{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:FZXLXH7DM75M2OPKPBRKT3DPUV","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":"56f6752e8d241c666c92ddbb403df994a1ec2f41e57f4156082e0e527b324dac","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-02-17T14:11:54Z","title_canon_sha256":"e6436e28f5a79f08b29d2215ed1c3315598c07440b93e311f4f909b1b273dd55"},"schema_version":"1.0","source":{"id":"1802.06240","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.06240","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"arxiv_version","alias_value":"1802.06240v2","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.06240","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"pith_short_12","alias_value":"FZXLXH7DM75M","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"FZXLXH7DM75M2OPK","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"FZXLXH7D","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:9f5c16acd2bfdb8f8c9305eb11165f811132240855bf8cbb89e290e79da96414","target":"graph","created_at":"2026-05-18T00:21:05Z","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":"Only a handful of stars have been identified with an iron abundance [Fe/H]<-5, and only one at [Fe/H]<-7. These stars have very large carbon-to-iron ratios, with A(C)~7.0, most likely due to fallback in core-collapse supernovae, which makes their total metallicity Z much higher than their iron abundances. The failure to find population III stars, those with no metals, has been interpreted, with support from theoretical modeling, as the result of a top-heavy initial mass function. With zero or very low metal abundance limiting radiative cooling, the formation of low-mass stars could be inhibite","authors_text":"Carlos Allende Prieto, David S. Aguado, Jonay I. Gonz\\'alez Hern\\'andez, Rafael Rebolo","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-02-17T14:11:54Z","title":"J0023+0307: A mega metal-poor dwarf star from SDSS/BOSS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.06240","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:d1c5e67d929735f84293a6f204fe588619ad04a67a4ec767c560dd47472ef986","target":"record","created_at":"2026-05-18T00:21:05Z","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":"56f6752e8d241c666c92ddbb403df994a1ec2f41e57f4156082e0e527b324dac","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-02-17T14:11:54Z","title_canon_sha256":"e6436e28f5a79f08b29d2215ed1c3315598c07440b93e311f4f909b1b273dd55"},"schema_version":"1.0","source":{"id":"1802.06240","kind":"arxiv","version":2}},"canonical_sha256":"2e6ebb9fe367facd39ea7862a9ec6fa5532ac8d427385c4a341defc4ce5dbbe2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2e6ebb9fe367facd39ea7862a9ec6fa5532ac8d427385c4a341defc4ce5dbbe2","first_computed_at":"2026-05-18T00:21:05.915447Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:21:05.915447Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WRcJbo0XMorlG5elwkSaejkWmh3Sd0ZmAvjQuoupcDY1amBDVyfYwqqv7O2HyYzTIbrxvS8DqraGe/vzpxZjBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:21:05.915882Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.06240","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d1c5e67d929735f84293a6f204fe588619ad04a67a4ec767c560dd47472ef986","sha256:9f5c16acd2bfdb8f8c9305eb11165f811132240855bf8cbb89e290e79da96414"],"state_sha256":"89ef0ca7a978335d2879b99c7c389268659107fa2a01e9d1449b9ec224487966"}