{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:MMJA42LT3X2N4SAHUAE5SEYQCV","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":"4b22570c120707dc0b6f2b4ef9f8abaac29d33e385bc1ce3e0c510b3ddfc6a06","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-04T20:59:05Z","title_canon_sha256":"9b48e4cc567e9f78a52b064f44c99f2a18d8a07eebae3b905c9986d8f3cc81c2"},"schema_version":"1.0","source":{"id":"0909.0960","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.0960","created_at":"2026-05-18T02:34:31Z"},{"alias_kind":"arxiv_version","alias_value":"0909.0960v1","created_at":"2026-05-18T02:34:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.0960","created_at":"2026-05-18T02:34:31Z"},{"alias_kind":"pith_short_12","alias_value":"MMJA42LT3X2N","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"MMJA42LT3X2N4SAH","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"MMJA42LT","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:bc2f21f732c03217ef6755eeb0e2bbb900582724307c47b32c05f0d24bf07b37","target":"graph","created_at":"2026-05-18T02:34:31Z","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 analyze samples of Spitzer Infrared Spectrograph (IRS) spectra of T Tauri stars in the Ophiuchus, Taurus, and Chamaeleon I star-forming regions, whose median ages lie in the <1 to 2 Myr range. The median mid-infrared spectra of objects in these three regions are similar in shape, suggesting, on average, similar disk structures. When normalized to the same stellar luminosity, the medians follow each other closely, implying comparable mid-infrared excess emission from the circumstellar disks. We use the spectral index between 13 and 31 micron and the equivalent width of the 10 micron silicate","authors_text":"2), (2) JPL, (3) University of Rochester, 4), (4) University of Michigan, (5) UNAM, Ann Arbor, B. A. Sargent (3), CA, Caltech, C. Espaillat (4), D. M. Watson (3), E. Furlan (1, K. H. Kim (3), L. Hartmann (4) ((1) NAI/UCLA, Los Angeles, Mexico), MI, M. K. McClure (3, Morelia, N. Calvet (4), NY, Pasadena, P. D'Alessio (5), P. Manoj (3), Rochester, W. J. Forrest (3)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-04T20:59:05Z","title":"Disk Evolution in the three Nearby Star-Forming Regions of Taurus, Chamaeleon, and Ophiuchus"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.0960","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":"sha256:10714c3e8a0f9fd5b3692498e341157cec53a27445c53e2760f5ee23ad390bdb","target":"record","created_at":"2026-05-18T02:34:31Z","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":"4b22570c120707dc0b6f2b4ef9f8abaac29d33e385bc1ce3e0c510b3ddfc6a06","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-04T20:59:05Z","title_canon_sha256":"9b48e4cc567e9f78a52b064f44c99f2a18d8a07eebae3b905c9986d8f3cc81c2"},"schema_version":"1.0","source":{"id":"0909.0960","kind":"arxiv","version":1}},"canonical_sha256":"63120e6973ddf4de4807a009d91310155fb1c3fa7138b7333957311f930d6aa2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"63120e6973ddf4de4807a009d91310155fb1c3fa7138b7333957311f930d6aa2","first_computed_at":"2026-05-18T02:34:31.028965Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:34:31.028965Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bSsLUhcsYYKwg/Fr3I+wOT12wxQzTFArPGMLQPHEfWg0m0I1MoTTSfYB754kxYsjHmKMbTYxXl4twBCMDYKrBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:34:31.029344Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.0960","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:10714c3e8a0f9fd5b3692498e341157cec53a27445c53e2760f5ee23ad390bdb","sha256:bc2f21f732c03217ef6755eeb0e2bbb900582724307c47b32c05f0d24bf07b37"],"state_sha256":"9dd60e412127d6f25246e0a34d90fb914a606ee3f801d1c37abdf8111afbd340"}