{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:O26YFCXSCPKSCBMQX2IRV2CAXZ","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":"7a43e494fb4fa0dd5f3204f98770c4ab353bb6bff24af0f4add15cb2e878b8c4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-07-20T10:16:38Z","title_canon_sha256":"249486a0607f19f8c54b07dce0ce15bdaacc0dbddc623fc195fa9d715d6cf187"},"schema_version":"1.0","source":{"id":"1707.06437","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.06437","created_at":"2026-05-18T00:35:58Z"},{"alias_kind":"arxiv_version","alias_value":"1707.06437v1","created_at":"2026-05-18T00:35:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.06437","created_at":"2026-05-18T00:35:58Z"},{"alias_kind":"pith_short_12","alias_value":"O26YFCXSCPKS","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"O26YFCXSCPKSCBMQ","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"O26YFCXS","created_at":"2026-05-18T12:31:34Z"}],"graph_snapshots":[{"event_id":"sha256:81d55923bc47082d9177f039bece75617215f817602b5fb1714e78f70cdca772","target":"graph","created_at":"2026-05-18T00:35:58Z","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":"Aims. The data set of the long-term XMM-Newton monitoring program of HD 81809 is analyzed to study its X-ray cycle, to investigate if the latter is related to the chromospheric one, to infer the structure of the corona of HD 81809, and to explore if the coronal activity of HD 81809 can be ascribed to phenomena similar to the solar ones and, therefore, considered an extension of the solar case. Methods. We analyze the observations of HD 81809 performed with XMM-Newton with a regular cadence of 6 months from 2001 to 2016 and representing one of the longest available observational baseline ($\\sim","authors_text":"A. Maggio, F. Favata, G. Micela, J.H.M.M. Schmitt, J. Robrade, M. Mittag, S. Orlando, S. Sciortino","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-07-20T10:16:38Z","title":"Fifteen years in the high-energy life of the solar-type star HD 81809. XMM-Newton observations of a stellar activity cycle"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.06437","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:a055b1b0be7b984e488d5eb20b309bf478be49ac498d262d67a88f8d88badd5e","target":"record","created_at":"2026-05-18T00:35:58Z","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":"7a43e494fb4fa0dd5f3204f98770c4ab353bb6bff24af0f4add15cb2e878b8c4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-07-20T10:16:38Z","title_canon_sha256":"249486a0607f19f8c54b07dce0ce15bdaacc0dbddc623fc195fa9d715d6cf187"},"schema_version":"1.0","source":{"id":"1707.06437","kind":"arxiv","version":1}},"canonical_sha256":"76bd828af213d5210590be911ae840be5bfb22d0b0177a66f7765f4a2ce6150b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"76bd828af213d5210590be911ae840be5bfb22d0b0177a66f7765f4a2ce6150b","first_computed_at":"2026-05-18T00:35:58.278576Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:35:58.278576Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7kOU51ziuMDOxL2f2JH9gEh6SQjpwtH4hhEi+RalOjJO+P7JOuoPR30bSBv00kE4658SySvaUyWDP4MfWGkbAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:35:58.279334Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.06437","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a055b1b0be7b984e488d5eb20b309bf478be49ac498d262d67a88f8d88badd5e","sha256:81d55923bc47082d9177f039bece75617215f817602b5fb1714e78f70cdca772"],"state_sha256":"84979e24d51644b1265f12129defe28af8b5039fc388b1898c869a0402de1f25"}