, G. Casali, H. Perottoni, I. Minchev, J. A. S. Amarante, L. Casamiquela, M. Schultheis, P. Gispert, S. Nepal, T. Antoja","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-04-17T13:44:55Z","title":"Spectroscopic age estimates for APOGEE red-giant stars: Precise spatial and kinematic trends with age in the Galactic disc"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.08276","kind":"arxiv","version":3},"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:e8d0f21b04ad79cc08d3034d11d6a94a6cdec3e84418ff91006d3ddf2fc58b6a","target":"record","created_at":"2026-07-05T07:01:40Z","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":"c34429817acd8a962cf13fc94be0c785cacd6fabe64cb6b85c2fb8df80624f5e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-04-17T13:44:55Z","title_canon_sha256":"6538f1afbc6f2e86ad967f8ca7e99d1274e0049fd255b15ab0d1efc76ab953e3"},"schema_version":"1.0","source":{"id":"2304.08276","kind":"arxiv","version":3}},"canonical_sha256":"3b6a5d12f887be09fc2c3e82e5558c272c0b6f4131f0d49461b704eab0db03b1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3b6a5d12f887be09fc2c3e82e5558c272c0b6f4131f0d49461b704eab0db03b1","first_computed_at":"2026-07-05T07:01:40.735302Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:01:40.735302Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AnKl9tjZMzU3gruzuqQYrNC9FcqbYKUif5M7hBP+AirT8YmExbJuiP1/i9t2jNWoGk2y2vGhAME1ot8Fx6RZDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:01:40.735775Z","signed_message":"canonical_sha256_bytes"},"source_id":"2304.08276","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e8d0f21b04ad79cc08d3034d11d6a94a6cdec3e84418ff91006d3ddf2fc58b6a","sha256:7a15e53a6b50490f2b8b082afa8c134581014faf9389b107ef6b2700b7251bb2"],"state_sha256":"bf6b22ce6da494386443dfa3b1b52714194404b4c17c499cdae178f4a06491c2"}