{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:GS6M2O2PWQ6SP2ELBPMAZDXSLF","short_pith_number":"pith:GS6M2O2P","canonical_record":{"source":{"id":"1303.0311","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-03-01T21:53:39Z","cross_cats_sorted":[],"title_canon_sha256":"f07add7f868671fc5829fa2663684900f906911533dadfbe4fa8c4341e6b427a","abstract_canon_sha256":"de3ef1de7e04996b3408889c6ff2115c43ea84847d115ce6357ab53f17281987"},"schema_version":"1.0"},"canonical_sha256":"34bccd3b4fb43d27e88b0bd80c8ef2596ba07d28dc66dbeb7683ba38df553a1a","source":{"kind":"arxiv","id":"1303.0311","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.0311","created_at":"2026-05-18T03:31:56Z"},{"alias_kind":"arxiv_version","alias_value":"1303.0311v1","created_at":"2026-05-18T03:31:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.0311","created_at":"2026-05-18T03:31:56Z"},{"alias_kind":"pith_short_12","alias_value":"GS6M2O2PWQ6S","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GS6M2O2PWQ6SP2EL","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GS6M2O2P","created_at":"2026-05-18T12:27:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:GS6M2O2PWQ6SP2ELBPMAZDXSLF","target":"record","payload":{"canonical_record":{"source":{"id":"1303.0311","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-03-01T21:53:39Z","cross_cats_sorted":[],"title_canon_sha256":"f07add7f868671fc5829fa2663684900f906911533dadfbe4fa8c4341e6b427a","abstract_canon_sha256":"de3ef1de7e04996b3408889c6ff2115c43ea84847d115ce6357ab53f17281987"},"schema_version":"1.0"},"canonical_sha256":"34bccd3b4fb43d27e88b0bd80c8ef2596ba07d28dc66dbeb7683ba38df553a1a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:31:56.501950Z","signature_b64":"PYyBwq0HMz+tZ6Hme3PAyiFCmcQPgYfrwbyuOHaN2e2WDhmNUO5pniy6IMdzSZsQwmwBCrIOPf0cuh1fB2tJBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"34bccd3b4fb43d27e88b0bd80c8ef2596ba07d28dc66dbeb7683ba38df553a1a","last_reissued_at":"2026-05-18T03:31:56.501326Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:31:56.501326Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1303.0311","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":"2026-05-18T03:31:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7JmTFrnTr94cblkMT5ku9gehs0Msn4LYuGhRf4Jece9bX7mBIMgnBmeRsQOX3bif34A5ntqRf4MfhmL1A+VFCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T04:33:32.499077Z"},"content_sha256":"3fc4d0180f010cba3c77991367a384b665f91d37086dd9f5403626a32c779de8","schema_version":"1.0","event_id":"sha256:3fc4d0180f010cba3c77991367a384b665f91d37086dd9f5403626a32c779de8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:GS6M2O2PWQ6SP2ELBPMAZDXSLF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A magnetic cycle of tau Bootis? The coronal and chromospheric view","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"H.M. Guenther, J.H.M.M. Schmitt, K. Poppenhaeger","submitted_at":"2013-03-01T21:53:39Z","abstract_excerpt":"Tau Bootis is a late F-type main sequence star orbited by a Hot Jupiter. During the last years spectropolarimetric observations led to the hypothesis that this star may host a global magnetic field that switches its polarity once per year, indicating a very short activity cycle of only one year duration. In our ongoing observational campaign, we have collected several X-ray observations with XMM-Newton and optical spectra with TRES/FLWO in Arizona to characterize tau Boo's corona and chromosphere over the course of the supposed one-year cycle. Contrary to the spectropolarimetric reconstruction"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.0311","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":"2026-05-18T03:31:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o6kJUnsGnayh1sv9Ivjw/x5/tm00NuhOAPoTmmsWJlRWOvwDU9+I4j2tupixYYuauG9Y2E1Eoo7d7+aoB4oXDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T04:33:32.499442Z"},"content_sha256":"472631b2d0c99693b908649812ca2b6664ed40afc29af9d3f3a2ac5f485a64a8","schema_version":"1.0","event_id":"sha256:472631b2d0c99693b908649812ca2b6664ed40afc29af9d3f3a2ac5f485a64a8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GS6M2O2PWQ6SP2ELBPMAZDXSLF/bundle.json","state_url":"https://pith.science/pith/GS6M2O2PWQ6SP2ELBPMAZDXSLF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GS6M2O2PWQ6SP2ELBPMAZDXSLF/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":"2026-05-30T04:33:32Z","links":{"resolver":"https://pith.science/pith/GS6M2O2PWQ6SP2ELBPMAZDXSLF","bundle":"https://pith.science/pith/GS6M2O2PWQ6SP2ELBPMAZDXSLF/bundle.json","state":"https://pith.science/pith/GS6M2O2PWQ6SP2ELBPMAZDXSLF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GS6M2O2PWQ6SP2ELBPMAZDXSLF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:GS6M2O2PWQ6SP2ELBPMAZDXSLF","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":"de3ef1de7e04996b3408889c6ff2115c43ea84847d115ce6357ab53f17281987","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-03-01T21:53:39Z","title_canon_sha256":"f07add7f868671fc5829fa2663684900f906911533dadfbe4fa8c4341e6b427a"},"schema_version":"1.0","source":{"id":"1303.0311","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.0311","created_at":"2026-05-18T03:31:56Z"},{"alias_kind":"arxiv_version","alias_value":"1303.0311v1","created_at":"2026-05-18T03:31:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.0311","created_at":"2026-05-18T03:31:56Z"},{"alias_kind":"pith_short_12","alias_value":"GS6M2O2PWQ6S","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GS6M2O2PWQ6SP2EL","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GS6M2O2P","created_at":"2026-05-18T12:27:45Z"}],"graph_snapshots":[{"event_id":"sha256:472631b2d0c99693b908649812ca2b6664ed40afc29af9d3f3a2ac5f485a64a8","target":"graph","created_at":"2026-05-18T03:31:56Z","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":"Tau Bootis is a late F-type main sequence star orbited by a Hot Jupiter. During the last years spectropolarimetric observations led to the hypothesis that this star may host a global magnetic field that switches its polarity once per year, indicating a very short activity cycle of only one year duration. In our ongoing observational campaign, we have collected several X-ray observations with XMM-Newton and optical spectra with TRES/FLWO in Arizona to characterize tau Boo's corona and chromosphere over the course of the supposed one-year cycle. Contrary to the spectropolarimetric reconstruction","authors_text":"H.M. Guenther, J.H.M.M. Schmitt, K. Poppenhaeger","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-03-01T21:53:39Z","title":"A magnetic cycle of tau Bootis? The coronal and chromospheric view"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.0311","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":"sha256:3fc4d0180f010cba3c77991367a384b665f91d37086dd9f5403626a32c779de8","target":"record","created_at":"2026-05-18T03:31:56Z","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":"de3ef1de7e04996b3408889c6ff2115c43ea84847d115ce6357ab53f17281987","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-03-01T21:53:39Z","title_canon_sha256":"f07add7f868671fc5829fa2663684900f906911533dadfbe4fa8c4341e6b427a"},"schema_version":"1.0","source":{"id":"1303.0311","kind":"arxiv","version":1}},"canonical_sha256":"34bccd3b4fb43d27e88b0bd80c8ef2596ba07d28dc66dbeb7683ba38df553a1a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"34bccd3b4fb43d27e88b0bd80c8ef2596ba07d28dc66dbeb7683ba38df553a1a","first_computed_at":"2026-05-18T03:31:56.501326Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:31:56.501326Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PYyBwq0HMz+tZ6Hme3PAyiFCmcQPgYfrwbyuOHaN2e2WDhmNUO5pniy6IMdzSZsQwmwBCrIOPf0cuh1fB2tJBA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:31:56.501950Z","signed_message":"canonical_sha256_bytes"},"source_id":"1303.0311","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3fc4d0180f010cba3c77991367a384b665f91d37086dd9f5403626a32c779de8","sha256:472631b2d0c99693b908649812ca2b6664ed40afc29af9d3f3a2ac5f485a64a8"],"state_sha256":"c59c2e7adfcce59e0eed95acfcd0a80cdeeb922ec22f2ee1ef81543014dc8706"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X1x+bbuTsgha7mn8gE/izvg+G5/sKOss0A8hCsL51N9Q3CiAoGNIwwwyNaIOAGVCFiIh20ham2WtVxORlutUDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T04:33:32.501670Z","bundle_sha256":"9a69818417052c2b9d210fefcff41a779a6cb152e8e9eb9d13dc6ccae84c3fe7"}}