{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:P3IAV2DW7MEIDKZHBR72XQRAEV","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":"c8fb7c9fa8f27e824d885bf2be8416e603ac4c7c221bf826083746efdd20f05c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-08-21T01:55:18Z","title_canon_sha256":"c74af6fe134d4c7096b1c99a876df1b7d5d3cd14013193e267287f6b903b0bb1"},"schema_version":"1.0","source":{"id":"2508.15161","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.15161","created_at":"2026-07-05T11:58:36Z"},{"alias_kind":"arxiv_version","alias_value":"2508.15161v2","created_at":"2026-07-05T11:58:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.15161","created_at":"2026-07-05T11:58:36Z"},{"alias_kind":"pith_short_12","alias_value":"P3IAV2DW7MEI","created_at":"2026-07-05T11:58:36Z"},{"alias_kind":"pith_short_16","alias_value":"P3IAV2DW7MEIDKZH","created_at":"2026-07-05T11:58:36Z"},{"alias_kind":"pith_short_8","alias_value":"P3IAV2DW","created_at":"2026-07-05T11:58:36Z"}],"graph_snapshots":[{"event_id":"sha256:3b0811b8bcbfdc264d13a29b7335b0e06bb05fbeb65c6c7e6fc2b7658e10cc80","target":"graph","created_at":"2026-07-05T11:58:36Z","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/2508.15161/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The young neutron star (NS) in the Cassiopeia A (Cas A) supernova remnant is a fascinating test for theories of NS cooling. Chandra observations have indicated that its surface temperature is declining rapidly, about 2% per decade, using 20 years of data, if a uniform carbon atmosphere is assumed for the NS. This rapid decline may be caused by the neutrons in the NS core transitioning from a normal to a superfluid state. However, most of the Cas A NS observations were performed by the Chandra ACIS detectors, which suffer complicated systematic effects. Here, we test the cooling of the Cas A NS","authors_text":"Craig O. Heinke, Daniel Patnaude, Dmitry D. Ofengeim, Jiaqi Zhao, Peter S. Shternin, Wynn C. G. Ho","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-08-21T01:55:18Z","title":"Verification of Cas A neutron star cooling rate using Chandra HRC-S observations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.15161","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":"sha256:6e89e72429b0acabf8cee14a736dc34f24a230347e5d1de7c76d2c00e83309da","target":"record","created_at":"2026-07-05T11:58:36Z","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":"c8fb7c9fa8f27e824d885bf2be8416e603ac4c7c221bf826083746efdd20f05c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-08-21T01:55:18Z","title_canon_sha256":"c74af6fe134d4c7096b1c99a876df1b7d5d3cd14013193e267287f6b903b0bb1"},"schema_version":"1.0","source":{"id":"2508.15161","kind":"arxiv","version":2}},"canonical_sha256":"7ed00ae876fb0881ab270c7fabc220256b8816b29dab0e07d626667c27ca7046","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7ed00ae876fb0881ab270c7fabc220256b8816b29dab0e07d626667c27ca7046","first_computed_at":"2026-07-05T11:58:36.016561Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:58:36.016561Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Rwe2fxB2pF+/EycnL9X9cNIcbauqT58VX+m7zzftf9i8Vze5IP+0YY4DDkJEyFnSFSplsKRY6L/LxbknRPgSBg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:58:36.017102Z","signed_message":"canonical_sha256_bytes"},"source_id":"2508.15161","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6e89e72429b0acabf8cee14a736dc34f24a230347e5d1de7c76d2c00e83309da","sha256:3b0811b8bcbfdc264d13a29b7335b0e06bb05fbeb65c6c7e6fc2b7658e10cc80"],"state_sha256":"926b4b39062bf0e7a334182dbd4f8c1c4add90fb76b5fc973de3f72ab98588ca"}