{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:NJOCIDEDI5T7TNI2HV4GVESOP2","short_pith_number":"pith:NJOCIDED","canonical_record":{"source":{"id":"1203.4234","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-19T20:00:11Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"abee59c3d8f01bc7594821031be117532d662046bc8c53641a26d21231a04941","abstract_canon_sha256":"79f0d884a41ea2bc011aab66b7ab44ff263063e0204693821ac963895a6a721e"},"schema_version":"1.0"},"canonical_sha256":"6a5c240c834767f9b51a3d786a924e7eae68859fd60a2221720e19efc58f3f85","source":{"kind":"arxiv","id":"1203.4234","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.4234","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"arxiv_version","alias_value":"1203.4234v1","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.4234","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"pith_short_12","alias_value":"NJOCIDEDI5T7","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"NJOCIDEDI5T7TNI2","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"NJOCIDED","created_at":"2026-05-18T12:27:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:NJOCIDEDI5T7TNI2HV4GVESOP2","target":"record","payload":{"canonical_record":{"source":{"id":"1203.4234","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-19T20:00:11Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"abee59c3d8f01bc7594821031be117532d662046bc8c53641a26d21231a04941","abstract_canon_sha256":"79f0d884a41ea2bc011aab66b7ab44ff263063e0204693821ac963895a6a721e"},"schema_version":"1.0"},"canonical_sha256":"6a5c240c834767f9b51a3d786a924e7eae68859fd60a2221720e19efc58f3f85","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:05.977554Z","signature_b64":"CZ8efphv56j12+hLbRO2limb7RFXDbcj4TztWcZBp6DXXNXAy3oE6I/ZqNymi7StWxOVEVjcnOi08EeClxB9Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6a5c240c834767f9b51a3d786a924e7eae68859fd60a2221720e19efc58f3f85","last_reissued_at":"2026-05-18T01:58:05.977134Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:05.977134Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1203.4234","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:58:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H4dFRX1WpZHWYoV7TUkh2TEjF98y6tvuaI7A0S+o5kBLqAnW269zFUNPT+l+5H+ih6NFt686VDNKKeLRLGS0Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:58:23.742842Z"},"content_sha256":"09ad02869681631b88e080aff405510adaddd7e14164c86b28c1a27a2f14813b","schema_version":"1.0","event_id":"sha256:09ad02869681631b88e080aff405510adaddd7e14164c86b28c1a27a2f14813b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:NJOCIDEDI5T7TNI2HV4GVESOP2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The formation of the extremely primitive star SDSS J102915+172927 relies on dust","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Alessandro Chieffi, Andrea Ferrara, Kazuyuki Omukai, Marco Limongi, Raffaella Schneider, Ruben Salvaterra, Simone Bianchi","submitted_at":"2012-03-19T20:00:11Z","abstract_excerpt":"The relative importance of metals and dust grains in the formation of the first low-mass stars has been a subject of debate. The recently discovered Galactic halo star SDSS J102915+172927 (Caffau et al. 2011) has a mass less than 0.8 Msun and a metallicity of Z = 4.5 10^{-5} Zsun. We investigate the origin and properties of this star by reconstructing the physical conditions in its birth cloud. We show that the observed elemental abundance trend of SDSS J102915+172927 can be well fitted by the yields of core-collapse supernovae with metal-free progenitors of 20 Msun and 35 Msun. Using these se"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.4234","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:58:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pn94wB2ho0YLnmgPfsThasKUkZLmCpkHxtNSRVlFhDayT0e3DS2YCNEmsVYUSTJgRwoQrfkJ0Gu1+mEN8390Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:58:23.743296Z"},"content_sha256":"8ac89cdb0a5eb65904fcae17e412a88d6b686f9463eb74b2589a1bec427786d0","schema_version":"1.0","event_id":"sha256:8ac89cdb0a5eb65904fcae17e412a88d6b686f9463eb74b2589a1bec427786d0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NJOCIDEDI5T7TNI2HV4GVESOP2/bundle.json","state_url":"https://pith.science/pith/NJOCIDEDI5T7TNI2HV4GVESOP2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NJOCIDEDI5T7TNI2HV4GVESOP2/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T17:58:23Z","links":{"resolver":"https://pith.science/pith/NJOCIDEDI5T7TNI2HV4GVESOP2","bundle":"https://pith.science/pith/NJOCIDEDI5T7TNI2HV4GVESOP2/bundle.json","state":"https://pith.science/pith/NJOCIDEDI5T7TNI2HV4GVESOP2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NJOCIDEDI5T7TNI2HV4GVESOP2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:NJOCIDEDI5T7TNI2HV4GVESOP2","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":"79f0d884a41ea2bc011aab66b7ab44ff263063e0204693821ac963895a6a721e","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-19T20:00:11Z","title_canon_sha256":"abee59c3d8f01bc7594821031be117532d662046bc8c53641a26d21231a04941"},"schema_version":"1.0","source":{"id":"1203.4234","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.4234","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"arxiv_version","alias_value":"1203.4234v1","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.4234","created_at":"2026-05-18T01:58:05Z"},{"alias_kind":"pith_short_12","alias_value":"NJOCIDEDI5T7","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"NJOCIDEDI5T7TNI2","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"NJOCIDED","created_at":"2026-05-18T12:27:16Z"}],"graph_snapshots":[{"event_id":"sha256:8ac89cdb0a5eb65904fcae17e412a88d6b686f9463eb74b2589a1bec427786d0","target":"graph","created_at":"2026-05-18T01:58:05Z","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":"The relative importance of metals and dust grains in the formation of the first low-mass stars has been a subject of debate. The recently discovered Galactic halo star SDSS J102915+172927 (Caffau et al. 2011) has a mass less than 0.8 Msun and a metallicity of Z = 4.5 10^{-5} Zsun. We investigate the origin and properties of this star by reconstructing the physical conditions in its birth cloud. We show that the observed elemental abundance trend of SDSS J102915+172927 can be well fitted by the yields of core-collapse supernovae with metal-free progenitors of 20 Msun and 35 Msun. Using these se","authors_text":"Alessandro Chieffi, Andrea Ferrara, Kazuyuki Omukai, Marco Limongi, Raffaella Schneider, Ruben Salvaterra, Simone Bianchi","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-19T20:00:11Z","title":"The formation of the extremely primitive star SDSS J102915+172927 relies on dust"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.4234","kind":"arxiv","version":1},"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":"sha256:09ad02869681631b88e080aff405510adaddd7e14164c86b28c1a27a2f14813b","target":"record","created_at":"2026-05-18T01:58:05Z","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":"79f0d884a41ea2bc011aab66b7ab44ff263063e0204693821ac963895a6a721e","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-19T20:00:11Z","title_canon_sha256":"abee59c3d8f01bc7594821031be117532d662046bc8c53641a26d21231a04941"},"schema_version":"1.0","source":{"id":"1203.4234","kind":"arxiv","version":1}},"canonical_sha256":"6a5c240c834767f9b51a3d786a924e7eae68859fd60a2221720e19efc58f3f85","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6a5c240c834767f9b51a3d786a924e7eae68859fd60a2221720e19efc58f3f85","first_computed_at":"2026-05-18T01:58:05.977134Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:05.977134Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CZ8efphv56j12+hLbRO2limb7RFXDbcj4TztWcZBp6DXXNXAy3oE6I/ZqNymi7StWxOVEVjcnOi08EeClxB9Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:05.977554Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.4234","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:09ad02869681631b88e080aff405510adaddd7e14164c86b28c1a27a2f14813b","sha256:8ac89cdb0a5eb65904fcae17e412a88d6b686f9463eb74b2589a1bec427786d0"],"state_sha256":"dc9aa3aae497a634c0035496742a5d822d0c5c342ffd9335bdb6e26c41bd5745"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1s8ZzFm73Fa1tMMvWbeGmHz84ov7t0ta/uA2lKG4FpaAMOThpPrYwgVERgseW1K+A4lfUlJPE8JIRg33evFBAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T17:58:23.746039Z","bundle_sha256":"8c0e9df1caae19b199bbb731703f131fddfdf673026db114f1279cd3ca74248d"}}