{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:GVOJ7F73OQ5OBUT64FMVXAGKZ4","short_pith_number":"pith:GVOJ7F73","canonical_record":{"source":{"id":"2008.09901","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T19:20:43Z","cross_cats_sorted":[],"title_canon_sha256":"1926314bf1644354acace621b8cbbdee7fca066b0952e5200abd3d92a5630a64","abstract_canon_sha256":"881daca66965a4389b04a2d0896403a2ff9c52bd6b7001440ff05abda7d418a5"},"schema_version":"1.0"},"canonical_sha256":"355c9f97fb743ae0d27ee1595b80cacf152ccad455a838cfc6394d890921093b","source":{"kind":"arxiv","id":"2008.09901","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.09901","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"arxiv_version","alias_value":"2008.09901v1","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.09901","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"pith_short_12","alias_value":"GVOJ7F73OQ5O","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"pith_short_16","alias_value":"GVOJ7F73OQ5OBUT6","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"pith_short_8","alias_value":"GVOJ7F73","created_at":"2026-07-05T01:42:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:GVOJ7F73OQ5OBUT64FMVXAGKZ4","target":"record","payload":{"canonical_record":{"source":{"id":"2008.09901","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T19:20:43Z","cross_cats_sorted":[],"title_canon_sha256":"1926314bf1644354acace621b8cbbdee7fca066b0952e5200abd3d92a5630a64","abstract_canon_sha256":"881daca66965a4389b04a2d0896403a2ff9c52bd6b7001440ff05abda7d418a5"},"schema_version":"1.0"},"canonical_sha256":"355c9f97fb743ae0d27ee1595b80cacf152ccad455a838cfc6394d890921093b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:42:43.026753Z","signature_b64":"upM2FaPOhYMwJgaUElR03BffYoobHF5bTvdFeIwAIbLza6LsQ3AWZ8hXHnLkTzdxGH7Q2HXRxn4udX8y9BWPCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"355c9f97fb743ae0d27ee1595b80cacf152ccad455a838cfc6394d890921093b","last_reissued_at":"2026-07-05T01:42:43.026287Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:42:43.026287Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2008.09901","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":"2026-07-05T01:42:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u1djfkkHICOYGaDO1CCeePIpYr39qMr8+godDiucRBf9IWvMuG/vgr5vjvsZyMFnu4Pur3DLRqcAkLIDY0/QBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T18:35:56.905124Z"},"content_sha256":"b3927cdb292534e5074adfff94395595956f9e5b3600b052feaee6fd1bbadc81","schema_version":"1.0","event_id":"sha256:b3927cdb292534e5074adfff94395595956f9e5b3600b052feaee6fd1bbadc81"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:GVOJ7F73OQ5OBUT64FMVXAGKZ4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovery of 18 stars with -3.10 < [Fe/H] < -1.45 in the Sagittarius dwarf galaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Anirudh Chiti, Anna Frebel, Kylie Y. Hansen","submitted_at":"2020-08-22T19:20:43Z","abstract_excerpt":"Studies of the early chemical evolution of some larger dwarf galaxies ( $>10^7$ solar masses) are limited by the small number of stars known at low metallicities in these systems. Here we present metallicities and carbon abundances for eighteen stars with metallicities between $-3.08 \\le \\text{[Fe/H]} \\le -1.47$ in the Sagittarius dwarf spheroidal galaxy, using medium-resolution spectra from the MagE spectrograph on the Magellan-Baade Telescope. This sample more than doubles the number of known very metal-poor stars ([Fe/H] $\\leq -2.0$) in the Sagittarius dwarf galaxy, and identifies one of th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.09901","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/2008.09901/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T01:42:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bMgk1D3uyCj++59JLQV1axm04z5V/GPzn+DIBZ7F0NZSWdswCZO0leCADHbD2rcyEG7DQ2BOdq2lLvnEvd6UAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T18:35:56.905420Z"},"content_sha256":"bd8a06321b4969ebbfdba5398ea3ce747e53bc3cac91249319fbad8786bab458","schema_version":"1.0","event_id":"sha256:bd8a06321b4969ebbfdba5398ea3ce747e53bc3cac91249319fbad8786bab458"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GVOJ7F73OQ5OBUT64FMVXAGKZ4/bundle.json","state_url":"https://pith.science/pith/GVOJ7F73OQ5OBUT64FMVXAGKZ4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GVOJ7F73OQ5OBUT64FMVXAGKZ4/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":"2026-07-31T18:35:56Z","links":{"resolver":"https://pith.science/pith/GVOJ7F73OQ5OBUT64FMVXAGKZ4","bundle":"https://pith.science/pith/GVOJ7F73OQ5OBUT64FMVXAGKZ4/bundle.json","state":"https://pith.science/pith/GVOJ7F73OQ5OBUT64FMVXAGKZ4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GVOJ7F73OQ5OBUT64FMVXAGKZ4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:GVOJ7F73OQ5OBUT64FMVXAGKZ4","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":"881daca66965a4389b04a2d0896403a2ff9c52bd6b7001440ff05abda7d418a5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T19:20:43Z","title_canon_sha256":"1926314bf1644354acace621b8cbbdee7fca066b0952e5200abd3d92a5630a64"},"schema_version":"1.0","source":{"id":"2008.09901","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.09901","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"arxiv_version","alias_value":"2008.09901v1","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.09901","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"pith_short_12","alias_value":"GVOJ7F73OQ5O","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"pith_short_16","alias_value":"GVOJ7F73OQ5OBUT6","created_at":"2026-07-05T01:42:43Z"},{"alias_kind":"pith_short_8","alias_value":"GVOJ7F73","created_at":"2026-07-05T01:42:43Z"}],"graph_snapshots":[{"event_id":"sha256:bd8a06321b4969ebbfdba5398ea3ce747e53bc3cac91249319fbad8786bab458","target":"graph","created_at":"2026-07-05T01:42:43Z","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/2008.09901/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Studies of the early chemical evolution of some larger dwarf galaxies ( $>10^7$ solar masses) are limited by the small number of stars known at low metallicities in these systems. Here we present metallicities and carbon abundances for eighteen stars with metallicities between $-3.08 \\le \\text{[Fe/H]} \\le -1.47$ in the Sagittarius dwarf spheroidal galaxy, using medium-resolution spectra from the MagE spectrograph on the Magellan-Baade Telescope. This sample more than doubles the number of known very metal-poor stars ([Fe/H] $\\leq -2.0$) in the Sagittarius dwarf galaxy, and identifies one of th","authors_text":"Anirudh Chiti, Anna Frebel, Kylie Y. Hansen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T19:20:43Z","title":"Discovery of 18 stars with -3.10 < [Fe/H] < -1.45 in the Sagittarius dwarf galaxy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.09901","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:b3927cdb292534e5074adfff94395595956f9e5b3600b052feaee6fd1bbadc81","target":"record","created_at":"2026-07-05T01:42:43Z","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":"881daca66965a4389b04a2d0896403a2ff9c52bd6b7001440ff05abda7d418a5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-22T19:20:43Z","title_canon_sha256":"1926314bf1644354acace621b8cbbdee7fca066b0952e5200abd3d92a5630a64"},"schema_version":"1.0","source":{"id":"2008.09901","kind":"arxiv","version":1}},"canonical_sha256":"355c9f97fb743ae0d27ee1595b80cacf152ccad455a838cfc6394d890921093b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"355c9f97fb743ae0d27ee1595b80cacf152ccad455a838cfc6394d890921093b","first_computed_at":"2026-07-05T01:42:43.026287Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:42:43.026287Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"upM2FaPOhYMwJgaUElR03BffYoobHF5bTvdFeIwAIbLza6LsQ3AWZ8hXHnLkTzdxGH7Q2HXRxn4udX8y9BWPCg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:42:43.026753Z","signed_message":"canonical_sha256_bytes"},"source_id":"2008.09901","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b3927cdb292534e5074adfff94395595956f9e5b3600b052feaee6fd1bbadc81","sha256:bd8a06321b4969ebbfdba5398ea3ce747e53bc3cac91249319fbad8786bab458"],"state_sha256":"9c0e43ce7221cf7e8f8e14d2700a128460a2bba80338bc4e3236e04c9b0388f1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HjXmdP1wwdH5fh9vWxYkqM4iYyJaMkhtT651pYWNP9i6mWECf++t+vviRxdLmEB5y95GIq90r311Recrmm/FAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T18:35:56.908210Z","bundle_sha256":"b265ce79dcfbd14f24184efdeca36d945392f394988dd9270df3c8504f10f596"}}