{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:5MGXC7JFFNAIU4NYCT4MUAU7NL","short_pith_number":"pith:5MGXC7JF","canonical_record":{"source":{"id":"2101.08801","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-01-21T19:00:10Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"92649f69fc34bd673834025b933d5310155bcc63093f93c02686fb5c86e8736d","abstract_canon_sha256":"80ba9d5a5952f46365d51b26ff5c4f58aa80cf0d28a498e143ae98b95fdccb17"},"schema_version":"1.0"},"canonical_sha256":"eb0d717d252b408a71b814f8ca029f6adef12b17f0a5cb2d20f348370ab80e99","source":{"kind":"arxiv","id":"2101.08801","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.08801","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"arxiv_version","alias_value":"2101.08801v1","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.08801","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"pith_short_12","alias_value":"5MGXC7JFFNAI","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"pith_short_16","alias_value":"5MGXC7JFFNAIU4NY","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"pith_short_8","alias_value":"5MGXC7JF","created_at":"2026-07-05T02:21:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:5MGXC7JFFNAIU4NYCT4MUAU7NL","target":"record","payload":{"canonical_record":{"source":{"id":"2101.08801","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-01-21T19:00:10Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"92649f69fc34bd673834025b933d5310155bcc63093f93c02686fb5c86e8736d","abstract_canon_sha256":"80ba9d5a5952f46365d51b26ff5c4f58aa80cf0d28a498e143ae98b95fdccb17"},"schema_version":"1.0"},"canonical_sha256":"eb0d717d252b408a71b814f8ca029f6adef12b17f0a5cb2d20f348370ab80e99","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:21:44.423686Z","signature_b64":"snVWab7DAX+mY0RQ4dXDPEPey5NsnlFHR1VdD8U9xFDVCRWBbSBMlnpDa0ovEUPkeMGEhtEAYlEgu62iU86RAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb0d717d252b408a71b814f8ca029f6adef12b17f0a5cb2d20f348370ab80e99","last_reissued_at":"2026-07-05T02:21:44.423265Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:21:44.423265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2101.08801","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":"2026-07-05T02:21:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eBXJsh84kCTi4Rx0JXxC9sNdEIOYYnaGh5NM6zJDQVn1hCo8HLGJVKqoaKDuTEhkVvyQWIiqGTDJXA9DlqoiDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T05:44:08.794833Z"},"content_sha256":"4fdb057f2f5eab2bcaedd2519770a1cb95cbbe0a5454c3aa9f68159e771cd984","schema_version":"1.0","event_id":"sha256:4fdb057f2f5eab2bcaedd2519770a1cb95cbbe0a5454c3aa9f68159e771cd984"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:5MGXC7JFFNAIU4NYCT4MUAU7NL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A decade of radial-velocity monitoring of Vega and new limits on the presence of planets","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Andrew Vanderburg, Christian A. Latham, David W. Latham, George Zhou, Gilbert A. Esquerdo, Michael L. Calkins, Perry Berlind, Ruth Angus, Samuel N. Quinn, Spencer A. Hurt","submitted_at":"2021-01-21T19:00:10Z","abstract_excerpt":"We present an analysis of 1524 spectra of Vega spanning 10 years, in which we search for periodic radial velocity variations. A signal with a periodicity of 0.676 days and a semi-amplitude of ~10 m/s is consistent with the rotation period measured over much shorter time spans by previous spectroscopic and spectropolarimetric studies, confirming the presence of surface features on this A0 star. The timescale of evolution of these features can provide insight into the mechanism that sustains the weak magnetic fields in normal A type stars. Modeling the radial velocities with a Gaussian process u"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.08801","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/2101.08801/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":"2026-07-05T02:21:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M4JJZwdJXVj707zs5x5hcod5csqn0F/Bvh/Mu2ybpFZScx3ngsrCPJ0kwri8JEiFnJ54DqpjEUW2KkSgtau+AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T05:44:08.795383Z"},"content_sha256":"0dcbc8444848902872cd2a95e6e527d31c5f5d2f523064af80f648402e6f7151","schema_version":"1.0","event_id":"sha256:0dcbc8444848902872cd2a95e6e527d31c5f5d2f523064af80f648402e6f7151"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5MGXC7JFFNAIU4NYCT4MUAU7NL/bundle.json","state_url":"https://pith.science/pith/5MGXC7JFFNAIU4NYCT4MUAU7NL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5MGXC7JFFNAIU4NYCT4MUAU7NL/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":"2026-08-19T05:44:08Z","links":{"resolver":"https://pith.science/pith/5MGXC7JFFNAIU4NYCT4MUAU7NL","bundle":"https://pith.science/pith/5MGXC7JFFNAIU4NYCT4MUAU7NL/bundle.json","state":"https://pith.science/pith/5MGXC7JFFNAIU4NYCT4MUAU7NL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5MGXC7JFFNAIU4NYCT4MUAU7NL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:5MGXC7JFFNAIU4NYCT4MUAU7NL","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":"80ba9d5a5952f46365d51b26ff5c4f58aa80cf0d28a498e143ae98b95fdccb17","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-01-21T19:00:10Z","title_canon_sha256":"92649f69fc34bd673834025b933d5310155bcc63093f93c02686fb5c86e8736d"},"schema_version":"1.0","source":{"id":"2101.08801","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.08801","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"arxiv_version","alias_value":"2101.08801v1","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.08801","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"pith_short_12","alias_value":"5MGXC7JFFNAI","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"pith_short_16","alias_value":"5MGXC7JFFNAIU4NY","created_at":"2026-07-05T02:21:44Z"},{"alias_kind":"pith_short_8","alias_value":"5MGXC7JF","created_at":"2026-07-05T02:21:44Z"}],"graph_snapshots":[{"event_id":"sha256:0dcbc8444848902872cd2a95e6e527d31c5f5d2f523064af80f648402e6f7151","target":"graph","created_at":"2026-07-05T02:21:44Z","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/2101.08801/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present an analysis of 1524 spectra of Vega spanning 10 years, in which we search for periodic radial velocity variations. A signal with a periodicity of 0.676 days and a semi-amplitude of ~10 m/s is consistent with the rotation period measured over much shorter time spans by previous spectroscopic and spectropolarimetric studies, confirming the presence of surface features on this A0 star. The timescale of evolution of these features can provide insight into the mechanism that sustains the weak magnetic fields in normal A type stars. Modeling the radial velocities with a Gaussian process u","authors_text":"Andrew Vanderburg, Christian A. Latham, David W. Latham, George Zhou, Gilbert A. Esquerdo, Michael L. Calkins, Perry Berlind, Ruth Angus, Samuel N. Quinn, Spencer A. Hurt","cross_cats":["astro-ph.SR"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-01-21T19:00:10Z","title":"A decade of radial-velocity monitoring of Vega and new limits on the presence of planets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.08801","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":"sha256:4fdb057f2f5eab2bcaedd2519770a1cb95cbbe0a5454c3aa9f68159e771cd984","target":"record","created_at":"2026-07-05T02:21:44Z","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":"80ba9d5a5952f46365d51b26ff5c4f58aa80cf0d28a498e143ae98b95fdccb17","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-01-21T19:00:10Z","title_canon_sha256":"92649f69fc34bd673834025b933d5310155bcc63093f93c02686fb5c86e8736d"},"schema_version":"1.0","source":{"id":"2101.08801","kind":"arxiv","version":1}},"canonical_sha256":"eb0d717d252b408a71b814f8ca029f6adef12b17f0a5cb2d20f348370ab80e99","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eb0d717d252b408a71b814f8ca029f6adef12b17f0a5cb2d20f348370ab80e99","first_computed_at":"2026-07-05T02:21:44.423265Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:21:44.423265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"snVWab7DAX+mY0RQ4dXDPEPey5NsnlFHR1VdD8U9xFDVCRWBbSBMlnpDa0ovEUPkeMGEhtEAYlEgu62iU86RAw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:21:44.423686Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.08801","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4fdb057f2f5eab2bcaedd2519770a1cb95cbbe0a5454c3aa9f68159e771cd984","sha256:0dcbc8444848902872cd2a95e6e527d31c5f5d2f523064af80f648402e6f7151"],"state_sha256":"a31e4401d2ceb07a1839ad1f99833047d71b8fcf1a2ebb42550e8cfcb99ff627"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2D5zl0qb5BvfbbFsn/fypSpDlMoo5xKKS8T4p22hpK0kB+UaJbD+43Ef+lCo6wYKbRMeTtOteAnzy1scBIOvCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T05:44:08.801757Z","bundle_sha256":"2da45db9617e506af6f945e6c3f9cd274e418e4ee7022f063c9edd3a19c7f6d0"}}