{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:4SGKBVTAZ6FAAEYN75PRVWNUCE","short_pith_number":"pith:4SGKBVTA","canonical_record":{"source":{"id":"2105.12231","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-05-25T21:42:38Z","cross_cats_sorted":[],"title_canon_sha256":"5f2fcaee7a714fafec630613a9083526296fe930036109c9f4457f83f83c47c2","abstract_canon_sha256":"e1682a904a12af7aa50af716d65c55fc821946d6cdcd9fb5f9537e4b170145a3"},"schema_version":"1.0"},"canonical_sha256":"e48ca0d660cf8a00130dff5f1ad9b4112a8ac7d4a3eb4e60da761b9550cfdfb1","source":{"kind":"arxiv","id":"2105.12231","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.12231","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"arxiv_version","alias_value":"2105.12231v1","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.12231","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"pith_short_12","alias_value":"4SGKBVTAZ6FA","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"pith_short_16","alias_value":"4SGKBVTAZ6FAAEYN","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"pith_short_8","alias_value":"4SGKBVTA","created_at":"2026-07-05T03:03:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:4SGKBVTAZ6FAAEYN75PRVWNUCE","target":"record","payload":{"canonical_record":{"source":{"id":"2105.12231","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-05-25T21:42:38Z","cross_cats_sorted":[],"title_canon_sha256":"5f2fcaee7a714fafec630613a9083526296fe930036109c9f4457f83f83c47c2","abstract_canon_sha256":"e1682a904a12af7aa50af716d65c55fc821946d6cdcd9fb5f9537e4b170145a3"},"schema_version":"1.0"},"canonical_sha256":"e48ca0d660cf8a00130dff5f1ad9b4112a8ac7d4a3eb4e60da761b9550cfdfb1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:03:28.650366Z","signature_b64":"X4xskBK+0KEw2G5Yqb3ynJkco9jyNIO6OyD1QlFqGboozWNq+xRt8uquUkWFg38ktq6+I9xaYz8RgcErGAajAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e48ca0d660cf8a00130dff5f1ad9b4112a8ac7d4a3eb4e60da761b9550cfdfb1","last_reissued_at":"2026-07-05T03:03:28.649880Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:03:28.649880Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.12231","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":"2026-07-05T03:03:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cKs5DsawwuQ+P6+JMi+zSPdi6rQRrgsvjE2FdUlBBoe0ZddQUy6KA/MfbSL1cHEKLwLF8oZ9bTbxXxsM18BWAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T20:34:12.460437Z"},"content_sha256":"8597ffaec499af4d12e14a586f5c4ee33a214baf6832896a79efec0f28910cae","schema_version":"1.0","event_id":"sha256:8597ffaec499af4d12e14a586f5c4ee33a214baf6832896a79efec0f28910cae"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:4SGKBVTAZ6FAAEYN75PRVWNUCE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Brightness Fluctuation Spectra of Sun-Like Stars. I. The Mid-Frequency Continuum","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Angela R. G. Santos, Rafael A. Garcia, Savita Mathur, Timothy M. Brown, Travis S. Metcalfe","submitted_at":"2021-05-25T21:42:38Z","abstract_excerpt":"We analyze space-based time series photometry of Sun-like stars, mostly in the Pleiades, but also field stars and the Sun itself. We focus on timescales between roughly 1 hour and 1 day. In the corresponding frequency band these stars display brightness fluctuations with a decreasing power-law continuous spectrum. K2 and Kepler observations show that the RMS flicker due to this Mid-Frequency Continuum (MFC) can reach almost 1%, approaching the modulation amplitude from active regions. The MFC amplitude varies by a factor up to 40 among Pleiades members with similar Teff, depending mainly on th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.12231","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/2105.12231/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":"2026-07-05T03:03:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jah698cJrTY0tQ/JeColwS2pPKbFrokWeBPt7CGbp3ZPc1zZ0Wfls+ejwRQvdjCH9P5JWt4ATvhs8bM7+QcPAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T20:34:12.460778Z"},"content_sha256":"5bab9d837dc5ee9e67c3ca667d6d8208a725dbc023fe06e2910eb485bd52c174","schema_version":"1.0","event_id":"sha256:5bab9d837dc5ee9e67c3ca667d6d8208a725dbc023fe06e2910eb485bd52c174"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4SGKBVTAZ6FAAEYN75PRVWNUCE/bundle.json","state_url":"https://pith.science/pith/4SGKBVTAZ6FAAEYN75PRVWNUCE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4SGKBVTAZ6FAAEYN75PRVWNUCE/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":"2026-08-14T20:34:12Z","links":{"resolver":"https://pith.science/pith/4SGKBVTAZ6FAAEYN75PRVWNUCE","bundle":"https://pith.science/pith/4SGKBVTAZ6FAAEYN75PRVWNUCE/bundle.json","state":"https://pith.science/pith/4SGKBVTAZ6FAAEYN75PRVWNUCE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4SGKBVTAZ6FAAEYN75PRVWNUCE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:4SGKBVTAZ6FAAEYN75PRVWNUCE","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":"e1682a904a12af7aa50af716d65c55fc821946d6cdcd9fb5f9537e4b170145a3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-05-25T21:42:38Z","title_canon_sha256":"5f2fcaee7a714fafec630613a9083526296fe930036109c9f4457f83f83c47c2"},"schema_version":"1.0","source":{"id":"2105.12231","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.12231","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"arxiv_version","alias_value":"2105.12231v1","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.12231","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"pith_short_12","alias_value":"4SGKBVTAZ6FA","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"pith_short_16","alias_value":"4SGKBVTAZ6FAAEYN","created_at":"2026-07-05T03:03:28Z"},{"alias_kind":"pith_short_8","alias_value":"4SGKBVTA","created_at":"2026-07-05T03:03:28Z"}],"graph_snapshots":[{"event_id":"sha256:5bab9d837dc5ee9e67c3ca667d6d8208a725dbc023fe06e2910eb485bd52c174","target":"graph","created_at":"2026-07-05T03:03:28Z","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/2105.12231/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We analyze space-based time series photometry of Sun-like stars, mostly in the Pleiades, but also field stars and the Sun itself. We focus on timescales between roughly 1 hour and 1 day. In the corresponding frequency band these stars display brightness fluctuations with a decreasing power-law continuous spectrum. K2 and Kepler observations show that the RMS flicker due to this Mid-Frequency Continuum (MFC) can reach almost 1%, approaching the modulation amplitude from active regions. The MFC amplitude varies by a factor up to 40 among Pleiades members with similar Teff, depending mainly on th","authors_text":"Angela R. G. Santos, Rafael A. Garcia, Savita Mathur, Timothy M. Brown, Travis S. Metcalfe","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-05-25T21:42:38Z","title":"Brightness Fluctuation Spectra of Sun-Like Stars. I. The Mid-Frequency Continuum"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.12231","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":"sha256:8597ffaec499af4d12e14a586f5c4ee33a214baf6832896a79efec0f28910cae","target":"record","created_at":"2026-07-05T03:03:28Z","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":"e1682a904a12af7aa50af716d65c55fc821946d6cdcd9fb5f9537e4b170145a3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-05-25T21:42:38Z","title_canon_sha256":"5f2fcaee7a714fafec630613a9083526296fe930036109c9f4457f83f83c47c2"},"schema_version":"1.0","source":{"id":"2105.12231","kind":"arxiv","version":1}},"canonical_sha256":"e48ca0d660cf8a00130dff5f1ad9b4112a8ac7d4a3eb4e60da761b9550cfdfb1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e48ca0d660cf8a00130dff5f1ad9b4112a8ac7d4a3eb4e60da761b9550cfdfb1","first_computed_at":"2026-07-05T03:03:28.649880Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:03:28.649880Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"X4xskBK+0KEw2G5Yqb3ynJkco9jyNIO6OyD1QlFqGboozWNq+xRt8uquUkWFg38ktq6+I9xaYz8RgcErGAajAw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:03:28.650366Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.12231","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8597ffaec499af4d12e14a586f5c4ee33a214baf6832896a79efec0f28910cae","sha256:5bab9d837dc5ee9e67c3ca667d6d8208a725dbc023fe06e2910eb485bd52c174"],"state_sha256":"7b1ffc5d930df9688677c0436a838715a9aa47b90ed9168bd984b25d49740924"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hjn7o10F+6qU1qKsFYg6A30Vttbr4JttbVnHHi11mQeaw5sUgcKvAuhij6309eOHZjdmtSS2gpx2qV3UO4GQAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T20:34:12.464197Z","bundle_sha256":"628c286f5158c4f124d80ce8958b704a777755076c3266e0c04c7386f16839a9"}}