{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:OVRGSZUN7BH5LQWGA2XU6QOHLW","short_pith_number":"pith:OVRGSZUN","canonical_record":{"source":{"id":"1901.00005","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-31T19:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"acbfa3438a854ba39ddd26629fe321eb614de96473db2234703d69d8f667ea9b","abstract_canon_sha256":"39a40e253af7b30b0ec32861a6af7c5a99863bef1dcb5d668bff98dce3ac5dd2"},"schema_version":"1.0"},"canonical_sha256":"756269668df84fd5c2c606af4f41c75db6bd20020d75ad60db005299e60bef84","source":{"kind":"arxiv","id":"1901.00005","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.00005","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"arxiv_version","alias_value":"1901.00005v2","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.00005","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"pith_short_12","alias_value":"OVRGSZUN7BH5","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"pith_short_16","alias_value":"OVRGSZUN7BH5LQWG","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"pith_short_8","alias_value":"OVRGSZUN","created_at":"2026-07-05T02:17:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:OVRGSZUN7BH5LQWGA2XU6QOHLW","target":"record","payload":{"canonical_record":{"source":{"id":"1901.00005","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-31T19:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"acbfa3438a854ba39ddd26629fe321eb614de96473db2234703d69d8f667ea9b","abstract_canon_sha256":"39a40e253af7b30b0ec32861a6af7c5a99863bef1dcb5d668bff98dce3ac5dd2"},"schema_version":"1.0"},"canonical_sha256":"756269668df84fd5c2c606af4f41c75db6bd20020d75ad60db005299e60bef84","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:17:06.775233Z","signature_b64":"0/UX6bTd1Yiq4JHCt8yAXP7dKrkinbNF5k19XXXlsCze1s57W2NZIjrKgFfiLAVhgrakXV1n5Z2snZs53/++Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"756269668df84fd5c2c606af4f41c75db6bd20020d75ad60db005299e60bef84","last_reissued_at":"2026-07-05T02:17:06.774733Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:17:06.774733Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.00005","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:17:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4VlqLB6WWT15GjLzPgK8uktr/7qaqHWJEzXvDuSDEUgHFkmucANcSzGBKiqGb/TsHaCYHgvVQOByzOFPBxfIBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T12:50:15.660380Z"},"content_sha256":"24f1bfb5cb1819c06cd18b62c4d38bc0d9d7dfa983786210ab70b821687ca568","schema_version":"1.0","event_id":"sha256:24f1bfb5cb1819c06cd18b62c4d38bc0d9d7dfa983786210ab70b821687ca568"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:OVRGSZUN7BH5LQWGA2XU6QOHLW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Extreme Amplitude, Massive Heartbeat System in the LMC Characterized Using ASAS-SN and TESS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. J. Shappee, C. S. Kochanek, K. Z. Stanek, M. Fausnaugh, T. Jayasinghe, Todd A. Thompson","submitted_at":"2018-12-31T19:00:00Z","abstract_excerpt":"Using ASAS-SN data, we find that the bright ($V{\\sim}13.5$ mag) variable star MACHO 80.7443.1718 (ASASSN-V J052624.38-684705.6) is the most extreme heartbeat star yet discovered. This massive binary, consisting of at least one early B-type star, has an orbital period of $P_{\\rm ASAS-SN}=32.83627\\pm0.00846\\,{\\rm d},$ and is located towards the LH58 OB complex in the LMC. Both the ASAS-SN and TESS light curves show extreme brightness variations of ${\\sim}40\\%$ at periastron and variations of ${\\sim}10\\%$ due to tidally excited oscillations outside periastron. We fit an analytical model of the va"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.00005","kind":"arxiv","version":2},"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/1901.00005/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":"2026-07-05T02:17:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DMwgorQ4ZTba6W+raoIBUcyzZzHN8v6F5G1LYPZMrX+2b6T5rnFpKE66ugAbApqvjbFjzvAku4XLAXQXDCQwCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T12:50:15.661008Z"},"content_sha256":"32ea35816528c8576ecc62785e43aeacbd82a5caf5889159b27873374686935e","schema_version":"1.0","event_id":"sha256:32ea35816528c8576ecc62785e43aeacbd82a5caf5889159b27873374686935e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OVRGSZUN7BH5LQWGA2XU6QOHLW/bundle.json","state_url":"https://pith.science/pith/OVRGSZUN7BH5LQWGA2XU6QOHLW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OVRGSZUN7BH5LQWGA2XU6QOHLW/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":"2026-08-18T12:50:15Z","links":{"resolver":"https://pith.science/pith/OVRGSZUN7BH5LQWGA2XU6QOHLW","bundle":"https://pith.science/pith/OVRGSZUN7BH5LQWGA2XU6QOHLW/bundle.json","state":"https://pith.science/pith/OVRGSZUN7BH5LQWGA2XU6QOHLW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OVRGSZUN7BH5LQWGA2XU6QOHLW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:OVRGSZUN7BH5LQWGA2XU6QOHLW","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":"39a40e253af7b30b0ec32861a6af7c5a99863bef1dcb5d668bff98dce3ac5dd2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-31T19:00:00Z","title_canon_sha256":"acbfa3438a854ba39ddd26629fe321eb614de96473db2234703d69d8f667ea9b"},"schema_version":"1.0","source":{"id":"1901.00005","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.00005","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"arxiv_version","alias_value":"1901.00005v2","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.00005","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"pith_short_12","alias_value":"OVRGSZUN7BH5","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"pith_short_16","alias_value":"OVRGSZUN7BH5LQWG","created_at":"2026-07-05T02:17:06Z"},{"alias_kind":"pith_short_8","alias_value":"OVRGSZUN","created_at":"2026-07-05T02:17:06Z"}],"graph_snapshots":[{"event_id":"sha256:32ea35816528c8576ecc62785e43aeacbd82a5caf5889159b27873374686935e","target":"graph","created_at":"2026-07-05T02:17:06Z","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/1901.00005/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Using ASAS-SN data, we find that the bright ($V{\\sim}13.5$ mag) variable star MACHO 80.7443.1718 (ASASSN-V J052624.38-684705.6) is the most extreme heartbeat star yet discovered. This massive binary, consisting of at least one early B-type star, has an orbital period of $P_{\\rm ASAS-SN}=32.83627\\pm0.00846\\,{\\rm d},$ and is located towards the LH58 OB complex in the LMC. Both the ASAS-SN and TESS light curves show extreme brightness variations of ${\\sim}40\\%$ at periastron and variations of ${\\sim}10\\%$ due to tidally excited oscillations outside periastron. We fit an analytical model of the va","authors_text":"B. J. Shappee, C. S. Kochanek, K. Z. Stanek, M. Fausnaugh, T. Jayasinghe, Todd A. Thompson","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-31T19:00:00Z","title":"An Extreme Amplitude, Massive Heartbeat System in the LMC Characterized Using ASAS-SN and TESS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.00005","kind":"arxiv","version":2},"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":"sha256:24f1bfb5cb1819c06cd18b62c4d38bc0d9d7dfa983786210ab70b821687ca568","target":"record","created_at":"2026-07-05T02:17:06Z","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":"39a40e253af7b30b0ec32861a6af7c5a99863bef1dcb5d668bff98dce3ac5dd2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-31T19:00:00Z","title_canon_sha256":"acbfa3438a854ba39ddd26629fe321eb614de96473db2234703d69d8f667ea9b"},"schema_version":"1.0","source":{"id":"1901.00005","kind":"arxiv","version":2}},"canonical_sha256":"756269668df84fd5c2c606af4f41c75db6bd20020d75ad60db005299e60bef84","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"756269668df84fd5c2c606af4f41c75db6bd20020d75ad60db005299e60bef84","first_computed_at":"2026-07-05T02:17:06.774733Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:17:06.774733Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0/UX6bTd1Yiq4JHCt8yAXP7dKrkinbNF5k19XXXlsCze1s57W2NZIjrKgFfiLAVhgrakXV1n5Z2snZs53/++Cg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:17:06.775233Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.00005","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:24f1bfb5cb1819c06cd18b62c4d38bc0d9d7dfa983786210ab70b821687ca568","sha256:32ea35816528c8576ecc62785e43aeacbd82a5caf5889159b27873374686935e"],"state_sha256":"ae19a4a837d3d032c63fac9d402f005c9fcf26d45a0317dae4e64092327688c9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PNRHsscGbGgmF12FfUEUYqdeGOx6KsxJu1p23yC05jr1TilgETI6CkRQAUttNJffs1ThT6K8uzivHgW+NEpwBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T12:50:15.675455Z","bundle_sha256":"8c17bfd2e786922ad48cfe07d0e61d5602f989ef52bb1102178fa634a3463ea4"}}