{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:GRPO3KL65HHA37XRFE7QAPQ2E3","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":"4377c17dee563c48773ac13497b9ee5e55921d4bbfa8331867afa7d9c9884585","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-03-07T22:12:28Z","title_canon_sha256":"93be6a683187bf857e68ef60c983ef1e5db79ccd7db1e53acf2362f8988045eb"},"schema_version":"1.0","source":{"id":"1203.1646","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.1646","created_at":"2026-05-18T03:56:59Z"},{"alias_kind":"arxiv_version","alias_value":"1203.1646v1","created_at":"2026-05-18T03:56:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.1646","created_at":"2026-05-18T03:56:59Z"},{"alias_kind":"pith_short_12","alias_value":"GRPO3KL65HHA","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"GRPO3KL65HHA37XR","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"GRPO3KL6","created_at":"2026-05-18T12:27:06Z"}],"graph_snapshots":[{"event_id":"sha256:b7bffa9277bfb80df50e011e1cdfbaa7b16cefbc04afb720650157975c9cff1b","target":"graph","created_at":"2026-05-18T03:56:59Z","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 present the analysis of an IRS 5-38 {\\mu}m spectrum and MIPS photometric measurements of an infrared echo near the Cassiopeia A supernova remnant observed with the Spitzer Space Telescope. We have modeled the recorded echo accounting for PAHs, quantum-heated carbon and silicate grains, as well as thermal carbon and silicate particles. Using the fact that optical light echo spectroscopy has established that Cas A originated from a type IIb supernova explosion showing an optical spectrum remarkably similar to the prototypical type IIb SN 1993J, we use the latter to construct template data inp","authors_text":"Cornelis P. Dullemond, Fr\\'ed\\'eric P.A. Vogt, Marc-Andr\\'e Besel, Oliver Krause","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-03-07T22:12:28Z","title":"Probing Interstellar Dust with Infrared Echoes from the Cas A Supernova"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.1646","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":"sha256:16386a92d3161018b380fa38e972ecc9499bce8ca86f19edfd7ffd3aa02fae24","target":"record","created_at":"2026-05-18T03:56:59Z","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":"4377c17dee563c48773ac13497b9ee5e55921d4bbfa8331867afa7d9c9884585","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-03-07T22:12:28Z","title_canon_sha256":"93be6a683187bf857e68ef60c983ef1e5db79ccd7db1e53acf2362f8988045eb"},"schema_version":"1.0","source":{"id":"1203.1646","kind":"arxiv","version":1}},"canonical_sha256":"345eeda97ee9ce0dfef1293f003e1a26f0c8f043eee90418657dfbc5d1006aff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"345eeda97ee9ce0dfef1293f003e1a26f0c8f043eee90418657dfbc5d1006aff","first_computed_at":"2026-05-18T03:56:59.868899Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:56:59.868899Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"q3ckK6U37/cUr5PdLelh8jXRmlWpuJF/s7ruxZbJYjhpVfPto1EisUjOj1olcginfeI+zrjB3GdBv+hL+WJbCg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:56:59.869616Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.1646","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:16386a92d3161018b380fa38e972ecc9499bce8ca86f19edfd7ffd3aa02fae24","sha256:b7bffa9277bfb80df50e011e1cdfbaa7b16cefbc04afb720650157975c9cff1b"],"state_sha256":"eb5391b137cb4ff5a7d7c224244e65e0079bec8f70ce041fba78c1dafd1a814d"}