{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:HDSXIE4QGXVWNGQYW4DYAHKUNU","short_pith_number":"pith:HDSXIE4Q","canonical_record":{"source":{"id":"2410.14751","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-10-17T23:35:21Z","cross_cats_sorted":["astro-ph.EP","astro-ph.SR"],"title_canon_sha256":"24bcc59160517e3b75ff1008c398c7703be2166d84407ef3e0fc8b1111669391","abstract_canon_sha256":"d92a2e6cc7478edd23e5936a9d97a9928ed63b549529a7f344b9142d0d8f4457"},"schema_version":"1.0"},"canonical_sha256":"38e574139035eb669a18b707801d546d1da3df4168af4076dcd3d5a0b01973b8","source":{"kind":"arxiv","id":"2410.14751","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2410.14751","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"arxiv_version","alias_value":"2410.14751v1","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2410.14751","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"pith_short_12","alias_value":"HDSXIE4QGXVW","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"pith_short_16","alias_value":"HDSXIE4QGXVWNGQY","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"pith_short_8","alias_value":"HDSXIE4Q","created_at":"2026-07-05T09:22:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:HDSXIE4QGXVWNGQYW4DYAHKUNU","target":"record","payload":{"canonical_record":{"source":{"id":"2410.14751","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-10-17T23:35:21Z","cross_cats_sorted":["astro-ph.EP","astro-ph.SR"],"title_canon_sha256":"24bcc59160517e3b75ff1008c398c7703be2166d84407ef3e0fc8b1111669391","abstract_canon_sha256":"d92a2e6cc7478edd23e5936a9d97a9928ed63b549529a7f344b9142d0d8f4457"},"schema_version":"1.0"},"canonical_sha256":"38e574139035eb669a18b707801d546d1da3df4168af4076dcd3d5a0b01973b8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:22:44.564283Z","signature_b64":"Pgv/kkpma/UxBldpmzhuZfLuNWcl4t7PKL/YZ4gerT7HiEQTXHP401YqfiesGDTv4TI+mW17Fe8Y1pWYZSZJDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"38e574139035eb669a18b707801d546d1da3df4168af4076dcd3d5a0b01973b8","last_reissued_at":"2026-07-05T09:22:44.563854Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:22:44.563854Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2410.14751","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":"2026-07-05T09:22:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BbXk+QTO7mC9hCahs0si2NP7KfusxOBracbegVHA5QvjNLpQkoxlgWx4RqEM+xSOPM3CSj0i5eb4hHB3ofVPBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T09:57:44.700012Z"},"content_sha256":"ab986b49d77279b7c9102393521ec7a88632439da43bc10d6617885d089f4af3","schema_version":"1.0","event_id":"sha256:ab986b49d77279b7c9102393521ec7a88632439da43bc10d6617885d089f4af3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:HDSXIE4QGXVWNGQYW4DYAHKUNU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cthulhu: An Open Source Molecular and Atomic Cross Section Computation Code for Substellar Atmospheres","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.EP","astro-ph.SR"],"primary_cat":"astro-ph.IM","authors_text":"Arnav Agrawal, Ryan J. MacDonald","submitted_at":"2024-10-17T23:35:21Z","abstract_excerpt":"Atmospheric studies of exoplanets and brown dwarfs are a cutting-edge and rapidly evolving area of astrophysics research. Calculating models of exoplanet or brown dwarf spectra requires knowledge of the wavelength-dependent absorption of light (cross sections) by the molecules and atoms in the atmosphere. Here we introduce Cthulhu, a pure Python package that rapidly calculates cross sections from atomic and molecular line lists. Cthulhu includes modules to automatically download molecular line lists from online databases (e.g. ExoMol and HITRAN) and compute cross sections on a user-specified t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2410.14751","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/2410.14751/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":"2026-07-05T09:22:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qZxzlMpbnUfjTy7NzR24XcZ8BkQpgKouDz2bOld9P1BR+COfv9SJWDTlkD0oh5/R144i8r+KfDSW5AbQbVVxBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T09:57:44.700543Z"},"content_sha256":"5c6e25da5c46490a5239b0a998a2e5fb2b0ff7f7f9caffc163afc6a95a20f3ad","schema_version":"1.0","event_id":"sha256:5c6e25da5c46490a5239b0a998a2e5fb2b0ff7f7f9caffc163afc6a95a20f3ad"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HDSXIE4QGXVWNGQYW4DYAHKUNU/bundle.json","state_url":"https://pith.science/pith/HDSXIE4QGXVWNGQYW4DYAHKUNU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HDSXIE4QGXVWNGQYW4DYAHKUNU/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":"2026-08-18T09:57:44Z","links":{"resolver":"https://pith.science/pith/HDSXIE4QGXVWNGQYW4DYAHKUNU","bundle":"https://pith.science/pith/HDSXIE4QGXVWNGQYW4DYAHKUNU/bundle.json","state":"https://pith.science/pith/HDSXIE4QGXVWNGQYW4DYAHKUNU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HDSXIE4QGXVWNGQYW4DYAHKUNU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:HDSXIE4QGXVWNGQYW4DYAHKUNU","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":"d92a2e6cc7478edd23e5936a9d97a9928ed63b549529a7f344b9142d0d8f4457","cross_cats_sorted":["astro-ph.EP","astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-10-17T23:35:21Z","title_canon_sha256":"24bcc59160517e3b75ff1008c398c7703be2166d84407ef3e0fc8b1111669391"},"schema_version":"1.0","source":{"id":"2410.14751","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2410.14751","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"arxiv_version","alias_value":"2410.14751v1","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2410.14751","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"pith_short_12","alias_value":"HDSXIE4QGXVW","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"pith_short_16","alias_value":"HDSXIE4QGXVWNGQY","created_at":"2026-07-05T09:22:44Z"},{"alias_kind":"pith_short_8","alias_value":"HDSXIE4Q","created_at":"2026-07-05T09:22:44Z"}],"graph_snapshots":[{"event_id":"sha256:5c6e25da5c46490a5239b0a998a2e5fb2b0ff7f7f9caffc163afc6a95a20f3ad","target":"graph","created_at":"2026-07-05T09:22:44Z","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/2410.14751/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Atmospheric studies of exoplanets and brown dwarfs are a cutting-edge and rapidly evolving area of astrophysics research. Calculating models of exoplanet or brown dwarf spectra requires knowledge of the wavelength-dependent absorption of light (cross sections) by the molecules and atoms in the atmosphere. Here we introduce Cthulhu, a pure Python package that rapidly calculates cross sections from atomic and molecular line lists. Cthulhu includes modules to automatically download molecular line lists from online databases (e.g. ExoMol and HITRAN) and compute cross sections on a user-specified t","authors_text":"Arnav Agrawal, Ryan J. MacDonald","cross_cats":["astro-ph.EP","astro-ph.SR"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-10-17T23:35:21Z","title":"Cthulhu: An Open Source Molecular and Atomic Cross Section Computation Code for Substellar Atmospheres"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2410.14751","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:ab986b49d77279b7c9102393521ec7a88632439da43bc10d6617885d089f4af3","target":"record","created_at":"2026-07-05T09:22:44Z","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":"d92a2e6cc7478edd23e5936a9d97a9928ed63b549529a7f344b9142d0d8f4457","cross_cats_sorted":["astro-ph.EP","astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-10-17T23:35:21Z","title_canon_sha256":"24bcc59160517e3b75ff1008c398c7703be2166d84407ef3e0fc8b1111669391"},"schema_version":"1.0","source":{"id":"2410.14751","kind":"arxiv","version":1}},"canonical_sha256":"38e574139035eb669a18b707801d546d1da3df4168af4076dcd3d5a0b01973b8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"38e574139035eb669a18b707801d546d1da3df4168af4076dcd3d5a0b01973b8","first_computed_at":"2026-07-05T09:22:44.563854Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:22:44.563854Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Pgv/kkpma/UxBldpmzhuZfLuNWcl4t7PKL/YZ4gerT7HiEQTXHP401YqfiesGDTv4TI+mW17Fe8Y1pWYZSZJDg==","signature_status":"signed_v1","signed_at":"2026-07-05T09:22:44.564283Z","signed_message":"canonical_sha256_bytes"},"source_id":"2410.14751","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ab986b49d77279b7c9102393521ec7a88632439da43bc10d6617885d089f4af3","sha256:5c6e25da5c46490a5239b0a998a2e5fb2b0ff7f7f9caffc163afc6a95a20f3ad"],"state_sha256":"66f55b00164f043df39b10120e5fc98c4700e33097df3fd858c30230081222cb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"agzLnmp1vtfcwgXmSN5Rk4zHMRe8YXveBvTASlBhiAn+Fvr5dbMimwRo3iA5Tawn1/2cMYdi0zCCyLHvhImmDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T09:57:44.705837Z","bundle_sha256":"2abcca84b438e92e10cce9aab01ef74bcce4bd9e4c40184c222093291def8c98"}}