{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:BO5UVJ4Q55FJT2EQ2SVXSZLJCE","short_pith_number":"pith:BO5UVJ4Q","canonical_record":{"source":{"id":"0812.2016","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-10T20:35:10Z","cross_cats_sorted":[],"title_canon_sha256":"9d8ee5fea3a6ebb51e87a276fa87e7582addb5b72c3788357eab50314a3197f5","abstract_canon_sha256":"0e6886d819eda3a975bf991118749d352927096b56ba7e8b4d4ca5bd4d926266"},"schema_version":"1.0"},"canonical_sha256":"0bbb4aa790ef4a99e890d4ab796569110cf639c7db5afbf4417d172e3b8e0632","source":{"kind":"arxiv","id":"0812.2016","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.2016","created_at":"2026-05-18T02:35:13Z"},{"alias_kind":"arxiv_version","alias_value":"0812.2016v2","created_at":"2026-05-18T02:35:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.2016","created_at":"2026-05-18T02:35:13Z"},{"alias_kind":"pith_short_12","alias_value":"BO5UVJ4Q55FJ","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"BO5UVJ4Q55FJT2EQ","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"BO5UVJ4Q","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:BO5UVJ4Q55FJT2EQ2SVXSZLJCE","target":"record","payload":{"canonical_record":{"source":{"id":"0812.2016","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-10T20:35:10Z","cross_cats_sorted":[],"title_canon_sha256":"9d8ee5fea3a6ebb51e87a276fa87e7582addb5b72c3788357eab50314a3197f5","abstract_canon_sha256":"0e6886d819eda3a975bf991118749d352927096b56ba7e8b4d4ca5bd4d926266"},"schema_version":"1.0"},"canonical_sha256":"0bbb4aa790ef4a99e890d4ab796569110cf639c7db5afbf4417d172e3b8e0632","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:35:13.425420Z","signature_b64":"znfCOibHKNE1rpJM/IpiMtsLsRS/zgUop9L6uvHx//f6IhFPUvomZfJ0QyJuregOQwkxsvO+nDlxXMxowzHaCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0bbb4aa790ef4a99e890d4ab796569110cf639c7db5afbf4417d172e3b8e0632","last_reissued_at":"2026-05-18T02:35:13.424978Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:35:13.424978Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0812.2016","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:35:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"djhQ2KMAJX6x6ASQjly3VrlKBO4Tm/UvixMTjeHb9qUr/Ru2NbM79p+PoPL6r6rkiWNjZRiqA0BYcV8HV2ttAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T18:10:41.203574Z"},"content_sha256":"01cc75674263230d47da21a1880b4561aa853c8300c9b24b443491314265303a","schema_version":"1.0","event_id":"sha256:01cc75674263230d47da21a1880b4561aa853c8300c9b24b443491314265303a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:BO5UVJ4Q55FJT2EQ2SVXSZLJCE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Toward understanding the 3.4 micron and 9.7 micron extinction feature variations from the local diffuse interstellar medium to the Galactic center","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2), Aigen Li (2) ((1) Beijing Normal University, Beijing, B. W. Jiang (1), China; (2) University of Missouri, Columbia, Jian Gao (1, MO, USA)","submitted_at":"2008-12-10T20:35:10Z","abstract_excerpt":"Observationally, both the 3.4micron aliphatic hydrocarbon C--H stretching absorption feature and the 9.7micron amorphous silicate Si--O stretching absorption feature show considerable variations from the local diffuse interstellar medium (ISM) to Galactic center (GC): both the ratio of the visual extinction (A_V) to the 9.7micron Si--O optical depth (\\tausil) and the ratio of A_V to the 3.4micron C--H optical depth (\\tauahc) of the solar neighborhood local diffuse ISM are about twice as much as that of the GC. In this work, we try to explain these variations in terms of a porous dust model con"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.2016","kind":"arxiv","version":2},"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":"2026-05-18T02:35:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c9d7roUqisyFPAG4yD9g2E/2Urv+48CgEssGZeK+EA0d31Ru1wi2rPtkqNRXrhN8H4zrfPGAzcw+SBlQIqmJCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T18:10:41.204224Z"},"content_sha256":"8cfc44d277f84adf6220ee7f8d67e24d0017fd7df1c185c5eb24b81e69cfcae7","schema_version":"1.0","event_id":"sha256:8cfc44d277f84adf6220ee7f8d67e24d0017fd7df1c185c5eb24b81e69cfcae7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BO5UVJ4Q55FJT2EQ2SVXSZLJCE/bundle.json","state_url":"https://pith.science/pith/BO5UVJ4Q55FJT2EQ2SVXSZLJCE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BO5UVJ4Q55FJT2EQ2SVXSZLJCE/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":"2026-05-23T18:10:41Z","links":{"resolver":"https://pith.science/pith/BO5UVJ4Q55FJT2EQ2SVXSZLJCE","bundle":"https://pith.science/pith/BO5UVJ4Q55FJT2EQ2SVXSZLJCE/bundle.json","state":"https://pith.science/pith/BO5UVJ4Q55FJT2EQ2SVXSZLJCE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BO5UVJ4Q55FJT2EQ2SVXSZLJCE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:BO5UVJ4Q55FJT2EQ2SVXSZLJCE","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":"0e6886d819eda3a975bf991118749d352927096b56ba7e8b4d4ca5bd4d926266","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-10T20:35:10Z","title_canon_sha256":"9d8ee5fea3a6ebb51e87a276fa87e7582addb5b72c3788357eab50314a3197f5"},"schema_version":"1.0","source":{"id":"0812.2016","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.2016","created_at":"2026-05-18T02:35:13Z"},{"alias_kind":"arxiv_version","alias_value":"0812.2016v2","created_at":"2026-05-18T02:35:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.2016","created_at":"2026-05-18T02:35:13Z"},{"alias_kind":"pith_short_12","alias_value":"BO5UVJ4Q55FJ","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"BO5UVJ4Q55FJT2EQ","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"BO5UVJ4Q","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:8cfc44d277f84adf6220ee7f8d67e24d0017fd7df1c185c5eb24b81e69cfcae7","target":"graph","created_at":"2026-05-18T02:35:13Z","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":"Observationally, both the 3.4micron aliphatic hydrocarbon C--H stretching absorption feature and the 9.7micron amorphous silicate Si--O stretching absorption feature show considerable variations from the local diffuse interstellar medium (ISM) to Galactic center (GC): both the ratio of the visual extinction (A_V) to the 9.7micron Si--O optical depth (\\tausil) and the ratio of A_V to the 3.4micron C--H optical depth (\\tauahc) of the solar neighborhood local diffuse ISM are about twice as much as that of the GC. In this work, we try to explain these variations in terms of a porous dust model con","authors_text":"2), Aigen Li (2) ((1) Beijing Normal University, Beijing, B. W. Jiang (1), China; (2) University of Missouri, Columbia, Jian Gao (1, MO, USA)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-10T20:35:10Z","title":"Toward understanding the 3.4 micron and 9.7 micron extinction feature variations from the local diffuse interstellar medium to the Galactic center"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.2016","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":"sha256:01cc75674263230d47da21a1880b4561aa853c8300c9b24b443491314265303a","target":"record","created_at":"2026-05-18T02:35:13Z","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":"0e6886d819eda3a975bf991118749d352927096b56ba7e8b4d4ca5bd4d926266","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-10T20:35:10Z","title_canon_sha256":"9d8ee5fea3a6ebb51e87a276fa87e7582addb5b72c3788357eab50314a3197f5"},"schema_version":"1.0","source":{"id":"0812.2016","kind":"arxiv","version":2}},"canonical_sha256":"0bbb4aa790ef4a99e890d4ab796569110cf639c7db5afbf4417d172e3b8e0632","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0bbb4aa790ef4a99e890d4ab796569110cf639c7db5afbf4417d172e3b8e0632","first_computed_at":"2026-05-18T02:35:13.424978Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:35:13.424978Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"znfCOibHKNE1rpJM/IpiMtsLsRS/zgUop9L6uvHx//f6IhFPUvomZfJ0QyJuregOQwkxsvO+nDlxXMxowzHaCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:35:13.425420Z","signed_message":"canonical_sha256_bytes"},"source_id":"0812.2016","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:01cc75674263230d47da21a1880b4561aa853c8300c9b24b443491314265303a","sha256:8cfc44d277f84adf6220ee7f8d67e24d0017fd7df1c185c5eb24b81e69cfcae7"],"state_sha256":"5ab89298357987737e03f903184255923b40ae2691d93ccf354bf9554ee81fa2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AU5OfcGZxNokaqJ5mu3IFskMJbms7yuDrVlbkyKBskXvkDBWA03psVVgJIQ+W21HqHp8Kmc6PnjZhPSYgmD9Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T18:10:41.207822Z","bundle_sha256":"f5d4b297c93782c5cbe71bddd0f99ab631e2c16005df83b5b67c344e198eab17"}}