{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:EALJAAJJ4IHZVZCPWTKBLECT3P","short_pith_number":"pith:EALJAAJJ","canonical_record":{"source":{"id":"1108.1015","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-04T07:55:19Z","cross_cats_sorted":[],"title_canon_sha256":"0b4922cba71fcf4e43b17f3c65e4e110ddabaf27128a4263db1e5ba817555f19","abstract_canon_sha256":"b3c56db958a0c2120c0762d3e1623fe2ea02440d9911485e27289908f46f6705"},"schema_version":"1.0"},"canonical_sha256":"2016900129e20f9ae44fb4d4159053dbd332cb8c1468b28139d2733b3333a6a4","source":{"kind":"arxiv","id":"1108.1015","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.1015","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"arxiv_version","alias_value":"1108.1015v1","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.1015","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"pith_short_12","alias_value":"EALJAAJJ4IHZ","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_16","alias_value":"EALJAAJJ4IHZVZCP","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_8","alias_value":"EALJAAJJ","created_at":"2026-05-18T12:26:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:EALJAAJJ4IHZVZCPWTKBLECT3P","target":"record","payload":{"canonical_record":{"source":{"id":"1108.1015","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-04T07:55:19Z","cross_cats_sorted":[],"title_canon_sha256":"0b4922cba71fcf4e43b17f3c65e4e110ddabaf27128a4263db1e5ba817555f19","abstract_canon_sha256":"b3c56db958a0c2120c0762d3e1623fe2ea02440d9911485e27289908f46f6705"},"schema_version":"1.0"},"canonical_sha256":"2016900129e20f9ae44fb4d4159053dbd332cb8c1468b28139d2733b3333a6a4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:03.070416Z","signature_b64":"aNfdXZhlSPD/w5OuDK+gJqEjPAT9UggXhADXPPy+F/osZ/PJTOF+5BTndFMoOoGL6goAjYOKAA1wjIhOn2aQAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2016900129e20f9ae44fb4d4159053dbd332cb8c1468b28139d2733b3333a6a4","last_reissued_at":"2026-05-18T02:01:03.069680Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:03.069680Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.1015","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":"2026-05-18T02:01:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r6cPlp7a2akmfAHsH1OZ+q5bK4WKokxsHLI6bah+6RHdHzgkw6QNYIBcb8byCLc955T0ebt4H84D5m9qUgJiAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T21:17:46.116783Z"},"content_sha256":"deb38a83e425c9aa9cc037f21bd4b73090432599d3b6ed7add74250f3aebac7a","schema_version":"1.0","event_id":"sha256:deb38a83e425c9aa9cc037f21bd4b73090432599d3b6ed7add74250f3aebac7a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:EALJAAJJ4IHZVZCPWTKBLECT3P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantitative Evidence for an Intrinsic Age Spread in the Orion Nebula Cluster","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"D. R. Soderblom, L. Ricci, M. Reggiani, M. R. Meyer, M. Robberto, N. Da Rio","submitted_at":"2011-08-04T07:55:19Z","abstract_excerpt":"Aims. We present a study of the distribution of stellar ages in the Orion Nebula Cluster (ONC) based on accurate HST photometry taken from the HST Treasury Program observations of the ONC utilizing the most recent estimate of the cluster's distance (Menten et al. 2007). We investigate the presence of an intrinsic age spread in the region and a possible trend of age with the spatial distribution. Methods. We estimate the extinction and accretion luminosity towards each source by performing synthetic photometry on an empirical calibration of atmospheric models (Da Rio et al. 2010) using the pack"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.1015","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":"2026-05-18T02:01:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8skD6bykKk4HdthB17uQOiAxHkP+M9HLLIymhCEirjPyqulpVTwDlaZoLtHt5npmQ+pNcSukkpVbP9srPm4TBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T21:17:46.117131Z"},"content_sha256":"991b972c403f2550fceae8dcfadc94370552f475ac56eb5f888dffa82e888dc2","schema_version":"1.0","event_id":"sha256:991b972c403f2550fceae8dcfadc94370552f475ac56eb5f888dffa82e888dc2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EALJAAJJ4IHZVZCPWTKBLECT3P/bundle.json","state_url":"https://pith.science/pith/EALJAAJJ4IHZVZCPWTKBLECT3P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EALJAAJJ4IHZVZCPWTKBLECT3P/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":"2026-06-03T21:17:46Z","links":{"resolver":"https://pith.science/pith/EALJAAJJ4IHZVZCPWTKBLECT3P","bundle":"https://pith.science/pith/EALJAAJJ4IHZVZCPWTKBLECT3P/bundle.json","state":"https://pith.science/pith/EALJAAJJ4IHZVZCPWTKBLECT3P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EALJAAJJ4IHZVZCPWTKBLECT3P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:EALJAAJJ4IHZVZCPWTKBLECT3P","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":"b3c56db958a0c2120c0762d3e1623fe2ea02440d9911485e27289908f46f6705","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-04T07:55:19Z","title_canon_sha256":"0b4922cba71fcf4e43b17f3c65e4e110ddabaf27128a4263db1e5ba817555f19"},"schema_version":"1.0","source":{"id":"1108.1015","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.1015","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"arxiv_version","alias_value":"1108.1015v1","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.1015","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"pith_short_12","alias_value":"EALJAAJJ4IHZ","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_16","alias_value":"EALJAAJJ4IHZVZCP","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_8","alias_value":"EALJAAJJ","created_at":"2026-05-18T12:26:26Z"}],"graph_snapshots":[{"event_id":"sha256:991b972c403f2550fceae8dcfadc94370552f475ac56eb5f888dffa82e888dc2","target":"graph","created_at":"2026-05-18T02:01:03Z","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":"Aims. We present a study of the distribution of stellar ages in the Orion Nebula Cluster (ONC) based on accurate HST photometry taken from the HST Treasury Program observations of the ONC utilizing the most recent estimate of the cluster's distance (Menten et al. 2007). We investigate the presence of an intrinsic age spread in the region and a possible trend of age with the spatial distribution. Methods. We estimate the extinction and accretion luminosity towards each source by performing synthetic photometry on an empirical calibration of atmospheric models (Da Rio et al. 2010) using the pack","authors_text":"D. R. Soderblom, L. Ricci, M. Reggiani, M. R. Meyer, M. Robberto, N. Da Rio","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-04T07:55:19Z","title":"Quantitative Evidence for an Intrinsic Age Spread in the Orion Nebula Cluster"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.1015","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:deb38a83e425c9aa9cc037f21bd4b73090432599d3b6ed7add74250f3aebac7a","target":"record","created_at":"2026-05-18T02:01:03Z","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":"b3c56db958a0c2120c0762d3e1623fe2ea02440d9911485e27289908f46f6705","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-08-04T07:55:19Z","title_canon_sha256":"0b4922cba71fcf4e43b17f3c65e4e110ddabaf27128a4263db1e5ba817555f19"},"schema_version":"1.0","source":{"id":"1108.1015","kind":"arxiv","version":1}},"canonical_sha256":"2016900129e20f9ae44fb4d4159053dbd332cb8c1468b28139d2733b3333a6a4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2016900129e20f9ae44fb4d4159053dbd332cb8c1468b28139d2733b3333a6a4","first_computed_at":"2026-05-18T02:01:03.069680Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:03.069680Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aNfdXZhlSPD/w5OuDK+gJqEjPAT9UggXhADXPPy+F/osZ/PJTOF+5BTndFMoOoGL6goAjYOKAA1wjIhOn2aQAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:03.070416Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.1015","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:deb38a83e425c9aa9cc037f21bd4b73090432599d3b6ed7add74250f3aebac7a","sha256:991b972c403f2550fceae8dcfadc94370552f475ac56eb5f888dffa82e888dc2"],"state_sha256":"c2650e016d6ca4e32a2b7ffa4d910bfa0b0004db370d90bfe594434abdc93154"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wzoca384qK1Vo1j+zBnCD8VDV6YicGJ6K542nz4e5zbUM6VUe6khIi4xTD5lC6ttLDsoUjHqZ7dMP14antJcAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T21:17:46.119447Z","bundle_sha256":"2a8751a16b8c8b59867204b0d84144c8cf4e53bbed1a2ce42680f1a6fdf93e89"}}