{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:Y76BYCKDOAW5DJADVUYDKZZNZM","short_pith_number":"pith:Y76BYCKD","canonical_record":{"source":{"id":"1404.4390","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-16T21:31:45Z","cross_cats_sorted":[],"title_canon_sha256":"909bcc6f876fec497209f4616f9fb3f061ea15a39e1d37e6b786067693c237a0","abstract_canon_sha256":"24dcfc9a6b69ab19c543811a9603481f752ade2fe67b644226f3fd923371b48e"},"schema_version":"1.0"},"canonical_sha256":"c7fc1c0943702dd1a403ad3035672dcb0ee3db7ed95ef4e45289a69d8b06f4ec","source":{"kind":"arxiv","id":"1404.4390","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1404.4390","created_at":"2026-05-18T01:43:29Z"},{"alias_kind":"arxiv_version","alias_value":"1404.4390v1","created_at":"2026-05-18T01:43:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1404.4390","created_at":"2026-05-18T01:43:29Z"},{"alias_kind":"pith_short_12","alias_value":"Y76BYCKDOAW5","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"Y76BYCKDOAW5DJAD","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"Y76BYCKD","created_at":"2026-05-18T12:28:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:Y76BYCKDOAW5DJADVUYDKZZNZM","target":"record","payload":{"canonical_record":{"source":{"id":"1404.4390","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-16T21:31:45Z","cross_cats_sorted":[],"title_canon_sha256":"909bcc6f876fec497209f4616f9fb3f061ea15a39e1d37e6b786067693c237a0","abstract_canon_sha256":"24dcfc9a6b69ab19c543811a9603481f752ade2fe67b644226f3fd923371b48e"},"schema_version":"1.0"},"canonical_sha256":"c7fc1c0943702dd1a403ad3035672dcb0ee3db7ed95ef4e45289a69d8b06f4ec","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:43:29.201669Z","signature_b64":"x4RuWrmGhi+ptGsI+uk1F5ugvBw3GSx/Y1T3jp9LQ83kcA8An6UnF7h4wO3fOTyqk36IItaTh/jQbpcqgccZDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c7fc1c0943702dd1a403ad3035672dcb0ee3db7ed95ef4e45289a69d8b06f4ec","last_reissued_at":"2026-05-18T01:43:29.201055Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:43:29.201055Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1404.4390","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":"2026-05-18T01:43:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ep4ytrBjq9n9tGs10o2rPYCxfa78iklaGgxiXD2F2xd57mIBhcLZJ2d2YtCZKvMbNgdgFtyLiLhS5BuTHpacAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T18:26:54.792436Z"},"content_sha256":"89f88a0f1787505f80514f1ce98928a8433463cafe0b633c657b76328553fab3","schema_version":"1.0","event_id":"sha256:89f88a0f1787505f80514f1ce98928a8433463cafe0b633c657b76328553fab3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:Y76BYCKDOAW5DJADVUYDKZZNZM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Light Curve Shapes as a Key to Resolving the Origin of Long Secondary Periods in Red Giant Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Udalski, I. Soszynski","submitted_at":"2014-04-16T21:31:45Z","abstract_excerpt":"We present a study of OGLE light curves of red giant stars exhibiting long secondary periods (LSPs) - an enigmatic phenomenon commonly observed in stars on the upper red giant branch and asymptotic giant branch. We show that the light curves of LSP stars are essentially identical to those of the spotted variables with one dark spot on their photospheres. Such a behavior can be explained by a presence of a dusty cloud orbiting the red giant together with a low-mass companion in a close, circular orbit. We argue that the binary scenario is in agreement with most of the observational properties o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1404.4390","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":"2026-05-18T01:43:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"psZQEuBjT+an4/CIRSIosYVk4AiU2Bf0/epWZpjs/OearHxDlRnyPzQ1pCvCzwDpnAsapU6U3aRaksBIsj/wCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T18:26:54.793076Z"},"content_sha256":"f3590e291e3c6a8bbcc1bb9d66d22ff2ff081f78cfd557a40b71b6f1699e994a","schema_version":"1.0","event_id":"sha256:f3590e291e3c6a8bbcc1bb9d66d22ff2ff081f78cfd557a40b71b6f1699e994a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Y76BYCKDOAW5DJADVUYDKZZNZM/bundle.json","state_url":"https://pith.science/pith/Y76BYCKDOAW5DJADVUYDKZZNZM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Y76BYCKDOAW5DJADVUYDKZZNZM/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":"2026-06-08T18:26:54Z","links":{"resolver":"https://pith.science/pith/Y76BYCKDOAW5DJADVUYDKZZNZM","bundle":"https://pith.science/pith/Y76BYCKDOAW5DJADVUYDKZZNZM/bundle.json","state":"https://pith.science/pith/Y76BYCKDOAW5DJADVUYDKZZNZM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Y76BYCKDOAW5DJADVUYDKZZNZM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:Y76BYCKDOAW5DJADVUYDKZZNZM","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":"24dcfc9a6b69ab19c543811a9603481f752ade2fe67b644226f3fd923371b48e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-16T21:31:45Z","title_canon_sha256":"909bcc6f876fec497209f4616f9fb3f061ea15a39e1d37e6b786067693c237a0"},"schema_version":"1.0","source":{"id":"1404.4390","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1404.4390","created_at":"2026-05-18T01:43:29Z"},{"alias_kind":"arxiv_version","alias_value":"1404.4390v1","created_at":"2026-05-18T01:43:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1404.4390","created_at":"2026-05-18T01:43:29Z"},{"alias_kind":"pith_short_12","alias_value":"Y76BYCKDOAW5","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"Y76BYCKDOAW5DJAD","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"Y76BYCKD","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:f3590e291e3c6a8bbcc1bb9d66d22ff2ff081f78cfd557a40b71b6f1699e994a","target":"graph","created_at":"2026-05-18T01:43:29Z","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 present a study of OGLE light curves of red giant stars exhibiting long secondary periods (LSPs) - an enigmatic phenomenon commonly observed in stars on the upper red giant branch and asymptotic giant branch. We show that the light curves of LSP stars are essentially identical to those of the spotted variables with one dark spot on their photospheres. Such a behavior can be explained by a presence of a dusty cloud orbiting the red giant together with a low-mass companion in a close, circular orbit. We argue that the binary scenario is in agreement with most of the observational properties o","authors_text":"A. Udalski, I. Soszynski","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-16T21:31:45Z","title":"The Light Curve Shapes as a Key to Resolving the Origin of Long Secondary Periods in Red Giant Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1404.4390","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":"sha256:89f88a0f1787505f80514f1ce98928a8433463cafe0b633c657b76328553fab3","target":"record","created_at":"2026-05-18T01:43:29Z","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":"24dcfc9a6b69ab19c543811a9603481f752ade2fe67b644226f3fd923371b48e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-16T21:31:45Z","title_canon_sha256":"909bcc6f876fec497209f4616f9fb3f061ea15a39e1d37e6b786067693c237a0"},"schema_version":"1.0","source":{"id":"1404.4390","kind":"arxiv","version":1}},"canonical_sha256":"c7fc1c0943702dd1a403ad3035672dcb0ee3db7ed95ef4e45289a69d8b06f4ec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c7fc1c0943702dd1a403ad3035672dcb0ee3db7ed95ef4e45289a69d8b06f4ec","first_computed_at":"2026-05-18T01:43:29.201055Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:43:29.201055Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x4RuWrmGhi+ptGsI+uk1F5ugvBw3GSx/Y1T3jp9LQ83kcA8An6UnF7h4wO3fOTyqk36IItaTh/jQbpcqgccZDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:43:29.201669Z","signed_message":"canonical_sha256_bytes"},"source_id":"1404.4390","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:89f88a0f1787505f80514f1ce98928a8433463cafe0b633c657b76328553fab3","sha256:f3590e291e3c6a8bbcc1bb9d66d22ff2ff081f78cfd557a40b71b6f1699e994a"],"state_sha256":"2ffcdb21a86f8a84b5de18455651a5470cbc88eda1f4cc75086aceb14db7abc8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5/Upo18yhbRcQ4YCcxMTNR3p4HhHiD+Xiw8LQPA/wQIitrXRlBoFAZyNQB4yvTVSxRkeHP1nPcVlYNk2LBmLAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T18:26:54.796496Z","bundle_sha256":"f278a4278fbe457d142ae9b170ace58d2aa4d12edf619bf287b2993470ab068a"}}