{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1994:JDHA4PGK4ZEHAXOVTXBKL5HHCN","short_pith_number":"pith:JDHA4PGK","canonical_record":{"source":{"id":"astro-ph/9408039","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1994-08-13T09:44:49Z","cross_cats_sorted":[],"title_canon_sha256":"fe824951b8d81ea44dad18370863a2b5c0dce8234c22e752583ff268260bf244","abstract_canon_sha256":"55554ffbd0c8d4bcb3109969afa00b1acacdd5cfe2917c748451a5a980378989"},"schema_version":"1.0"},"canonical_sha256":"48ce0e3ccae648705dd59dc2a5f4e71351907d8b0f621f493b401d0c71c434d3","source":{"kind":"arxiv","id":"astro-ph/9408039","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9408039","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9408039v1","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9408039","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"pith_short_12","alias_value":"JDHA4PGK4ZEH","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"JDHA4PGK4ZEHAXOV","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"JDHA4PGK","created_at":"2026-05-18T12:25:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1994:JDHA4PGK4ZEHAXOVTXBKL5HHCN","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9408039","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1994-08-13T09:44:49Z","cross_cats_sorted":[],"title_canon_sha256":"fe824951b8d81ea44dad18370863a2b5c0dce8234c22e752583ff268260bf244","abstract_canon_sha256":"55554ffbd0c8d4bcb3109969afa00b1acacdd5cfe2917c748451a5a980378989"},"schema_version":"1.0"},"canonical_sha256":"48ce0e3ccae648705dd59dc2a5f4e71351907d8b0f621f493b401d0c71c434d3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:24.416524Z","signature_b64":"xkkK9NYyHdc8Puor6oocf2cnSxhfvu2Sm5nUNhwOgXTih46ToqUSAA82dwMFl9KC3UwZPsgMGlOeoJ+kVZtQAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"48ce0e3ccae648705dd59dc2a5f4e71351907d8b0f621f493b401d0c71c434d3","last_reissued_at":"2026-05-18T01:40:24.415896Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:24.415896Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9408039","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":"2026-05-18T01:40:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FLsXFSH1Y5Gv78VlWPMp7B2SJvPr0W0L8y+tJzRevi4DK1dG+VN6vE03QxN8ZYY4XnzACOgKJEzZ1F2OSyHGBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T16:18:54.650537Z"},"content_sha256":"06f6cef8ec0d5e2bf693f270e05367331e88e930aff8c610bd9a51c0d5c158e0","schema_version":"1.0","event_id":"sha256:06f6cef8ec0d5e2bf693f270e05367331e88e930aff8c610bd9a51c0d5c158e0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1994:JDHA4PGK4ZEHAXOVTXBKL5HHCN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"BD+30 3639: The Infrared Spectrum During Post-AGB Stellar Evolution","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.A. Zijlstra, E. Kruegel, R. Siebenmorgen","submitted_at":"1994-08-13T09:44:49Z","abstract_excerpt":"We present a radiative-transfer calculation which reproduces the infrared spectrum of the planetary nebula BD~+30$^{\\circ}$3639. We calculate the transfer process through absorption and scattering in a spherical-symmetric multi-grain dust shell. The emission of transiently heated particles is taken into account, as well as polycyclic aromatic hydrocarbons. We obtain an acceptable fit to most of the spectrum, including the PAH infrared bands. At submillimetre wavelengths the observed emission is larger than the model predicts, indicating that large dust conglomerates (``f{}luffy grains'') may b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9408039","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":"2026-05-18T01:40:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s1meZgnl/BOP0fXunpqgbKZuZSUNRSoEJaZ+J4Req5VpurCDEo3W/0KILEMW0tjCHhsvDUL4DWVzcVZT836ZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T16:18:54.650871Z"},"content_sha256":"e3d6ab84d7256773a1085beeadf7f96e5b4d7491de1a4577897db9fdbdea2673","schema_version":"1.0","event_id":"sha256:e3d6ab84d7256773a1085beeadf7f96e5b4d7491de1a4577897db9fdbdea2673"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JDHA4PGK4ZEHAXOVTXBKL5HHCN/bundle.json","state_url":"https://pith.science/pith/JDHA4PGK4ZEHAXOVTXBKL5HHCN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JDHA4PGK4ZEHAXOVTXBKL5HHCN/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":"2026-06-30T16:18:54Z","links":{"resolver":"https://pith.science/pith/JDHA4PGK4ZEHAXOVTXBKL5HHCN","bundle":"https://pith.science/pith/JDHA4PGK4ZEHAXOVTXBKL5HHCN/bundle.json","state":"https://pith.science/pith/JDHA4PGK4ZEHAXOVTXBKL5HHCN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JDHA4PGK4ZEHAXOVTXBKL5HHCN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1994:JDHA4PGK4ZEHAXOVTXBKL5HHCN","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":"55554ffbd0c8d4bcb3109969afa00b1acacdd5cfe2917c748451a5a980378989","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1994-08-13T09:44:49Z","title_canon_sha256":"fe824951b8d81ea44dad18370863a2b5c0dce8234c22e752583ff268260bf244"},"schema_version":"1.0","source":{"id":"astro-ph/9408039","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9408039","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9408039v1","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9408039","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"pith_short_12","alias_value":"JDHA4PGK4ZEH","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"JDHA4PGK4ZEHAXOV","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"JDHA4PGK","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:e3d6ab84d7256773a1085beeadf7f96e5b4d7491de1a4577897db9fdbdea2673","target":"graph","created_at":"2026-05-18T01:40:24Z","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 a radiative-transfer calculation which reproduces the infrared spectrum of the planetary nebula BD~+30$^{\\circ}$3639. We calculate the transfer process through absorption and scattering in a spherical-symmetric multi-grain dust shell. The emission of transiently heated particles is taken into account, as well as polycyclic aromatic hydrocarbons. We obtain an acceptable fit to most of the spectrum, including the PAH infrared bands. At submillimetre wavelengths the observed emission is larger than the model predicts, indicating that large dust conglomerates (``f{}luffy grains'') may b","authors_text":"A.A. Zijlstra, E. Kruegel, R. Siebenmorgen","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1994-08-13T09:44:49Z","title":"BD+30 3639: The Infrared Spectrum During Post-AGB Stellar Evolution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9408039","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":"sha256:06f6cef8ec0d5e2bf693f270e05367331e88e930aff8c610bd9a51c0d5c158e0","target":"record","created_at":"2026-05-18T01:40:24Z","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":"55554ffbd0c8d4bcb3109969afa00b1acacdd5cfe2917c748451a5a980378989","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1994-08-13T09:44:49Z","title_canon_sha256":"fe824951b8d81ea44dad18370863a2b5c0dce8234c22e752583ff268260bf244"},"schema_version":"1.0","source":{"id":"astro-ph/9408039","kind":"arxiv","version":1}},"canonical_sha256":"48ce0e3ccae648705dd59dc2a5f4e71351907d8b0f621f493b401d0c71c434d3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"48ce0e3ccae648705dd59dc2a5f4e71351907d8b0f621f493b401d0c71c434d3","first_computed_at":"2026-05-18T01:40:24.415896Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:40:24.415896Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xkkK9NYyHdc8Puor6oocf2cnSxhfvu2Sm5nUNhwOgXTih46ToqUSAA82dwMFl9KC3UwZPsgMGlOeoJ+kVZtQAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:40:24.416524Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9408039","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:06f6cef8ec0d5e2bf693f270e05367331e88e930aff8c610bd9a51c0d5c158e0","sha256:e3d6ab84d7256773a1085beeadf7f96e5b4d7491de1a4577897db9fdbdea2673"],"state_sha256":"100829a73898210c31f73daaff2f2af512d6bd4e6d2ce9c1512360e2864cd22c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rD8ArdlnyqXfd5+gTxbP+nKMKQFMYVSlEp+gTrlDEA4lJCVqHar3QXNoTd9v2dquCnvYEpzmJeuTWcuzwiy2Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-30T16:18:54.652676Z","bundle_sha256":"44a82e718e9bc4997e767294616644977c1526b419131d86e133a3f9fab94005"}}