{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:6IY74NRVDRLXSLBHTZDGGA4OPY","short_pith_number":"pith:6IY74NRV","canonical_record":{"source":{"id":"2007.02942","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2020-07-06T18:00:00Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"title_canon_sha256":"7e03bb8083d74e33ce71d1ff0f3ef68078c4fca4cc9b018dcc3594e4279a4792","abstract_canon_sha256":"5a26f0b61ec1a5553b5db5091136b1478b754d02e8fcb010111c40c058154af2"},"schema_version":"1.0"},"canonical_sha256":"f231fe36351c57792c279e4663038e7e0996dd6c23b5d94173c2341150a3dd7e","source":{"kind":"arxiv","id":"2007.02942","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2007.02942","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"arxiv_version","alias_value":"2007.02942v1","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2007.02942","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"pith_short_12","alias_value":"6IY74NRVDRLX","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"pith_short_16","alias_value":"6IY74NRVDRLXSLBH","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"pith_short_8","alias_value":"6IY74NRV","created_at":"2026-07-05T01:24:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:6IY74NRVDRLXSLBHTZDGGA4OPY","target":"record","payload":{"canonical_record":{"source":{"id":"2007.02942","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2020-07-06T18:00:00Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"title_canon_sha256":"7e03bb8083d74e33ce71d1ff0f3ef68078c4fca4cc9b018dcc3594e4279a4792","abstract_canon_sha256":"5a26f0b61ec1a5553b5db5091136b1478b754d02e8fcb010111c40c058154af2"},"schema_version":"1.0"},"canonical_sha256":"f231fe36351c57792c279e4663038e7e0996dd6c23b5d94173c2341150a3dd7e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:24:38.774803Z","signature_b64":"x2kV2vJQiBIm2lc3B85Hbn6vHnEfkRS1wV7sZeZvs/669SYZTEOnhecuWSN6RrFTZVCn6dzKggjK3DdjJO6FAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f231fe36351c57792c279e4663038e7e0996dd6c23b5d94173c2341150a3dd7e","last_reissued_at":"2026-07-05T01:24:38.774396Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:24:38.774396Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2007.02942","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":"2026-07-05T01:24:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DOGJ+Or7dtiDUILAwFS9XF6CtNXVH3IwzqMizwr/yWd8cnjwKBn9TuPEPmfBLkyrvYaGWgQt1qobEO28qJD0Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T23:14:52.475021Z"},"content_sha256":"b5041be6861a7eb7ee81410228a4865b2a5de1d94da525cfc7e2762cd2f6745a","schema_version":"1.0","event_id":"sha256:b5041be6861a7eb7ee81410228a4865b2a5de1d94da525cfc7e2762cd2f6745a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:6IY74NRVDRLXSLBHTZDGGA4OPY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stellar Characterization of Keck HIRES Spectra with The Cannon","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"John Brewer, Malena Rice","submitted_at":"2020-07-06T18:00:00Z","abstract_excerpt":"To accurately interpret the observed properties of exoplanets, it is necessary to first obtain a detailed understanding of host star properties. However, physical models that analyze stellar properties on a per-star basis can become computationally intractable for sufficiently large samples. Furthermore, these models are limited by the wavelength coverage of available spectra. We combine previously derived spectral properties from the Spectroscopic Properties of Cool Stars (SPOCS) catalog (Brewer et al. 2016) with generative modeling using The Cannon to produce a model capable of deriving stel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2007.02942","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/2007.02942/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":"2026-07-05T01:24:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mnmqkow3LVorFYVDKsx2I2u46ItYLehr1iBipLD1nFR2Vz8nOdI4egsV4XZ6nTKzcJJSc4YQT4i8UlAzfUZsCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T23:14:52.475527Z"},"content_sha256":"adb2fab405adba712610699f1bf136578b8766f47eb370a759b051f47ba11a62","schema_version":"1.0","event_id":"sha256:adb2fab405adba712610699f1bf136578b8766f47eb370a759b051f47ba11a62"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6IY74NRVDRLXSLBHTZDGGA4OPY/bundle.json","state_url":"https://pith.science/pith/6IY74NRVDRLXSLBHTZDGGA4OPY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6IY74NRVDRLXSLBHTZDGGA4OPY/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":"2026-08-03T23:14:52Z","links":{"resolver":"https://pith.science/pith/6IY74NRVDRLXSLBHTZDGGA4OPY","bundle":"https://pith.science/pith/6IY74NRVDRLXSLBHTZDGGA4OPY/bundle.json","state":"https://pith.science/pith/6IY74NRVDRLXSLBHTZDGGA4OPY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6IY74NRVDRLXSLBHTZDGGA4OPY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:6IY74NRVDRLXSLBHTZDGGA4OPY","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":"5a26f0b61ec1a5553b5db5091136b1478b754d02e8fcb010111c40c058154af2","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2020-07-06T18:00:00Z","title_canon_sha256":"7e03bb8083d74e33ce71d1ff0f3ef68078c4fca4cc9b018dcc3594e4279a4792"},"schema_version":"1.0","source":{"id":"2007.02942","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2007.02942","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"arxiv_version","alias_value":"2007.02942v1","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2007.02942","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"pith_short_12","alias_value":"6IY74NRVDRLX","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"pith_short_16","alias_value":"6IY74NRVDRLXSLBH","created_at":"2026-07-05T01:24:38Z"},{"alias_kind":"pith_short_8","alias_value":"6IY74NRV","created_at":"2026-07-05T01:24:38Z"}],"graph_snapshots":[{"event_id":"sha256:adb2fab405adba712610699f1bf136578b8766f47eb370a759b051f47ba11a62","target":"graph","created_at":"2026-07-05T01:24:38Z","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/2007.02942/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"To accurately interpret the observed properties of exoplanets, it is necessary to first obtain a detailed understanding of host star properties. However, physical models that analyze stellar properties on a per-star basis can become computationally intractable for sufficiently large samples. Furthermore, these models are limited by the wavelength coverage of available spectra. We combine previously derived spectral properties from the Spectroscopic Properties of Cool Stars (SPOCS) catalog (Brewer et al. 2016) with generative modeling using The Cannon to produce a model capable of deriving stel","authors_text":"John Brewer, Malena Rice","cross_cats":["astro-ph.IM","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2020-07-06T18:00:00Z","title":"Stellar Characterization of Keck HIRES Spectra with The Cannon"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2007.02942","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:b5041be6861a7eb7ee81410228a4865b2a5de1d94da525cfc7e2762cd2f6745a","target":"record","created_at":"2026-07-05T01:24:38Z","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":"5a26f0b61ec1a5553b5db5091136b1478b754d02e8fcb010111c40c058154af2","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2020-07-06T18:00:00Z","title_canon_sha256":"7e03bb8083d74e33ce71d1ff0f3ef68078c4fca4cc9b018dcc3594e4279a4792"},"schema_version":"1.0","source":{"id":"2007.02942","kind":"arxiv","version":1}},"canonical_sha256":"f231fe36351c57792c279e4663038e7e0996dd6c23b5d94173c2341150a3dd7e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f231fe36351c57792c279e4663038e7e0996dd6c23b5d94173c2341150a3dd7e","first_computed_at":"2026-07-05T01:24:38.774396Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:24:38.774396Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x2kV2vJQiBIm2lc3B85Hbn6vHnEfkRS1wV7sZeZvs/669SYZTEOnhecuWSN6RrFTZVCn6dzKggjK3DdjJO6FAA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:24:38.774803Z","signed_message":"canonical_sha256_bytes"},"source_id":"2007.02942","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b5041be6861a7eb7ee81410228a4865b2a5de1d94da525cfc7e2762cd2f6745a","sha256:adb2fab405adba712610699f1bf136578b8766f47eb370a759b051f47ba11a62"],"state_sha256":"9d8f73c8773c062686ed858bab967a6ee16939b2a95bd3e42ffd206b55915243"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ielXXGq4MEelgJYoPsM/QI9LfTRBkOC/GgcUROiE0iC6YCTHbdeOD9SBWgwmSjHXMYYmKlC5dst/eiqxwDEuBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T23:14:52.478876Z","bundle_sha256":"ce672e0d411305fcca62b571e36973b97a28d0af9829a5025cac66d5e357aac0"}}