{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:N6PNBRFH3IHBQRK2NAJIFOI4XA","short_pith_number":"pith:N6PNBRFH","canonical_record":{"source":{"id":"astro-ph/0303528","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-03-24T13:30:33Z","cross_cats_sorted":[],"title_canon_sha256":"9551a6005f7cc648420d1735effdc63a96ce52530c66ca3fd45104a2c43c8d08","abstract_canon_sha256":"9793f239e32f37eab57db1b46cd163cc9dd8dd98c6322ba9f8dcb93f62a5da45"},"schema_version":"1.0"},"canonical_sha256":"6f9ed0c4a7da0e18455a681282b91cb804de0d6baad7f4ff4e421ae0cf9f9919","source":{"kind":"arxiv","id":"astro-ph/0303528","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0303528","created_at":"2026-05-18T04:21:41Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0303528v1","created_at":"2026-05-18T04:21:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0303528","created_at":"2026-05-18T04:21:41Z"},{"alias_kind":"pith_short_12","alias_value":"N6PNBRFH3IHB","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"N6PNBRFH3IHBQRK2","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"N6PNBRFH","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:N6PNBRFH3IHBQRK2NAJIFOI4XA","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0303528","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-03-24T13:30:33Z","cross_cats_sorted":[],"title_canon_sha256":"9551a6005f7cc648420d1735effdc63a96ce52530c66ca3fd45104a2c43c8d08","abstract_canon_sha256":"9793f239e32f37eab57db1b46cd163cc9dd8dd98c6322ba9f8dcb93f62a5da45"},"schema_version":"1.0"},"canonical_sha256":"6f9ed0c4a7da0e18455a681282b91cb804de0d6baad7f4ff4e421ae0cf9f9919","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:21:41.574767Z","signature_b64":"DNiA8OdrAcN/u648QoBrFS03BFE6mYncHBN277iw7Z7FPaMsXO3YzppC28iz2k2undQhA399JfDQ/uKiAxcFBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6f9ed0c4a7da0e18455a681282b91cb804de0d6baad7f4ff4e421ae0cf9f9919","last_reissued_at":"2026-05-18T04:21:41.574081Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:21:41.574081Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0303528","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":"2026-05-18T04:21:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7fma3RasQ7wDOM+SeNdnar7aCXSBRNOLxA5vXi443bYyVl8qSs8/KDaj/4yy/48ooKAFpqUsU7WVXAqYcMP6Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T13:04:02.568139Z"},"content_sha256":"0c610eab061d15aea4db3d511773bd6adda5d655cd901500296d6f1646fea1ba","schema_version":"1.0","event_id":"sha256:0c610eab061d15aea4db3d511773bd6adda5d655cd901500296d6f1646fea1ba"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:N6PNBRFH3IHBQRK2NAJIFOI4XA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The low-level radial velocity variability in Barnard's star (=GJ 699). Secular acceleration, indications for convective redshift, and planet mass limits","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) McDonald Observatory, (3) Universite de Paris-Sud. (4) The Isaac Newton Group of Telescopes, (5) European Southern Observatory, (6) Harvard-Smithsonian Center for Astrophysics), A. Kaufer (5), A.P. Hatzes (1), F. Rouesnel (3), M. Endl (2), M. Kuerster (1), S. Brillant (5), S. Els (4), S.H. Saar (6), The University of Texas at Austin, W.D. Cochran (2) ((1) Thueringer Landessternwarte Tautenburg","submitted_at":"2003-03-24T13:30:33Z","abstract_excerpt":"We report results from 2 1/2 yr of high precision radial velocity (RV) monitoring of Barnard's star. The high RV measurement precision of the VLT-UT2+UVES of 2.65 m/s made the following findings possible. (1) The first detection of the change in the RV of a star caused by its space motion (RV secular acceleration). (2) An anti-correlation of the measured RV with the strength of the filling-in of the Halpha line by emission. (3) Very stringent mass upper limits to planetary companions. Using only data from the first 2 years, we obtain a best-fit value for the RV secular acceleration of 5.15+/-0"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0303528","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":""},"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":"2026-05-18T04:21:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CcBpA/8CHzbmPQXWkop7O077OyRa6oq3PEuAi7w0KHphUqxewt1snX1Om+cEV5QBE2Fs/JW6S80fx2XNaq3YAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T13:04:02.568511Z"},"content_sha256":"2284e8ca966581532e5e1cd92f86627c0018139b0c9577ccf5dc8f7ccdabad61","schema_version":"1.0","event_id":"sha256:2284e8ca966581532e5e1cd92f86627c0018139b0c9577ccf5dc8f7ccdabad61"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/N6PNBRFH3IHBQRK2NAJIFOI4XA/bundle.json","state_url":"https://pith.science/pith/N6PNBRFH3IHBQRK2NAJIFOI4XA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/N6PNBRFH3IHBQRK2NAJIFOI4XA/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":"2026-06-08T13:04:02Z","links":{"resolver":"https://pith.science/pith/N6PNBRFH3IHBQRK2NAJIFOI4XA","bundle":"https://pith.science/pith/N6PNBRFH3IHBQRK2NAJIFOI4XA/bundle.json","state":"https://pith.science/pith/N6PNBRFH3IHBQRK2NAJIFOI4XA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/N6PNBRFH3IHBQRK2NAJIFOI4XA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:N6PNBRFH3IHBQRK2NAJIFOI4XA","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":"9793f239e32f37eab57db1b46cd163cc9dd8dd98c6322ba9f8dcb93f62a5da45","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-03-24T13:30:33Z","title_canon_sha256":"9551a6005f7cc648420d1735effdc63a96ce52530c66ca3fd45104a2c43c8d08"},"schema_version":"1.0","source":{"id":"astro-ph/0303528","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0303528","created_at":"2026-05-18T04:21:41Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0303528v1","created_at":"2026-05-18T04:21:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0303528","created_at":"2026-05-18T04:21:41Z"},{"alias_kind":"pith_short_12","alias_value":"N6PNBRFH3IHB","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"N6PNBRFH3IHBQRK2","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"N6PNBRFH","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:2284e8ca966581532e5e1cd92f86627c0018139b0c9577ccf5dc8f7ccdabad61","target":"graph","created_at":"2026-05-18T04:21:41Z","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"},"paper":{"abstract_excerpt":"We report results from 2 1/2 yr of high precision radial velocity (RV) monitoring of Barnard's star. The high RV measurement precision of the VLT-UT2+UVES of 2.65 m/s made the following findings possible. (1) The first detection of the change in the RV of a star caused by its space motion (RV secular acceleration). (2) An anti-correlation of the measured RV with the strength of the filling-in of the Halpha line by emission. (3) Very stringent mass upper limits to planetary companions. Using only data from the first 2 years, we obtain a best-fit value for the RV secular acceleration of 5.15+/-0","authors_text":"(2) McDonald Observatory, (3) Universite de Paris-Sud. (4) The Isaac Newton Group of Telescopes, (5) European Southern Observatory, (6) Harvard-Smithsonian Center for Astrophysics), A. Kaufer (5), A.P. Hatzes (1), F. Rouesnel (3), M. Endl (2), M. Kuerster (1), S. Brillant (5), S. Els (4), S.H. Saar (6), The University of Texas at Austin, W.D. Cochran (2) ((1) Thueringer Landessternwarte Tautenburg","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-03-24T13:30:33Z","title":"The low-level radial velocity variability in Barnard's star (=GJ 699). Secular acceleration, indications for convective redshift, and planet mass limits"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0303528","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":"sha256:0c610eab061d15aea4db3d511773bd6adda5d655cd901500296d6f1646fea1ba","target":"record","created_at":"2026-05-18T04:21:41Z","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":"9793f239e32f37eab57db1b46cd163cc9dd8dd98c6322ba9f8dcb93f62a5da45","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-03-24T13:30:33Z","title_canon_sha256":"9551a6005f7cc648420d1735effdc63a96ce52530c66ca3fd45104a2c43c8d08"},"schema_version":"1.0","source":{"id":"astro-ph/0303528","kind":"arxiv","version":1}},"canonical_sha256":"6f9ed0c4a7da0e18455a681282b91cb804de0d6baad7f4ff4e421ae0cf9f9919","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6f9ed0c4a7da0e18455a681282b91cb804de0d6baad7f4ff4e421ae0cf9f9919","first_computed_at":"2026-05-18T04:21:41.574081Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:21:41.574081Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DNiA8OdrAcN/u648QoBrFS03BFE6mYncHBN277iw7Z7FPaMsXO3YzppC28iz2k2undQhA399JfDQ/uKiAxcFBA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:21:41.574767Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0303528","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0c610eab061d15aea4db3d511773bd6adda5d655cd901500296d6f1646fea1ba","sha256:2284e8ca966581532e5e1cd92f86627c0018139b0c9577ccf5dc8f7ccdabad61"],"state_sha256":"46f6a4cfb900e99a6888293f33f698f4c4f23cbfd2c3d519a59b50a9c98c9e91"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/GsLgeDOxMgMuw3YE4zytjF4bgvVIvkhZRq1VnmKGWdwlfJNGIn2hsdFzLvuGw0dhp9a/GkBV+kajrAfhA8EDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T13:04:02.570409Z","bundle_sha256":"20d0781994f61514fb7328afa6cc585ad0c19e9a797591422004c39a43bf9e03"}}