{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:D4WF7XITL7J3FOGNQOC3T2YWQE","short_pith_number":"pith:D4WF7XIT","canonical_record":{"source":{"id":"1007.4212","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-07-23T20:33:24Z","cross_cats_sorted":[],"title_canon_sha256":"122fb85c8085dbc7a13259d475515c9c34d7a8fe371b7ea2a4e0d16a6d72a22f","abstract_canon_sha256":"384b4312bfd4d258c15a6149308f94857aa5262657dabcd9493d7d71b5139990"},"schema_version":"1.0"},"canonical_sha256":"1f2c5fdd135fd3b2b8cd8385b9eb1681109123eadb1c0d1ca7ec90ce800fad9f","source":{"kind":"arxiv","id":"1007.4212","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.4212","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"arxiv_version","alias_value":"1007.4212v1","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.4212","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"pith_short_12","alias_value":"D4WF7XITL7J3","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"D4WF7XITL7J3FOGN","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"D4WF7XIT","created_at":"2026-05-18T12:26:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:D4WF7XITL7J3FOGNQOC3T2YWQE","target":"record","payload":{"canonical_record":{"source":{"id":"1007.4212","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-07-23T20:33:24Z","cross_cats_sorted":[],"title_canon_sha256":"122fb85c8085dbc7a13259d475515c9c34d7a8fe371b7ea2a4e0d16a6d72a22f","abstract_canon_sha256":"384b4312bfd4d258c15a6149308f94857aa5262657dabcd9493d7d71b5139990"},"schema_version":"1.0"},"canonical_sha256":"1f2c5fdd135fd3b2b8cd8385b9eb1681109123eadb1c0d1ca7ec90ce800fad9f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:06:10.896259Z","signature_b64":"7x3rIgrYgtGQP2C9BDTOuVR/pcZB/RMybkNXACgqqF/sr40OxHpbtgTDY9YRpemm3mGO7XpP3dLtH24pA3ELAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1f2c5fdd135fd3b2b8cd8385b9eb1681109123eadb1c0d1ca7ec90ce800fad9f","last_reissued_at":"2026-05-18T02:06:10.895637Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:06:10.895637Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1007.4212","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":"2026-05-18T02:06:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sJ5IEXncxYyzL0cIged8t1AtPZVEe6HupqUgh2sS/2lDHZNAPuMT17dHtTSoxfWkBXyztWC04U/A1+8BRZVRBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T09:28:23.720357Z"},"content_sha256":"00c0c46c78fecd74ce3bb75cd9d5bf07999f12d4afbfbf23a9adebe05682d070","schema_version":"1.0","event_id":"sha256:00c0c46c78fecd74ce3bb75cd9d5bf07999f12d4afbfbf23a9adebe05682d070"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:D4WF7XITL7J3FOGNQOC3T2YWQE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Light Curve of the Weakly-Accreting T Tauri Binary KH 15D from 2005-10: Insights into the Nature of its Protoplanetary Disk","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Catrina M. Hamilton, Christopher M. Johns-Krull, Joshua N. Winn, Katherine LeDuc, Mansur Ibrahimov, Reinhard Mundt, William Herbst","submitted_at":"2010-07-23T20:33:24Z","abstract_excerpt":"Photometry of the unique pre-main sequence binary system KH 15D is presented, spanning the years 2005-2010. This system has exhibited photometric variations and eclipses over the last 50 years caused by a precessing circumbinary disk. Advancement of the occulting edge across the binary orbit has continued and the photospheres of both stars are now completely obscured at all times. The system is now visible only by scattered light, and yet it continues to show a periodic variation on the orbital cycle with an amplitude exceeding two magnitudes. This variation, which depends only on the binary p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.4212","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":"2026-05-18T02:06:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1az3/d0qWt7k+Hl3D6RLvCx12/03h7vmSOmjvPY86sxaqS4obnGAMjF9Y8yw5KalFIi3+M4Mp54OCiE7peapBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T09:28:23.720716Z"},"content_sha256":"7950e241e3891d17a1edf15f44177b60e72e7ed21391f2e14d725463ed736db2","schema_version":"1.0","event_id":"sha256:7950e241e3891d17a1edf15f44177b60e72e7ed21391f2e14d725463ed736db2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/D4WF7XITL7J3FOGNQOC3T2YWQE/bundle.json","state_url":"https://pith.science/pith/D4WF7XITL7J3FOGNQOC3T2YWQE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/D4WF7XITL7J3FOGNQOC3T2YWQE/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":"2026-06-05T09:28:23Z","links":{"resolver":"https://pith.science/pith/D4WF7XITL7J3FOGNQOC3T2YWQE","bundle":"https://pith.science/pith/D4WF7XITL7J3FOGNQOC3T2YWQE/bundle.json","state":"https://pith.science/pith/D4WF7XITL7J3FOGNQOC3T2YWQE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/D4WF7XITL7J3FOGNQOC3T2YWQE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:D4WF7XITL7J3FOGNQOC3T2YWQE","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":"384b4312bfd4d258c15a6149308f94857aa5262657dabcd9493d7d71b5139990","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-07-23T20:33:24Z","title_canon_sha256":"122fb85c8085dbc7a13259d475515c9c34d7a8fe371b7ea2a4e0d16a6d72a22f"},"schema_version":"1.0","source":{"id":"1007.4212","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.4212","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"arxiv_version","alias_value":"1007.4212v1","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.4212","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"pith_short_12","alias_value":"D4WF7XITL7J3","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"D4WF7XITL7J3FOGN","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"D4WF7XIT","created_at":"2026-05-18T12:26:06Z"}],"graph_snapshots":[{"event_id":"sha256:7950e241e3891d17a1edf15f44177b60e72e7ed21391f2e14d725463ed736db2","target":"graph","created_at":"2026-05-18T02:06:10Z","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":"Photometry of the unique pre-main sequence binary system KH 15D is presented, spanning the years 2005-2010. This system has exhibited photometric variations and eclipses over the last 50 years caused by a precessing circumbinary disk. Advancement of the occulting edge across the binary orbit has continued and the photospheres of both stars are now completely obscured at all times. The system is now visible only by scattered light, and yet it continues to show a periodic variation on the orbital cycle with an amplitude exceeding two magnitudes. This variation, which depends only on the binary p","authors_text":"Catrina M. Hamilton, Christopher M. Johns-Krull, Joshua N. Winn, Katherine LeDuc, Mansur Ibrahimov, Reinhard Mundt, William Herbst","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-07-23T20:33:24Z","title":"The Light Curve of the Weakly-Accreting T Tauri Binary KH 15D from 2005-10: Insights into the Nature of its Protoplanetary Disk"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.4212","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":"sha256:00c0c46c78fecd74ce3bb75cd9d5bf07999f12d4afbfbf23a9adebe05682d070","target":"record","created_at":"2026-05-18T02:06:10Z","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":"384b4312bfd4d258c15a6149308f94857aa5262657dabcd9493d7d71b5139990","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-07-23T20:33:24Z","title_canon_sha256":"122fb85c8085dbc7a13259d475515c9c34d7a8fe371b7ea2a4e0d16a6d72a22f"},"schema_version":"1.0","source":{"id":"1007.4212","kind":"arxiv","version":1}},"canonical_sha256":"1f2c5fdd135fd3b2b8cd8385b9eb1681109123eadb1c0d1ca7ec90ce800fad9f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1f2c5fdd135fd3b2b8cd8385b9eb1681109123eadb1c0d1ca7ec90ce800fad9f","first_computed_at":"2026-05-18T02:06:10.895637Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:06:10.895637Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7x3rIgrYgtGQP2C9BDTOuVR/pcZB/RMybkNXACgqqF/sr40OxHpbtgTDY9YRpemm3mGO7XpP3dLtH24pA3ELAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:06:10.896259Z","signed_message":"canonical_sha256_bytes"},"source_id":"1007.4212","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:00c0c46c78fecd74ce3bb75cd9d5bf07999f12d4afbfbf23a9adebe05682d070","sha256:7950e241e3891d17a1edf15f44177b60e72e7ed21391f2e14d725463ed736db2"],"state_sha256":"06709b2f50aa165516be5ce2193cc9ab032cf521c653472647a350347f66c661"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"31oKheKLOfUDBJN9xQap2xf9uFeTseMpNVDL01nXl/YPirMWD8sVkQmadoJmIYUxFzzoUaPRx5vCmDxInPntDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T09:28:23.722723Z","bundle_sha256":"82bc1dab30365dda63e0957031e95926efefe9363865856412de50256401a125"}}