{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:5FJTVXGSBNFH2L4KJRBBCQ6O3U","short_pith_number":"pith:5FJTVXGS","schema_version":"1.0","canonical_sha256":"e9533adcd20b4a7d2f8a4c421143cedd032c203baf9e9c2490bd8ef56669c902","source":{"kind":"arxiv","id":"1909.07225","version":1},"attestation_state":"computed","paper":{"title":"Presolar Grains in Primitive Ungrouped Carbonaceous Chondrite Northwest Africa 5958","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Conel M. O'D. Alexander, Kaitlin Howell, Larry R. Nittler, Rhonda M. Stroud","submitted_at":"2019-09-16T14:16:14Z","abstract_excerpt":"We report a correlated NanoSIMS-transmission electron microscopy study of the ungrouped carbonaceous chondrite Northwest Africa (NWA) 5958. We identified 10 presolar SiC grains, 2 likely presolar graphite grains, and 20 presolar silicate and/or oxide grains in NWA 5958. We suggest a slight modification of the commonly used classification system for presolar oxides and silicates that better reflects the grains' likely stellar origins. The matrix-normalized presolar SiC abundance in NWA 5958 is $18_{-10}^{+15}$ ppm (2$\\sigma$), similar to that seen in many classes of unmetamorphosed chondrites. "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1909.07225","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2019-09-16T14:16:14Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"5786f9283e897f629659e546112cbf9652d7177344e0a904f02ba030211712b8","abstract_canon_sha256":"5d0012195641df3d976820e285d3551a25524cbf9e3a584b78c57e5b2376888c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:11:47.068123Z","signature_b64":"rxdFCN/JyZhHiSekzGA6E42A9bT6SBJeeK7f/Dzd3CPEAS1LCTDbSsVEB06ife/JsdHPdVVNflpcvPjz63wJBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e9533adcd20b4a7d2f8a4c421143cedd032c203baf9e9c2490bd8ef56669c902","last_reissued_at":"2026-07-05T00:11:47.067502Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:11:47.067502Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Presolar Grains in Primitive Ungrouped Carbonaceous Chondrite Northwest Africa 5958","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Conel M. O'D. Alexander, Kaitlin Howell, Larry R. Nittler, Rhonda M. Stroud","submitted_at":"2019-09-16T14:16:14Z","abstract_excerpt":"We report a correlated NanoSIMS-transmission electron microscopy study of the ungrouped carbonaceous chondrite Northwest Africa (NWA) 5958. We identified 10 presolar SiC grains, 2 likely presolar graphite grains, and 20 presolar silicate and/or oxide grains in NWA 5958. We suggest a slight modification of the commonly used classification system for presolar oxides and silicates that better reflects the grains' likely stellar origins. The matrix-normalized presolar SiC abundance in NWA 5958 is $18_{-10}^{+15}$ ppm (2$\\sigma$), similar to that seen in many classes of unmetamorphosed chondrites. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.07225","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1909.07225/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1909.07225","created_at":"2026-07-05T00:11:47.067580+00:00"},{"alias_kind":"arxiv_version","alias_value":"1909.07225v1","created_at":"2026-07-05T00:11:47.067580+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.07225","created_at":"2026-07-05T00:11:47.067580+00:00"},{"alias_kind":"pith_short_12","alias_value":"5FJTVXGSBNFH","created_at":"2026-07-05T00:11:47.067580+00:00"},{"alias_kind":"pith_short_16","alias_value":"5FJTVXGSBNFH2L4K","created_at":"2026-07-05T00:11:47.067580+00:00"},{"alias_kind":"pith_short_8","alias_value":"5FJTVXGS","created_at":"2026-07-05T00:11:47.067580+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U","json":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U.json","graph_json":"https://pith.science/api/pith-number/5FJTVXGSBNFH2L4KJRBBCQ6O3U/graph.json","events_json":"https://pith.science/api/pith-number/5FJTVXGSBNFH2L4KJRBBCQ6O3U/events.json","paper":"https://pith.science/paper/5FJTVXGS"},"agent_actions":{"view_html":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U","download_json":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U.json","view_paper":"https://pith.science/paper/5FJTVXGS","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1909.07225&json=true","fetch_graph":"https://pith.science/api/pith-number/5FJTVXGSBNFH2L4KJRBBCQ6O3U/graph.json","fetch_events":"https://pith.science/api/pith-number/5FJTVXGSBNFH2L4KJRBBCQ6O3U/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U/action/timestamp_anchor","attest_storage":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U/action/storage_attestation","attest_author":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U/action/author_attestation","sign_citation":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U/action/citation_signature","submit_replication":"https://pith.science/pith/5FJTVXGSBNFH2L4KJRBBCQ6O3U/action/replication_record"}},"created_at":"2026-07-05T00:11:47.067580+00:00","updated_at":"2026-07-05T00:11:47.067580+00:00"}