{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:ZW4GCAUFA45WRRIOAMKQSU372R","short_pith_number":"pith:ZW4GCAUF","canonical_record":{"source":{"id":"2607.11728","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-07-13T15:54:49Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"bf71ab32f8bab3827dfd8007cfcfdcc473f96837f80b80978559105d7d197ab3","abstract_canon_sha256":"8541fe523b2a8c8a6f43a30d204615e68ba463d409e77575c15313cafd4af8f9"},"schema_version":"1.0"},"canonical_sha256":"cdb8610285073b68c50e031509537fd4585315430a7a9643eabcb32bec56ee0b","source":{"kind":"arxiv","id":"2607.11728","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.11728","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"arxiv_version","alias_value":"2607.11728v1","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.11728","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"pith_short_12","alias_value":"ZW4GCAUFA45W","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"pith_short_16","alias_value":"ZW4GCAUFA45WRRIO","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"pith_short_8","alias_value":"ZW4GCAUF","created_at":"2026-07-14T02:22:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:ZW4GCAUFA45WRRIOAMKQSU372R","target":"record","payload":{"canonical_record":{"source":{"id":"2607.11728","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-07-13T15:54:49Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"bf71ab32f8bab3827dfd8007cfcfdcc473f96837f80b80978559105d7d197ab3","abstract_canon_sha256":"8541fe523b2a8c8a6f43a30d204615e68ba463d409e77575c15313cafd4af8f9"},"schema_version":"1.0"},"canonical_sha256":"cdb8610285073b68c50e031509537fd4585315430a7a9643eabcb32bec56ee0b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-14T02:22:21.406873Z","signature_b64":"DlAMCxRRW/ldEF7i/1evMi3FFuR0WxzTousYr6zWeyXRvKfIAGDgSNmXE6Rm+RkWEfY1eJV5sgDIfUAPAyb9DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cdb8610285073b68c50e031509537fd4585315430a7a9643eabcb32bec56ee0b","last_reissued_at":"2026-07-14T02:22:21.404302Z","signature_status":"signed_v1","first_computed_at":"2026-07-14T02:22:21.404302Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.11728","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":"2026-07-14T02:22:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OzKE68YEazda+g4cIL7tnXzXWHQCgrSJK6MEjuz91svRl3iOqb1TkjpAEBGttud0grSt1oe3WlQioohvn+yHBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T14:15:36.626095Z"},"content_sha256":"35725e8f69d2004d1b3a646274d85bae0dd21d317d9c0c81cf6395b877f76fd1","schema_version":"1.0","event_id":"sha256:35725e8f69d2004d1b3a646274d85bae0dd21d317d9c0c81cf6395b877f76fd1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:ZW4GCAUFA45WRRIOAMKQSU372R","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Modeling the Impact of Starspot Inhomogeneity on Spectroscopic Retrievals of Directly-Imaged Planets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.EP","authors_text":"Alex R. Howe, Avi M. Mandel, Christopher C. Stark, Natasha Latouf, Veselin Kostov","submitted_at":"2026-07-13T15:54:49Z","abstract_excerpt":"Stellar activity is a major complication in the detection and characterization of exoplanets by both radial velocities and transits, and the upcoming Habitable Worlds Observatory (HWO) invites us to also consider its effect on direct imaging. Spectra of directly-imaged planets can vary with the activity of their host stars because the face of the star we see is not the same as the face reflected by the planet. This discrepancy could potentially result in inaccurate measurements of the planet's radius and unexpected, externally-caused variability in its contrast spectrum with the star. To asses"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.11728","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/2607.11728/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":"2026-07-14T02:22:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o23npC/aRr32Wft1rayC7npmQeflnxCtkflWkY/hMdoeoxcj7aO/5mktrp0cdeosvORDiRwdJ56/OnA26s+UBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T14:15:36.627174Z"},"content_sha256":"6ffbc29db1e23005c6bffc62518695f1ae55a1453831271d201e4a30cb646ad3","schema_version":"1.0","event_id":"sha256:6ffbc29db1e23005c6bffc62518695f1ae55a1453831271d201e4a30cb646ad3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZW4GCAUFA45WRRIOAMKQSU372R/bundle.json","state_url":"https://pith.science/pith/ZW4GCAUFA45WRRIOAMKQSU372R/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZW4GCAUFA45WRRIOAMKQSU372R/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":"2026-08-09T14:15:36Z","links":{"resolver":"https://pith.science/pith/ZW4GCAUFA45WRRIOAMKQSU372R","bundle":"https://pith.science/pith/ZW4GCAUFA45WRRIOAMKQSU372R/bundle.json","state":"https://pith.science/pith/ZW4GCAUFA45WRRIOAMKQSU372R/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZW4GCAUFA45WRRIOAMKQSU372R/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:ZW4GCAUFA45WRRIOAMKQSU372R","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":"8541fe523b2a8c8a6f43a30d204615e68ba463d409e77575c15313cafd4af8f9","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-07-13T15:54:49Z","title_canon_sha256":"bf71ab32f8bab3827dfd8007cfcfdcc473f96837f80b80978559105d7d197ab3"},"schema_version":"1.0","source":{"id":"2607.11728","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.11728","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"arxiv_version","alias_value":"2607.11728v1","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.11728","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"pith_short_12","alias_value":"ZW4GCAUFA45W","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"pith_short_16","alias_value":"ZW4GCAUFA45WRRIO","created_at":"2026-07-14T02:22:21Z"},{"alias_kind":"pith_short_8","alias_value":"ZW4GCAUF","created_at":"2026-07-14T02:22:21Z"}],"graph_snapshots":[{"event_id":"sha256:6ffbc29db1e23005c6bffc62518695f1ae55a1453831271d201e4a30cb646ad3","target":"graph","created_at":"2026-07-14T02:22:21Z","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/2607.11728/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Stellar activity is a major complication in the detection and characterization of exoplanets by both radial velocities and transits, and the upcoming Habitable Worlds Observatory (HWO) invites us to also consider its effect on direct imaging. Spectra of directly-imaged planets can vary with the activity of their host stars because the face of the star we see is not the same as the face reflected by the planet. This discrepancy could potentially result in inaccurate measurements of the planet's radius and unexpected, externally-caused variability in its contrast spectrum with the star. To asses","authors_text":"Alex R. Howe, Avi M. Mandel, Christopher C. Stark, Natasha Latouf, Veselin Kostov","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-07-13T15:54:49Z","title":"Modeling the Impact of Starspot Inhomogeneity on Spectroscopic Retrievals of Directly-Imaged Planets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.11728","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":"sha256:35725e8f69d2004d1b3a646274d85bae0dd21d317d9c0c81cf6395b877f76fd1","target":"record","created_at":"2026-07-14T02:22:21Z","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":"8541fe523b2a8c8a6f43a30d204615e68ba463d409e77575c15313cafd4af8f9","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2026-07-13T15:54:49Z","title_canon_sha256":"bf71ab32f8bab3827dfd8007cfcfdcc473f96837f80b80978559105d7d197ab3"},"schema_version":"1.0","source":{"id":"2607.11728","kind":"arxiv","version":1}},"canonical_sha256":"cdb8610285073b68c50e031509537fd4585315430a7a9643eabcb32bec56ee0b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cdb8610285073b68c50e031509537fd4585315430a7a9643eabcb32bec56ee0b","first_computed_at":"2026-07-14T02:22:21.404302Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-14T02:22:21.404302Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DlAMCxRRW/ldEF7i/1evMi3FFuR0WxzTousYr6zWeyXRvKfIAGDgSNmXE6Rm+RkWEfY1eJV5sgDIfUAPAyb9DQ==","signature_status":"signed_v1","signed_at":"2026-07-14T02:22:21.406873Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.11728","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:35725e8f69d2004d1b3a646274d85bae0dd21d317d9c0c81cf6395b877f76fd1","sha256:6ffbc29db1e23005c6bffc62518695f1ae55a1453831271d201e4a30cb646ad3"],"state_sha256":"834a473d5643b77c8c0842bb4d5af33d7bfc9eae271cffe3c3b10ebd30ffd129"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IP12lWdFu73kc37teRWSSC2op3zc+cediKLrvpXYyyIPIyZyr6xxxCnODuE5eaatjpKos2S3gLrinOTOrCdJBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T14:15:36.634241Z","bundle_sha256":"13acdc00002ec70b1eb3947916dc55284dc51a22577d9d43e400a52c8b816595"}}