{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:UHVSO6HG2H5WTY37LOJMU6CTHZ","short_pith_number":"pith:UHVSO6HG","canonical_record":{"source":{"id":"2401.06950","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-01-13T02:04:40Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"2448af16f53d419fb180a7acbbe6dcdcf3bce64d2cc7e757037c0b4ca6a3834b","abstract_canon_sha256":"1bf86363728624a5d6ad3ef0df623778ed7e401ffd91e77d925708e58778215a"},"schema_version":"1.0"},"canonical_sha256":"a1eb2778e6d1fb69e37f5b92ca78533e733836f219b9574b366adbfc3de3769e","source":{"kind":"arxiv","id":"2401.06950","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2401.06950","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"arxiv_version","alias_value":"2401.06950v1","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2401.06950","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"pith_short_12","alias_value":"UHVSO6HG2H5W","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"pith_short_16","alias_value":"UHVSO6HG2H5WTY37","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"pith_short_8","alias_value":"UHVSO6HG","created_at":"2026-07-05T07:33:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:UHVSO6HG2H5WTY37LOJMU6CTHZ","target":"record","payload":{"canonical_record":{"source":{"id":"2401.06950","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-01-13T02:04:40Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"2448af16f53d419fb180a7acbbe6dcdcf3bce64d2cc7e757037c0b4ca6a3834b","abstract_canon_sha256":"1bf86363728624a5d6ad3ef0df623778ed7e401ffd91e77d925708e58778215a"},"schema_version":"1.0"},"canonical_sha256":"a1eb2778e6d1fb69e37f5b92ca78533e733836f219b9574b366adbfc3de3769e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:33:28.612407Z","signature_b64":"O2da47n8hrFEXA9MHBfABSrA8h1Gixbe0VIBuunqFVFGtODqYsp37i3ZDPLMl8Ll7Kufctn3W8Sj3SNXEJaECw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a1eb2778e6d1fb69e37f5b92ca78533e733836f219b9574b366adbfc3de3769e","last_reissued_at":"2026-07-05T07:33:28.611969Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:33:28.611969Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2401.06950","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":"2026-07-05T07:33:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"snrapg+Ufv5Jg7LC59Mk0APCd2Ntn0lSemHrloR7Tcc/H3bO2W0Aszpw58KDQnr1FiSl3ZOppdfueQriCiDZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-13T10:56:10.589212Z"},"content_sha256":"4a3972487ddb2576a34dec4d5a31c010b464978a0a5abe80ca780cb5a389e0fd","schema_version":"1.0","event_id":"sha256:4a3972487ddb2576a34dec4d5a31c010b464978a0a5abe80ca780cb5a389e0fd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:UHVSO6HG2H5WTY37LOJMU6CTHZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Silicate Extinction Profile Based on the Stellar Spectrum by Spitzer/IRS","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Biwei Jiang, Zhenzhen Shao","submitted_at":"2024-01-13T02:04:40Z","abstract_excerpt":"The 9.7$\\mu m$ and 18$\\mu m$ interstellar spectral features, arising from the Si--O stretching and O--Si--O bending mode of amorphous silicate dust, are the strongest extinction feature in the infrared. Here we use the \"pair method\" to determine the silicate extinction profile by comparing the \\emph{Spitzer}/IRS spectra of 49 target stars with obvious extinction with that of un-reddened star of the same spectral type. The 9.7$\\mu m$ extinction profile is determined from all the 49 stars and the 18$\\mu m$ profile is determined from six stars. It is found that the profile has the peak wavelength"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2401.06950","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2401.06950/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T07:33:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nXwJ1B4AvSgzaYJPgeLX7djA3HLC2sQ1NK1C5ip/V6118ig6Hd0CPbnqyM4mGe2xKi3TyK/KAPN5YxBqNIMFBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-13T10:56:10.589598Z"},"content_sha256":"45f3d4e0a37296a55e78b1939e4d70282b42e0af103ab397f6b610671c95d808","schema_version":"1.0","event_id":"sha256:45f3d4e0a37296a55e78b1939e4d70282b42e0af103ab397f6b610671c95d808"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UHVSO6HG2H5WTY37LOJMU6CTHZ/bundle.json","state_url":"https://pith.science/pith/UHVSO6HG2H5WTY37LOJMU6CTHZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UHVSO6HG2H5WTY37LOJMU6CTHZ/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":"2026-07-13T10:56:10Z","links":{"resolver":"https://pith.science/pith/UHVSO6HG2H5WTY37LOJMU6CTHZ","bundle":"https://pith.science/pith/UHVSO6HG2H5WTY37LOJMU6CTHZ/bundle.json","state":"https://pith.science/pith/UHVSO6HG2H5WTY37LOJMU6CTHZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UHVSO6HG2H5WTY37LOJMU6CTHZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:UHVSO6HG2H5WTY37LOJMU6CTHZ","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":"1bf86363728624a5d6ad3ef0df623778ed7e401ffd91e77d925708e58778215a","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-01-13T02:04:40Z","title_canon_sha256":"2448af16f53d419fb180a7acbbe6dcdcf3bce64d2cc7e757037c0b4ca6a3834b"},"schema_version":"1.0","source":{"id":"2401.06950","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2401.06950","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"arxiv_version","alias_value":"2401.06950v1","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2401.06950","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"pith_short_12","alias_value":"UHVSO6HG2H5W","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"pith_short_16","alias_value":"UHVSO6HG2H5WTY37","created_at":"2026-07-05T07:33:28Z"},{"alias_kind":"pith_short_8","alias_value":"UHVSO6HG","created_at":"2026-07-05T07:33:28Z"}],"graph_snapshots":[{"event_id":"sha256:45f3d4e0a37296a55e78b1939e4d70282b42e0af103ab397f6b610671c95d808","target":"graph","created_at":"2026-07-05T07:33:28Z","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/2401.06950/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The 9.7$\\mu m$ and 18$\\mu m$ interstellar spectral features, arising from the Si--O stretching and O--Si--O bending mode of amorphous silicate dust, are the strongest extinction feature in the infrared. Here we use the \"pair method\" to determine the silicate extinction profile by comparing the \\emph{Spitzer}/IRS spectra of 49 target stars with obvious extinction with that of un-reddened star of the same spectral type. The 9.7$\\mu m$ extinction profile is determined from all the 49 stars and the 18$\\mu m$ profile is determined from six stars. It is found that the profile has the peak wavelength","authors_text":"Biwei Jiang, Zhenzhen Shao","cross_cats":["astro-ph.GA"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-01-13T02:04:40Z","title":"Silicate Extinction Profile Based on the Stellar Spectrum by Spitzer/IRS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2401.06950","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":"sha256:4a3972487ddb2576a34dec4d5a31c010b464978a0a5abe80ca780cb5a389e0fd","target":"record","created_at":"2026-07-05T07:33:28Z","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":"1bf86363728624a5d6ad3ef0df623778ed7e401ffd91e77d925708e58778215a","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-01-13T02:04:40Z","title_canon_sha256":"2448af16f53d419fb180a7acbbe6dcdcf3bce64d2cc7e757037c0b4ca6a3834b"},"schema_version":"1.0","source":{"id":"2401.06950","kind":"arxiv","version":1}},"canonical_sha256":"a1eb2778e6d1fb69e37f5b92ca78533e733836f219b9574b366adbfc3de3769e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a1eb2778e6d1fb69e37f5b92ca78533e733836f219b9574b366adbfc3de3769e","first_computed_at":"2026-07-05T07:33:28.611969Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:33:28.611969Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"O2da47n8hrFEXA9MHBfABSrA8h1Gixbe0VIBuunqFVFGtODqYsp37i3ZDPLMl8Ll7Kufctn3W8Sj3SNXEJaECw==","signature_status":"signed_v1","signed_at":"2026-07-05T07:33:28.612407Z","signed_message":"canonical_sha256_bytes"},"source_id":"2401.06950","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4a3972487ddb2576a34dec4d5a31c010b464978a0a5abe80ca780cb5a389e0fd","sha256:45f3d4e0a37296a55e78b1939e4d70282b42e0af103ab397f6b610671c95d808"],"state_sha256":"a4c7d5144e0b09cf6812e75942a41825e80adef69446bc6e70ad5edc8d9c2bf1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sw7beZNp0qOhjRxgRoDGeW+yrLFVUsYTwexRDkU19LImVXkE4GoVFjPz04dzr+1KLgTlj96H07knbpfE6GV8Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-13T10:56:10.591618Z","bundle_sha256":"0d258c0ccae3f90a140b0c229cbabf21f1ec1cc77c6e8dd53d5e8ce432f83312"}}