{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:BBD4BK5ZGHLL6NHDCL72ICHFCV","short_pith_number":"pith:BBD4BK5Z","canonical_record":{"source":{"id":"1809.10157","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-26T18:01:13Z","cross_cats_sorted":[],"title_canon_sha256":"943da3b40432beec07957c66ba1edca422625cb9967530637b0d8063ea412a27","abstract_canon_sha256":"d677d540f1f1a6198ffe064039cafcc96a48a6d1a340d96baa2594c3905e0199"},"schema_version":"1.0"},"canonical_sha256":"0847c0abb931d6bf34e312ffa408e515757843920b183cfc51eae1345bd2034d","source":{"kind":"arxiv","id":"1809.10157","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.10157","created_at":"2026-05-17T23:59:04Z"},{"alias_kind":"arxiv_version","alias_value":"1809.10157v1","created_at":"2026-05-17T23:59:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.10157","created_at":"2026-05-17T23:59:04Z"},{"alias_kind":"pith_short_12","alias_value":"BBD4BK5ZGHLL","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_16","alias_value":"BBD4BK5ZGHLL6NHD","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_8","alias_value":"BBD4BK5Z","created_at":"2026-05-18T12:32:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:BBD4BK5ZGHLL6NHDCL72ICHFCV","target":"record","payload":{"canonical_record":{"source":{"id":"1809.10157","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-26T18:01:13Z","cross_cats_sorted":[],"title_canon_sha256":"943da3b40432beec07957c66ba1edca422625cb9967530637b0d8063ea412a27","abstract_canon_sha256":"d677d540f1f1a6198ffe064039cafcc96a48a6d1a340d96baa2594c3905e0199"},"schema_version":"1.0"},"canonical_sha256":"0847c0abb931d6bf34e312ffa408e515757843920b183cfc51eae1345bd2034d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:04.899933Z","signature_b64":"MNMsnUV1qRG2r9/VR/4iQNuuezkPDUGN/8euWEJJLK5efsQNkbccOYMdcyntXjqbOlv01LMI6nRNK7Rnz7m5BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0847c0abb931d6bf34e312ffa408e515757843920b183cfc51eae1345bd2034d","last_reissued_at":"2026-05-17T23:59:04.899517Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:04.899517Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.10157","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":"2026-05-17T23:59:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2ctPNuxsx6lSyesFZ9fSpNrp3Yei8QSYwlnyvEkVzXLwLlzB4jEhPaYHfFhzMMmRLV2OkP+N37yrgvo9VgaGAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T16:17:36.632993Z"},"content_sha256":"ce55997afe42c5a8acbf8dfc36000b5fe60682aee8a52b8186be3c496316e463","schema_version":"1.0","event_id":"sha256:ce55997afe42c5a8acbf8dfc36000b5fe60682aee8a52b8186be3c496316e463"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:BBD4BK5ZGHLL6NHDCL72ICHFCV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Understanding the orbital periods of CEMP-s stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Carlo Abate, Onno R. Pols, Richard J. Stancliffe","submitted_at":"2018-09-26T18:01:13Z","abstract_excerpt":"The chemical enrichments detected in CEMP-$s$ stars are believed to be the consequence of a mass-transfer episode from a now extinct AGB primary star. This hypothesis is borne out by the fact that most CEMP-$s$ stars exhibit RV variations suggesting that they are in binary systems. We use the period distribution of an observed sample of CEMP-$s$ stars to investigate the constraints it imposes on our models of binary evolution and on the properties of the metal-poor binary population in the Galactic halo. We simulate binary populations using different assumptions about the initial period distri"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.10157","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":"2026-05-17T23:59:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R5tMKhmAKhUwqjromlpH6nxpAuw+cyT6CkbugwbFyn2Dg1FMOv/+eHniL2xGdTNjs8Y8hUNCyBX5YVZrXcPlDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T16:17:36.633348Z"},"content_sha256":"52137b3468ef05bf68f1ecaf0977ba21266d8ae753c17b3db7e12fc7ed108e47","schema_version":"1.0","event_id":"sha256:52137b3468ef05bf68f1ecaf0977ba21266d8ae753c17b3db7e12fc7ed108e47"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BBD4BK5ZGHLL6NHDCL72ICHFCV/bundle.json","state_url":"https://pith.science/pith/BBD4BK5ZGHLL6NHDCL72ICHFCV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BBD4BK5ZGHLL6NHDCL72ICHFCV/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":"2026-06-05T16:17:36Z","links":{"resolver":"https://pith.science/pith/BBD4BK5ZGHLL6NHDCL72ICHFCV","bundle":"https://pith.science/pith/BBD4BK5ZGHLL6NHDCL72ICHFCV/bundle.json","state":"https://pith.science/pith/BBD4BK5ZGHLL6NHDCL72ICHFCV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BBD4BK5ZGHLL6NHDCL72ICHFCV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:BBD4BK5ZGHLL6NHDCL72ICHFCV","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":"d677d540f1f1a6198ffe064039cafcc96a48a6d1a340d96baa2594c3905e0199","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-26T18:01:13Z","title_canon_sha256":"943da3b40432beec07957c66ba1edca422625cb9967530637b0d8063ea412a27"},"schema_version":"1.0","source":{"id":"1809.10157","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.10157","created_at":"2026-05-17T23:59:04Z"},{"alias_kind":"arxiv_version","alias_value":"1809.10157v1","created_at":"2026-05-17T23:59:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.10157","created_at":"2026-05-17T23:59:04Z"},{"alias_kind":"pith_short_12","alias_value":"BBD4BK5ZGHLL","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_16","alias_value":"BBD4BK5ZGHLL6NHD","created_at":"2026-05-18T12:32:13Z"},{"alias_kind":"pith_short_8","alias_value":"BBD4BK5Z","created_at":"2026-05-18T12:32:13Z"}],"graph_snapshots":[{"event_id":"sha256:52137b3468ef05bf68f1ecaf0977ba21266d8ae753c17b3db7e12fc7ed108e47","target":"graph","created_at":"2026-05-17T23:59:04Z","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 chemical enrichments detected in CEMP-$s$ stars are believed to be the consequence of a mass-transfer episode from a now extinct AGB primary star. This hypothesis is borne out by the fact that most CEMP-$s$ stars exhibit RV variations suggesting that they are in binary systems. We use the period distribution of an observed sample of CEMP-$s$ stars to investigate the constraints it imposes on our models of binary evolution and on the properties of the metal-poor binary population in the Galactic halo. We simulate binary populations using different assumptions about the initial period distri","authors_text":"Carlo Abate, Onno R. Pols, Richard J. Stancliffe","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-26T18:01:13Z","title":"Understanding the orbital periods of CEMP-s stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.10157","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:ce55997afe42c5a8acbf8dfc36000b5fe60682aee8a52b8186be3c496316e463","target":"record","created_at":"2026-05-17T23:59:04Z","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":"d677d540f1f1a6198ffe064039cafcc96a48a6d1a340d96baa2594c3905e0199","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-26T18:01:13Z","title_canon_sha256":"943da3b40432beec07957c66ba1edca422625cb9967530637b0d8063ea412a27"},"schema_version":"1.0","source":{"id":"1809.10157","kind":"arxiv","version":1}},"canonical_sha256":"0847c0abb931d6bf34e312ffa408e515757843920b183cfc51eae1345bd2034d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0847c0abb931d6bf34e312ffa408e515757843920b183cfc51eae1345bd2034d","first_computed_at":"2026-05-17T23:59:04.899517Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:04.899517Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MNMsnUV1qRG2r9/VR/4iQNuuezkPDUGN/8euWEJJLK5efsQNkbccOYMdcyntXjqbOlv01LMI6nRNK7Rnz7m5BA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:04.899933Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.10157","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce55997afe42c5a8acbf8dfc36000b5fe60682aee8a52b8186be3c496316e463","sha256:52137b3468ef05bf68f1ecaf0977ba21266d8ae753c17b3db7e12fc7ed108e47"],"state_sha256":"bb3330a35972eb906783d779b7a48d73365577e20e07f0d227d30c8adc9aeb12"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jdiKDRzTgL0xXK5EelOxrqpEY2jouvfM3/CJIzy1vuZWU+FvBJW8eeczDSpCgPClgAM10bmRuTXD8BRkfrkmAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T16:17:36.635414Z","bundle_sha256":"f379df368761ddc4447f6052cdf3ef32f8f4658c8925584a8f61dd11382a65a8"}}