{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:NAQC3G4IFHHTDINJGOJHHNL4NQ","short_pith_number":"pith:NAQC3G4I","canonical_record":{"source":{"id":"1805.02452","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-05-07T11:47:55Z","cross_cats_sorted":[],"title_canon_sha256":"57a087acbf9496c51127fe625a8b986e1ddc3e01540cdb84e98748c3d32bde91","abstract_canon_sha256":"1cd24fd47b78ec6d544664f87e68d2022fe98ce48bb5b0d45fdc0e93da753110"},"schema_version":"1.0"},"canonical_sha256":"68202d9b8829cf31a1a9339273b57c6c00d075b5ad3fdae58c4c34b2ab25c936","source":{"kind":"arxiv","id":"1805.02452","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.02452","created_at":"2026-05-18T00:11:34Z"},{"alias_kind":"arxiv_version","alias_value":"1805.02452v1","created_at":"2026-05-18T00:11:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.02452","created_at":"2026-05-18T00:11:34Z"},{"alias_kind":"pith_short_12","alias_value":"NAQC3G4IFHHT","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"NAQC3G4IFHHTDINJ","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"NAQC3G4I","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:NAQC3G4IFHHTDINJGOJHHNL4NQ","target":"record","payload":{"canonical_record":{"source":{"id":"1805.02452","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-05-07T11:47:55Z","cross_cats_sorted":[],"title_canon_sha256":"57a087acbf9496c51127fe625a8b986e1ddc3e01540cdb84e98748c3d32bde91","abstract_canon_sha256":"1cd24fd47b78ec6d544664f87e68d2022fe98ce48bb5b0d45fdc0e93da753110"},"schema_version":"1.0"},"canonical_sha256":"68202d9b8829cf31a1a9339273b57c6c00d075b5ad3fdae58c4c34b2ab25c936","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:11:34.019661Z","signature_b64":"5KFt+5Nq14+OmBXK2iZWOieMkhZ6DJMzMMha79PtbtMnF9RnBccBkZkes3Wk3AA1baohQhodFs0fOvlfiQSyBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"68202d9b8829cf31a1a9339273b57c6c00d075b5ad3fdae58c4c34b2ab25c936","last_reissued_at":"2026-05-18T00:11:34.018995Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:11:34.018995Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.02452","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":"2026-05-18T00:11:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MIGSOmuGnuAtxu3jPwZ5OkN19NASIpkMc4nHAqhoMGvIYUva78+A5+m7K9LyYZ8k8QBr5LqEgHgChXXThhRzBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T07:47:17.851926Z"},"content_sha256":"5b3f697d045a290ac0c2742dde2399b27354b9bb637f3479eddf4f44300d0f0c","schema_version":"1.0","event_id":"sha256:5b3f697d045a290ac0c2742dde2399b27354b9bb637f3479eddf4f44300d0f0c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:NAQC3G4IFHHTDINJGOJHHNL4NQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Colour Variations of Negative Superhumps","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Akira Imada, Kenshi Yanagisawa, Nobuyuki Kawai","submitted_at":"2018-05-07T11:47:55Z","abstract_excerpt":"We present simultaneous $g'$, $R_{\\rm c}$, and $I_{\\rm c}$ photometry of the notable dwarf nova ER UMa during the 2011 season. Our photometry revealed that the brightness maxima of negative superhumps coincide with the bluest peaks in $g' - I_{\\rm c}$ colour variations. We also found that the amplitudes of negative superhumps are the largest in the $g'$ band. These observed properties are significantly different from those observed in early and positive superhumps. Our findings are consistent with a tilted disk model as the light source of negative superhumps."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.02452","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":"2026-05-18T00:11:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Kj/g35YT6F4YC+d4qYggdXVTueUoR9srVSUqCweF6HCDq9aplUbxOFJ11BrgrVlbuhfw2QGZdK06I4Om5o4HDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T07:47:17.852277Z"},"content_sha256":"9242e847c1decd1ed6c9bfbda17d40804efdeb9a1fd9d00c2c072b6a28868a56","schema_version":"1.0","event_id":"sha256:9242e847c1decd1ed6c9bfbda17d40804efdeb9a1fd9d00c2c072b6a28868a56"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NAQC3G4IFHHTDINJGOJHHNL4NQ/bundle.json","state_url":"https://pith.science/pith/NAQC3G4IFHHTDINJGOJHHNL4NQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NAQC3G4IFHHTDINJGOJHHNL4NQ/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":"2026-05-30T07:47:17Z","links":{"resolver":"https://pith.science/pith/NAQC3G4IFHHTDINJGOJHHNL4NQ","bundle":"https://pith.science/pith/NAQC3G4IFHHTDINJGOJHHNL4NQ/bundle.json","state":"https://pith.science/pith/NAQC3G4IFHHTDINJGOJHHNL4NQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NAQC3G4IFHHTDINJGOJHHNL4NQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:NAQC3G4IFHHTDINJGOJHHNL4NQ","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":"1cd24fd47b78ec6d544664f87e68d2022fe98ce48bb5b0d45fdc0e93da753110","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-05-07T11:47:55Z","title_canon_sha256":"57a087acbf9496c51127fe625a8b986e1ddc3e01540cdb84e98748c3d32bde91"},"schema_version":"1.0","source":{"id":"1805.02452","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.02452","created_at":"2026-05-18T00:11:34Z"},{"alias_kind":"arxiv_version","alias_value":"1805.02452v1","created_at":"2026-05-18T00:11:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.02452","created_at":"2026-05-18T00:11:34Z"},{"alias_kind":"pith_short_12","alias_value":"NAQC3G4IFHHT","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"NAQC3G4IFHHTDINJ","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"NAQC3G4I","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:9242e847c1decd1ed6c9bfbda17d40804efdeb9a1fd9d00c2c072b6a28868a56","target":"graph","created_at":"2026-05-18T00:11:34Z","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"},"paper":{"abstract_excerpt":"We present simultaneous $g'$, $R_{\\rm c}$, and $I_{\\rm c}$ photometry of the notable dwarf nova ER UMa during the 2011 season. Our photometry revealed that the brightness maxima of negative superhumps coincide with the bluest peaks in $g' - I_{\\rm c}$ colour variations. We also found that the amplitudes of negative superhumps are the largest in the $g'$ band. These observed properties are significantly different from those observed in early and positive superhumps. Our findings are consistent with a tilted disk model as the light source of negative superhumps.","authors_text":"Akira Imada, Kenshi Yanagisawa, Nobuyuki Kawai","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-05-07T11:47:55Z","title":"On the Colour Variations of Negative Superhumps"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.02452","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":"sha256:5b3f697d045a290ac0c2742dde2399b27354b9bb637f3479eddf4f44300d0f0c","target":"record","created_at":"2026-05-18T00:11:34Z","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":"1cd24fd47b78ec6d544664f87e68d2022fe98ce48bb5b0d45fdc0e93da753110","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-05-07T11:47:55Z","title_canon_sha256":"57a087acbf9496c51127fe625a8b986e1ddc3e01540cdb84e98748c3d32bde91"},"schema_version":"1.0","source":{"id":"1805.02452","kind":"arxiv","version":1}},"canonical_sha256":"68202d9b8829cf31a1a9339273b57c6c00d075b5ad3fdae58c4c34b2ab25c936","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"68202d9b8829cf31a1a9339273b57c6c00d075b5ad3fdae58c4c34b2ab25c936","first_computed_at":"2026-05-18T00:11:34.018995Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:11:34.018995Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5KFt+5Nq14+OmBXK2iZWOieMkhZ6DJMzMMha79PtbtMnF9RnBccBkZkes3Wk3AA1baohQhodFs0fOvlfiQSyBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:11:34.019661Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.02452","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5b3f697d045a290ac0c2742dde2399b27354b9bb637f3479eddf4f44300d0f0c","sha256:9242e847c1decd1ed6c9bfbda17d40804efdeb9a1fd9d00c2c072b6a28868a56"],"state_sha256":"487a830a3cf20acdc6132f2663375dd749afa557ef047029662933f5c5f1cee2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LbqnxCv/wTlz4Q2ibUiNog15/bpAaVD2fBswnyKmBoEDBcI6w1lmwH1mJ21egle/6K937iXsEhwMASIrZcXzDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T07:47:17.854343Z","bundle_sha256":"935846f0c95bd2e2587d06cb2e0a1a3909cb48c12ec6aba01d23030af5f0ee39"}}