{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:JCWCBEQ6VCC23OYSXNFRZXSX5G","short_pith_number":"pith:JCWCBEQ6","canonical_record":{"source":{"id":"1504.00004","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-31T20:00:14Z","cross_cats_sorted":[],"title_canon_sha256":"ef1ff9e16696ae1a7fffc0cedf50472f9445fd4d1a5850f1b6281047b600e88b","abstract_canon_sha256":"98df51711f3bee73e0ad3ba74bd20d2186a06e8dd1f9925a8a916d975a9c4d62"},"schema_version":"1.0"},"canonical_sha256":"48ac20921ea885adbb12bb4b1cde57e989f0ab9fb4bbe3a7c7be87477ded5b78","source":{"kind":"arxiv","id":"1504.00004","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.00004","created_at":"2026-05-18T01:37:31Z"},{"alias_kind":"arxiv_version","alias_value":"1504.00004v2","created_at":"2026-05-18T01:37:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.00004","created_at":"2026-05-18T01:37:31Z"},{"alias_kind":"pith_short_12","alias_value":"JCWCBEQ6VCC2","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JCWCBEQ6VCC23OYS","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JCWCBEQ6","created_at":"2026-05-18T12:29:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:JCWCBEQ6VCC23OYSXNFRZXSX5G","target":"record","payload":{"canonical_record":{"source":{"id":"1504.00004","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-31T20:00:14Z","cross_cats_sorted":[],"title_canon_sha256":"ef1ff9e16696ae1a7fffc0cedf50472f9445fd4d1a5850f1b6281047b600e88b","abstract_canon_sha256":"98df51711f3bee73e0ad3ba74bd20d2186a06e8dd1f9925a8a916d975a9c4d62"},"schema_version":"1.0"},"canonical_sha256":"48ac20921ea885adbb12bb4b1cde57e989f0ab9fb4bbe3a7c7be87477ded5b78","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:31.025274Z","signature_b64":"mTYloew9Z8VT0P5t9dc5sbVkZ+Wg3S7aLoArc1JY94NrrIegSvWg5MtExKcNKknrHjkW0H2yxxo4P12R9AEWDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"48ac20921ea885adbb12bb4b1cde57e989f0ab9fb4bbe3a7c7be87477ded5b78","last_reissued_at":"2026-05-18T01:37:31.024544Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:31.024544Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1504.00004","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:37:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U7Qpa/oIo90uooXLtp/kHf7h/+OjL0UEJ5iqwCeWL0TKSq/WDa7Rmu6Gb4J//C5uJdocQBXcyXG7Qar9GtUpCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T00:14:58.641858Z"},"content_sha256":"9d1269bb059124c1f5cd522d55f87c74b6ed0af459acb8024931269f3ee88aa2","schema_version":"1.0","event_id":"sha256:9d1269bb059124c1f5cd522d55f87c74b6ed0af459acb8024931269f3ee88aa2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:JCWCBEQ6VCC23OYSXNFRZXSX5G","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Age and Age Spread of the Praesepe and Hyades Clusters: a Consistent, ~800 Myr Picture from Rotating Stellar Models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Chelsea X. Huang, Timothy D. Brandt","submitted_at":"2015-03-31T20:00:14Z","abstract_excerpt":"We fit the upper main sequence of the Praesepe and Hyades open clusters using stellar models with and without rotation. When neglecting rotation, we find that no single isochrone can fit the entire upper main sequence at the clusters' spectroscopic metallicity: more massive stars appear, at high significance, to be younger than less massive stars. This discrepancy is consistent with earlier studies, but vanishes when including stellar rotation. The entire upper main sequence of both clusters is very well-fit by a distribution of 800 Myr-old stars with the spectroscopically measured [Fe/H]=0.12"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.00004","kind":"arxiv","version":2},"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":"2026-05-18T01:37:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vMAmvIhwwuOXJ8DObKYgPVEZiO8wT6yQzwUKSyqmj072TgO5OMYQU54HQ0yOf+yNgEPyKtlmO8q8638Q+kS/CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T00:14:58.642554Z"},"content_sha256":"166c89fe2e43706bb0bc43bc6bb6f4667a3c0a4b5b8ab66a6ba7edc8c04e649a","schema_version":"1.0","event_id":"sha256:166c89fe2e43706bb0bc43bc6bb6f4667a3c0a4b5b8ab66a6ba7edc8c04e649a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JCWCBEQ6VCC23OYSXNFRZXSX5G/bundle.json","state_url":"https://pith.science/pith/JCWCBEQ6VCC23OYSXNFRZXSX5G/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JCWCBEQ6VCC23OYSXNFRZXSX5G/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":"2026-06-07T00:14:58Z","links":{"resolver":"https://pith.science/pith/JCWCBEQ6VCC23OYSXNFRZXSX5G","bundle":"https://pith.science/pith/JCWCBEQ6VCC23OYSXNFRZXSX5G/bundle.json","state":"https://pith.science/pith/JCWCBEQ6VCC23OYSXNFRZXSX5G/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JCWCBEQ6VCC23OYSXNFRZXSX5G/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:JCWCBEQ6VCC23OYSXNFRZXSX5G","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":"98df51711f3bee73e0ad3ba74bd20d2186a06e8dd1f9925a8a916d975a9c4d62","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-31T20:00:14Z","title_canon_sha256":"ef1ff9e16696ae1a7fffc0cedf50472f9445fd4d1a5850f1b6281047b600e88b"},"schema_version":"1.0","source":{"id":"1504.00004","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.00004","created_at":"2026-05-18T01:37:31Z"},{"alias_kind":"arxiv_version","alias_value":"1504.00004v2","created_at":"2026-05-18T01:37:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.00004","created_at":"2026-05-18T01:37:31Z"},{"alias_kind":"pith_short_12","alias_value":"JCWCBEQ6VCC2","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JCWCBEQ6VCC23OYS","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JCWCBEQ6","created_at":"2026-05-18T12:29:27Z"}],"graph_snapshots":[{"event_id":"sha256:166c89fe2e43706bb0bc43bc6bb6f4667a3c0a4b5b8ab66a6ba7edc8c04e649a","target":"graph","created_at":"2026-05-18T01:37:31Z","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":"We fit the upper main sequence of the Praesepe and Hyades open clusters using stellar models with and without rotation. When neglecting rotation, we find that no single isochrone can fit the entire upper main sequence at the clusters' spectroscopic metallicity: more massive stars appear, at high significance, to be younger than less massive stars. This discrepancy is consistent with earlier studies, but vanishes when including stellar rotation. The entire upper main sequence of both clusters is very well-fit by a distribution of 800 Myr-old stars with the spectroscopically measured [Fe/H]=0.12","authors_text":"Chelsea X. Huang, Timothy D. Brandt","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-31T20:00:14Z","title":"The Age and Age Spread of the Praesepe and Hyades Clusters: a Consistent, ~800 Myr Picture from Rotating Stellar Models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.00004","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":"sha256:9d1269bb059124c1f5cd522d55f87c74b6ed0af459acb8024931269f3ee88aa2","target":"record","created_at":"2026-05-18T01:37:31Z","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":"98df51711f3bee73e0ad3ba74bd20d2186a06e8dd1f9925a8a916d975a9c4d62","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-03-31T20:00:14Z","title_canon_sha256":"ef1ff9e16696ae1a7fffc0cedf50472f9445fd4d1a5850f1b6281047b600e88b"},"schema_version":"1.0","source":{"id":"1504.00004","kind":"arxiv","version":2}},"canonical_sha256":"48ac20921ea885adbb12bb4b1cde57e989f0ab9fb4bbe3a7c7be87477ded5b78","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"48ac20921ea885adbb12bb4b1cde57e989f0ab9fb4bbe3a7c7be87477ded5b78","first_computed_at":"2026-05-18T01:37:31.024544Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:31.024544Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mTYloew9Z8VT0P5t9dc5sbVkZ+Wg3S7aLoArc1JY94NrrIegSvWg5MtExKcNKknrHjkW0H2yxxo4P12R9AEWDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:31.025274Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.00004","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d1269bb059124c1f5cd522d55f87c74b6ed0af459acb8024931269f3ee88aa2","sha256:166c89fe2e43706bb0bc43bc6bb6f4667a3c0a4b5b8ab66a6ba7edc8c04e649a"],"state_sha256":"c1eb4f1048edeeb53ec2f6bd213b927ad576491db212b276037cfafa9c024aa8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/ClvNMkuCkLLWXS4BYNBYNmRZkjI61uVtU529VhwF6mRkWgsl5W766GWdbEJ4CqZMwJ42ZbD/pLiXdB/4ztUAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T00:14:58.646770Z","bundle_sha256":"fe0802cf38c469df94a5d8c540f0fede3333533f199d90bc34f4e867dd687441"}}