{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2001:ZY7BFPXOODGKCJAXCQL4CEIUPA","short_pith_number":"pith:ZY7BFPXO","canonical_record":{"source":{"id":"astro-ph/0104347","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-04-20T20:20:22Z","cross_cats_sorted":[],"title_canon_sha256":"23d6f802e8d01d72ece72832a3397fa1489be14a5bca6ee92ee1c0c93b59e743","abstract_canon_sha256":"8fa959f3d03ee398b8453880ca489086d93de35ab81dddc02565f913ca8114bd"},"schema_version":"1.0"},"canonical_sha256":"ce3e12beee70cca124171417c111147821ccf36f16c578a13dea795ef945cdb0","source":{"kind":"arxiv","id":"astro-ph/0104347","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0104347","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0104347v1","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0104347","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"pith_short_12","alias_value":"ZY7BFPXOODGK","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"pith_short_16","alias_value":"ZY7BFPXOODGKCJAX","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"pith_short_8","alias_value":"ZY7BFPXO","created_at":"2026-07-04T16:23:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2001:ZY7BFPXOODGKCJAXCQL4CEIUPA","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0104347","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-04-20T20:20:22Z","cross_cats_sorted":[],"title_canon_sha256":"23d6f802e8d01d72ece72832a3397fa1489be14a5bca6ee92ee1c0c93b59e743","abstract_canon_sha256":"8fa959f3d03ee398b8453880ca489086d93de35ab81dddc02565f913ca8114bd"},"schema_version":"1.0"},"canonical_sha256":"ce3e12beee70cca124171417c111147821ccf36f16c578a13dea795ef945cdb0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:23:15.909409Z","signature_b64":"3i+5mlJugJaxaOEV+kcG3N0pFvPJhu9Gg2ywUogEg7WUjLx9B9OETgeQ5u/afyAqX811SgkBRMb2fjacD0MuCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ce3e12beee70cca124171417c111147821ccf36f16c578a13dea795ef945cdb0","last_reissued_at":"2026-07-04T16:23:15.908914Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:23:15.908914Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0104347","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":"2026-07-04T16:23:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2ZCPmmW9T/Yx4VomymiOC8t/MCxyh+NGkE5Sas2UuwkElRttjMCxFXXLvO3cD7SQN6WbU3FiyvNtrlCI+slcCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T17:37:23.788937Z"},"content_sha256":"d5cef7ea63d0736bb8d0b0d6c204d590d638716e5af8abbbd3041cb66acba228","schema_version":"1.0","event_id":"sha256:d5cef7ea63d0736bb8d0b0d6c204d590d638716e5af8abbbd3041cb66acba228"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2001:ZY7BFPXOODGKCJAXCQL4CEIUPA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Disk Frequencies and Lifetimes in Young Clusters","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Charles J. Lada, Elizabeth A. Lada, Karl E. Haisch Jr.","submitted_at":"2001-04-20T20:20:22Z","abstract_excerpt":"We report the results of the first sensitive L-band (3.5 micron) survey of the intermediate age (2.5 - 30 Myr) clusters NGC 2264, NGC 2362 and NGC 1960. We use JHKL colors to obtain a census of the circumstellar disk fractions in each cluster. We find disk fractions of 52% +/- 10%, 12% +/- 4% and 3% +/- 3% for the three clusters respectively. Together with our previously published JHKL investigations of the younger NGC 2024, Trapezium and IC 348 clusters, we have completed the first systematic and homogenous survey for circumstellar disks in a sample of young clusters that both span a signific"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0104347","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/astro-ph/0104347/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":"2026-07-04T16:23:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QyIR7xxgtaYe/7aJ5jeHekMuQyXQdjFoWA6/9TKHFT2TcVJ/vqLLtecUR1MhJtuN4UeQboJzVGO6NTwdhmfWBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T17:37:23.789495Z"},"content_sha256":"4fdb9e888aafe975227528d22c1477d8abc567d0420974bf3349992f4124e250","schema_version":"1.0","event_id":"sha256:4fdb9e888aafe975227528d22c1477d8abc567d0420974bf3349992f4124e250"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZY7BFPXOODGKCJAXCQL4CEIUPA/bundle.json","state_url":"https://pith.science/pith/ZY7BFPXOODGKCJAXCQL4CEIUPA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZY7BFPXOODGKCJAXCQL4CEIUPA/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":"2026-08-01T17:37:23Z","links":{"resolver":"https://pith.science/pith/ZY7BFPXOODGKCJAXCQL4CEIUPA","bundle":"https://pith.science/pith/ZY7BFPXOODGKCJAXCQL4CEIUPA/bundle.json","state":"https://pith.science/pith/ZY7BFPXOODGKCJAXCQL4CEIUPA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZY7BFPXOODGKCJAXCQL4CEIUPA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:ZY7BFPXOODGKCJAXCQL4CEIUPA","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":"8fa959f3d03ee398b8453880ca489086d93de35ab81dddc02565f913ca8114bd","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-04-20T20:20:22Z","title_canon_sha256":"23d6f802e8d01d72ece72832a3397fa1489be14a5bca6ee92ee1c0c93b59e743"},"schema_version":"1.0","source":{"id":"astro-ph/0104347","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0104347","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0104347v1","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0104347","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"pith_short_12","alias_value":"ZY7BFPXOODGK","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"pith_short_16","alias_value":"ZY7BFPXOODGKCJAX","created_at":"2026-07-04T16:23:15Z"},{"alias_kind":"pith_short_8","alias_value":"ZY7BFPXO","created_at":"2026-07-04T16:23:15Z"}],"graph_snapshots":[{"event_id":"sha256:4fdb9e888aafe975227528d22c1477d8abc567d0420974bf3349992f4124e250","target":"graph","created_at":"2026-07-04T16:23:15Z","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/astro-ph/0104347/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report the results of the first sensitive L-band (3.5 micron) survey of the intermediate age (2.5 - 30 Myr) clusters NGC 2264, NGC 2362 and NGC 1960. We use JHKL colors to obtain a census of the circumstellar disk fractions in each cluster. We find disk fractions of 52% +/- 10%, 12% +/- 4% and 3% +/- 3% for the three clusters respectively. Together with our previously published JHKL investigations of the younger NGC 2024, Trapezium and IC 348 clusters, we have completed the first systematic and homogenous survey for circumstellar disks in a sample of young clusters that both span a signific","authors_text":"Charles J. Lada, Elizabeth A. Lada, Karl E. Haisch Jr.","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2001-04-20T20:20:22Z","title":"Disk Frequencies and Lifetimes in Young Clusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0104347","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:d5cef7ea63d0736bb8d0b0d6c204d590d638716e5af8abbbd3041cb66acba228","target":"record","created_at":"2026-07-04T16:23:15Z","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":"8fa959f3d03ee398b8453880ca489086d93de35ab81dddc02565f913ca8114bd","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-04-20T20:20:22Z","title_canon_sha256":"23d6f802e8d01d72ece72832a3397fa1489be14a5bca6ee92ee1c0c93b59e743"},"schema_version":"1.0","source":{"id":"astro-ph/0104347","kind":"arxiv","version":1}},"canonical_sha256":"ce3e12beee70cca124171417c111147821ccf36f16c578a13dea795ef945cdb0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ce3e12beee70cca124171417c111147821ccf36f16c578a13dea795ef945cdb0","first_computed_at":"2026-07-04T16:23:15.908914Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:23:15.908914Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3i+5mlJugJaxaOEV+kcG3N0pFvPJhu9Gg2ywUogEg7WUjLx9B9OETgeQ5u/afyAqX811SgkBRMb2fjacD0MuCQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:23:15.909409Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0104347","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d5cef7ea63d0736bb8d0b0d6c204d590d638716e5af8abbbd3041cb66acba228","sha256:4fdb9e888aafe975227528d22c1477d8abc567d0420974bf3349992f4124e250"],"state_sha256":"bfbe3a0db01af73c805c40882e115d06f3dc1775e36077595800e8f7785f00f5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bhTwkpClCcX56xoUT26Dy9vTaHVBrkWtgACFjdOkl3RSUkUwVRx2NkK0myDAz9KKOHz6LJDBLPW4eNy+FIZdDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T17:37:23.792930Z","bundle_sha256":"51ac0f91ba10618cd06b837ad1147418cd83e76a4b580a274822140295a0eae4"}}