{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:YYUUHCXCSWV6KCNILZSRHM6QUX","short_pith_number":"pith:YYUUHCXC","canonical_record":{"source":{"id":"2308.10539","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-08-21T07:46:22Z","cross_cats_sorted":[],"title_canon_sha256":"140811a8abfac56e73301137eb07b133e95af48974c5c3675f6915169076106e","abstract_canon_sha256":"4ac8683a90ac143eb134e079c7cc620fbe06cfd95986d42c94219e171047d005"},"schema_version":"1.0"},"canonical_sha256":"c629438ae295abe509a85e6513b3d0a5cbc03da7a42ddab579855951b0d34422","source":{"kind":"arxiv","id":"2308.10539","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.10539","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"arxiv_version","alias_value":"2308.10539v1","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.10539","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"pith_short_12","alias_value":"YYUUHCXCSWV6","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"pith_short_16","alias_value":"YYUUHCXCSWV6KCNI","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"pith_short_8","alias_value":"YYUUHCXC","created_at":"2026-07-05T06:46:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:YYUUHCXCSWV6KCNILZSRHM6QUX","target":"record","payload":{"canonical_record":{"source":{"id":"2308.10539","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-08-21T07:46:22Z","cross_cats_sorted":[],"title_canon_sha256":"140811a8abfac56e73301137eb07b133e95af48974c5c3675f6915169076106e","abstract_canon_sha256":"4ac8683a90ac143eb134e079c7cc620fbe06cfd95986d42c94219e171047d005"},"schema_version":"1.0"},"canonical_sha256":"c629438ae295abe509a85e6513b3d0a5cbc03da7a42ddab579855951b0d34422","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:46:34.186009Z","signature_b64":"cNbaqVAgw3tjRlj74+fH/6xZMBZmsIq5ZZi5G1KCJHydlA/qqTFxruE4ulpPDdBlkZjeFWkTUTBvcAVJVTcABA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c629438ae295abe509a85e6513b3d0a5cbc03da7a42ddab579855951b0d34422","last_reissued_at":"2026-07-05T06:46:34.185284Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:46:34.185284Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2308.10539","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":"2026-07-05T06:46:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aBFseo8oULrXJBgeiJcPxlSw44pKJ9O0MIVSHCCQCmHckrKsOaDu/3jxVxj+0ehFNgR4Lfm9t1HR7tNxaMBfAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T19:12:24.196545Z"},"content_sha256":"059318afc13d287628177e0fd33d644ced1e48389b879d6d667dc810ebae2a6d","schema_version":"1.0","event_id":"sha256:059318afc13d287628177e0fd33d644ced1e48389b879d6d667dc810ebae2a6d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:YYUUHCXCSWV6KCNILZSRHM6QUX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Unravelling the Period Gap using LAMOST Chromospheric Activity Indices","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Deepak Chahal, Devika Kamath, Paolo Ventura, Richard de Grijs, Xiaodian Chen","submitted_at":"2023-08-21T07:46:22Z","abstract_excerpt":"In our recent catalogue of BY Draconis (BY Dra) variables based on Zwicky Transient Facility data, we found traces of a period gap in the period-colour diagram. We combined our BY Dra database with catalogues from the {\\sl Kepler} and K2 surveys, revealing a prominent period gap. Here, we use this combined ZTF-{\\sl Kepler}-K2 data set to investigate the origin of the period gap observed for BY Dra stars using chromospheric activity indices. We use low- and medium-resolution spectra from the LAMOST Data Release 7 to derive magnetic activity indices for the Ca {\\sc ii} H and K and H$\\alpha$ emis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.10539","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/2308.10539/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":"2026-07-05T06:46:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fwnl5btnUDYJKloZFVIH/tZrXVIfX459nflJvoW+j4k6ozBeylSbjHWu2DKVQ4KjxZiAFcKaOFoX4IJASbmeDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T19:12:24.197059Z"},"content_sha256":"489cb47b83acd818aec8a2010ccbf90b7e4ef322c484e0ec8a933098b88ba3ef","schema_version":"1.0","event_id":"sha256:489cb47b83acd818aec8a2010ccbf90b7e4ef322c484e0ec8a933098b88ba3ef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YYUUHCXCSWV6KCNILZSRHM6QUX/bundle.json","state_url":"https://pith.science/pith/YYUUHCXCSWV6KCNILZSRHM6QUX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YYUUHCXCSWV6KCNILZSRHM6QUX/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":"2026-08-03T19:12:24Z","links":{"resolver":"https://pith.science/pith/YYUUHCXCSWV6KCNILZSRHM6QUX","bundle":"https://pith.science/pith/YYUUHCXCSWV6KCNILZSRHM6QUX/bundle.json","state":"https://pith.science/pith/YYUUHCXCSWV6KCNILZSRHM6QUX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YYUUHCXCSWV6KCNILZSRHM6QUX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:YYUUHCXCSWV6KCNILZSRHM6QUX","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":"4ac8683a90ac143eb134e079c7cc620fbe06cfd95986d42c94219e171047d005","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-08-21T07:46:22Z","title_canon_sha256":"140811a8abfac56e73301137eb07b133e95af48974c5c3675f6915169076106e"},"schema_version":"1.0","source":{"id":"2308.10539","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.10539","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"arxiv_version","alias_value":"2308.10539v1","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.10539","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"pith_short_12","alias_value":"YYUUHCXCSWV6","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"pith_short_16","alias_value":"YYUUHCXCSWV6KCNI","created_at":"2026-07-05T06:46:34Z"},{"alias_kind":"pith_short_8","alias_value":"YYUUHCXC","created_at":"2026-07-05T06:46:34Z"}],"graph_snapshots":[{"event_id":"sha256:489cb47b83acd818aec8a2010ccbf90b7e4ef322c484e0ec8a933098b88ba3ef","target":"graph","created_at":"2026-07-05T06:46:34Z","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/2308.10539/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In our recent catalogue of BY Draconis (BY Dra) variables based on Zwicky Transient Facility data, we found traces of a period gap in the period-colour diagram. We combined our BY Dra database with catalogues from the {\\sl Kepler} and K2 surveys, revealing a prominent period gap. Here, we use this combined ZTF-{\\sl Kepler}-K2 data set to investigate the origin of the period gap observed for BY Dra stars using chromospheric activity indices. We use low- and medium-resolution spectra from the LAMOST Data Release 7 to derive magnetic activity indices for the Ca {\\sc ii} H and K and H$\\alpha$ emis","authors_text":"Deepak Chahal, Devika Kamath, Paolo Ventura, Richard de Grijs, Xiaodian Chen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-08-21T07:46:22Z","title":"Unravelling the Period Gap using LAMOST Chromospheric Activity Indices"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.10539","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":"sha256:059318afc13d287628177e0fd33d644ced1e48389b879d6d667dc810ebae2a6d","target":"record","created_at":"2026-07-05T06:46:34Z","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":"4ac8683a90ac143eb134e079c7cc620fbe06cfd95986d42c94219e171047d005","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-08-21T07:46:22Z","title_canon_sha256":"140811a8abfac56e73301137eb07b133e95af48974c5c3675f6915169076106e"},"schema_version":"1.0","source":{"id":"2308.10539","kind":"arxiv","version":1}},"canonical_sha256":"c629438ae295abe509a85e6513b3d0a5cbc03da7a42ddab579855951b0d34422","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c629438ae295abe509a85e6513b3d0a5cbc03da7a42ddab579855951b0d34422","first_computed_at":"2026-07-05T06:46:34.185284Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:46:34.185284Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cNbaqVAgw3tjRlj74+fH/6xZMBZmsIq5ZZi5G1KCJHydlA/qqTFxruE4ulpPDdBlkZjeFWkTUTBvcAVJVTcABA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:46:34.186009Z","signed_message":"canonical_sha256_bytes"},"source_id":"2308.10539","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:059318afc13d287628177e0fd33d644ced1e48389b879d6d667dc810ebae2a6d","sha256:489cb47b83acd818aec8a2010ccbf90b7e4ef322c484e0ec8a933098b88ba3ef"],"state_sha256":"48416750d7e0ac0d3d3085e8faad281170e72a0a07258e7e9d118ddad2c247a4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qeaDgv1wr8thN3158a66GAYDKaLGSe2EV2yd+kCKoTXUpUOocizk+42JbvdilwkYyeBLpXnTOfYQw9k3wUUDCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T19:12:24.202360Z","bundle_sha256":"8ecc774b3eac064d9e347053efd1c051b8343e6f4ddf7e2e778fcd0d85199825"}}