{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:W4WVZVITQMSRLH2HSXKR4OZ3J4","short_pith_number":"pith:W4WVZVIT","canonical_record":{"source":{"id":"1709.08195","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-09-24T13:40:52Z","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"title_canon_sha256":"18af1d85e0273ee8d06d72f9486975a153479fb87ebe0413667b250eebd03dc2","abstract_canon_sha256":"9949a5470fb170a718284b90832c9e0221518cabba38cd169cc6f5721f153dee"},"schema_version":"1.0"},"canonical_sha256":"b72d5cd5138325159f4795d51e3b3b4f0d20d45d14e36ed923120b88fc80311a","source":{"kind":"arxiv","id":"1709.08195","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.08195","created_at":"2026-05-18T00:27:43Z"},{"alias_kind":"arxiv_version","alias_value":"1709.08195v1","created_at":"2026-05-18T00:27:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.08195","created_at":"2026-05-18T00:27:43Z"},{"alias_kind":"pith_short_12","alias_value":"W4WVZVITQMSR","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"W4WVZVITQMSRLH2H","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"W4WVZVIT","created_at":"2026-05-18T12:31:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:W4WVZVITQMSRLH2HSXKR4OZ3J4","target":"record","payload":{"canonical_record":{"source":{"id":"1709.08195","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-09-24T13:40:52Z","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"title_canon_sha256":"18af1d85e0273ee8d06d72f9486975a153479fb87ebe0413667b250eebd03dc2","abstract_canon_sha256":"9949a5470fb170a718284b90832c9e0221518cabba38cd169cc6f5721f153dee"},"schema_version":"1.0"},"canonical_sha256":"b72d5cd5138325159f4795d51e3b3b4f0d20d45d14e36ed923120b88fc80311a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:27:43.178547Z","signature_b64":"r3qOPUoXQGNrNRhao415wGJnpx7FLFCTUvRT+PA6/zIuXTrbwJ5AazuXUYM6ms9Zpys6MKpeX+noE3tCN0CmCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b72d5cd5138325159f4795d51e3b3b4f0d20d45d14e36ed923120b88fc80311a","last_reissued_at":"2026-05-18T00:27:43.177797Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:27:43.177797Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1709.08195","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":"2026-05-18T00:27:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mjwaI6ZTiW3VnczyZCyy2x2g6nwezTMWXfcKBV0qU1jG4ZXYMriDbvVR4K4HsRyANoi3Nws1/Tb5bPdwQTg+DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T20:31:06.804093Z"},"content_sha256":"a26fda1dda0badf3d6c438b9887854ec1eaca3aa4032c3e1eea3f2d3006eab22","schema_version":"1.0","event_id":"sha256:a26fda1dda0badf3d6c438b9887854ec1eaca3aa4032c3e1eea3f2d3006eab22"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:W4WVZVITQMSRLH2HSXKR4OZ3J4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"WD 1145+017: Optical Activity During 2016-2017 and Limits on the X-Ray Flux","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"A. Vanderburg, B.L. Gary, D. Pooley, K. Mukai, S. Rappaport, S. Xu","submitted_at":"2017-09-24T13:40:52Z","abstract_excerpt":"WD 1145+017 was observed from 2016 November through 2017 June for the purpose of further characterizing the transit behavior of the dusty debris clouds orbiting this white dwarf. The optical observations were carried out with a small ground-based telescope run by an amateur astronomer, and covered 53 different nights over the 8-month interval. We have found that the optical activity has increased to the highest level observed since its discovery with Kepler K2, with approximately 17% of the optical flux extinguished per orbit. The source exhibits some transits with depths of up to 55% and dura"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.08195","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":"2026-05-18T00:27:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GeC+eGw11fu4iYxlm3qECQVB/s3eJYsCpljiTf2YonRFEawTXmPg/OksJKFBttJpjawblaytUwl65JafwbFZDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T20:31:06.804728Z"},"content_sha256":"f8fea42e8b6aab79b7318405c26f6ad15acaac96c4981dd45e8ddd8f93d63285","schema_version":"1.0","event_id":"sha256:f8fea42e8b6aab79b7318405c26f6ad15acaac96c4981dd45e8ddd8f93d63285"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W4WVZVITQMSRLH2HSXKR4OZ3J4/bundle.json","state_url":"https://pith.science/pith/W4WVZVITQMSRLH2HSXKR4OZ3J4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W4WVZVITQMSRLH2HSXKR4OZ3J4/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":"2026-05-25T20:31:06Z","links":{"resolver":"https://pith.science/pith/W4WVZVITQMSRLH2HSXKR4OZ3J4","bundle":"https://pith.science/pith/W4WVZVITQMSRLH2HSXKR4OZ3J4/bundle.json","state":"https://pith.science/pith/W4WVZVITQMSRLH2HSXKR4OZ3J4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W4WVZVITQMSRLH2HSXKR4OZ3J4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:W4WVZVITQMSRLH2HSXKR4OZ3J4","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":"9949a5470fb170a718284b90832c9e0221518cabba38cd169cc6f5721f153dee","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-09-24T13:40:52Z","title_canon_sha256":"18af1d85e0273ee8d06d72f9486975a153479fb87ebe0413667b250eebd03dc2"},"schema_version":"1.0","source":{"id":"1709.08195","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.08195","created_at":"2026-05-18T00:27:43Z"},{"alias_kind":"arxiv_version","alias_value":"1709.08195v1","created_at":"2026-05-18T00:27:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.08195","created_at":"2026-05-18T00:27:43Z"},{"alias_kind":"pith_short_12","alias_value":"W4WVZVITQMSR","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"W4WVZVITQMSRLH2H","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"W4WVZVIT","created_at":"2026-05-18T12:31:53Z"}],"graph_snapshots":[{"event_id":"sha256:f8fea42e8b6aab79b7318405c26f6ad15acaac96c4981dd45e8ddd8f93d63285","target":"graph","created_at":"2026-05-18T00:27:43Z","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":"WD 1145+017 was observed from 2016 November through 2017 June for the purpose of further characterizing the transit behavior of the dusty debris clouds orbiting this white dwarf. The optical observations were carried out with a small ground-based telescope run by an amateur astronomer, and covered 53 different nights over the 8-month interval. We have found that the optical activity has increased to the highest level observed since its discovery with Kepler K2, with approximately 17% of the optical flux extinguished per orbit. The source exhibits some transits with depths of up to 55% and dura","authors_text":"A. Vanderburg, B.L. Gary, D. Pooley, K. Mukai, S. Rappaport, S. Xu","cross_cats":["astro-ph.HE","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-09-24T13:40:52Z","title":"WD 1145+017: Optical Activity During 2016-2017 and Limits on the X-Ray Flux"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.08195","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:a26fda1dda0badf3d6c438b9887854ec1eaca3aa4032c3e1eea3f2d3006eab22","target":"record","created_at":"2026-05-18T00:27:43Z","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":"9949a5470fb170a718284b90832c9e0221518cabba38cd169cc6f5721f153dee","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-09-24T13:40:52Z","title_canon_sha256":"18af1d85e0273ee8d06d72f9486975a153479fb87ebe0413667b250eebd03dc2"},"schema_version":"1.0","source":{"id":"1709.08195","kind":"arxiv","version":1}},"canonical_sha256":"b72d5cd5138325159f4795d51e3b3b4f0d20d45d14e36ed923120b88fc80311a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b72d5cd5138325159f4795d51e3b3b4f0d20d45d14e36ed923120b88fc80311a","first_computed_at":"2026-05-18T00:27:43.177797Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:27:43.177797Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"r3qOPUoXQGNrNRhao415wGJnpx7FLFCTUvRT+PA6/zIuXTrbwJ5AazuXUYM6ms9Zpys6MKpeX+noE3tCN0CmCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:27:43.178547Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.08195","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a26fda1dda0badf3d6c438b9887854ec1eaca3aa4032c3e1eea3f2d3006eab22","sha256:f8fea42e8b6aab79b7318405c26f6ad15acaac96c4981dd45e8ddd8f93d63285"],"state_sha256":"bdc176f9d7361411cfd903e070898e85f660eba440ff8a9ad123af8f56e581e0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s6KDG0mkT2M0EPhyOcoCQLDSRAV6idX60KEMb1CRDnFTtM4kjnY4hvl6+k8+g/XvHZHYkQCIgX/ggifYRXmuCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T20:31:06.808306Z","bundle_sha256":"2c657f084a18bac308c2dcbf15f432b9b57667b8215dfa24d65ef398b5652873"}}