{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:2QXYG3426DCBBLGJB3QA4FYFCE","short_pith_number":"pith:2QXYG342","canonical_record":{"source":{"id":"1802.09529","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-02-26T19:00:00Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"8cb5fe9ffc26f7f9867016e3b8a6309d7f8ea36eae0cc8ca4a4f56e940562810","abstract_canon_sha256":"32ad1a78921c112b03c545ab3068d5fa680bf0e7a94f8fcdbaf9385f4471120d"},"schema_version":"1.0"},"canonical_sha256":"d42f836f9af0c410acc90ee00e17051134d997ac55d2815340bf73b1492fb46b","source":{"kind":"arxiv","id":"1802.09529","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.09529","created_at":"2026-05-18T00:20:01Z"},{"alias_kind":"arxiv_version","alias_value":"1802.09529v1","created_at":"2026-05-18T00:20:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.09529","created_at":"2026-05-18T00:20:01Z"},{"alias_kind":"pith_short_12","alias_value":"2QXYG3426DCB","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"2QXYG3426DCBBLGJ","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"2QXYG342","created_at":"2026-05-18T12:32:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:2QXYG3426DCBBLGJB3QA4FYFCE","target":"record","payload":{"canonical_record":{"source":{"id":"1802.09529","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-02-26T19:00:00Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"8cb5fe9ffc26f7f9867016e3b8a6309d7f8ea36eae0cc8ca4a4f56e940562810","abstract_canon_sha256":"32ad1a78921c112b03c545ab3068d5fa680bf0e7a94f8fcdbaf9385f4471120d"},"schema_version":"1.0"},"canonical_sha256":"d42f836f9af0c410acc90ee00e17051134d997ac55d2815340bf73b1492fb46b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:20:01.946498Z","signature_b64":"8VXXqM8yYyXVVu0Et2nz2CGEvhqZlBsKLhzuXfPDF9iGR2uOFJTPPfHb5NMEdeYjtA1CQX5iK/hYUmUlfGmACQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d42f836f9af0c410acc90ee00e17051134d997ac55d2815340bf73b1492fb46b","last_reissued_at":"2026-05-18T00:20:01.945761Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:20:01.945761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.09529","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":"2026-05-18T00:20:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"57lYb5jfFEytUBTUd8WWrvDsAsnx1mbU+SnGfSs8r8BBq/8PDgFeQ8tRkSOKAPPmiwAYWUH+Jp5IwohdFglxAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:35:43.181079Z"},"content_sha256":"0f50b6f69d5320fa77f8a3d5d251d0990b60c39884179189e977a2ce8b8863ff","schema_version":"1.0","event_id":"sha256:0f50b6f69d5320fa77f8a3d5d251d0990b60c39884179189e977a2ce8b8863ff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:2QXYG3426DCBBLGJB3QA4FYFCE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Identifying Young $Kepler$ Planet Host Stars from Keck-HIRES Spectra of Lithium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"Andrew W. Howard, Ann Merchant Boesgaard, Travis A. Berger","submitted_at":"2018-02-26T19:00:00Z","abstract_excerpt":"The lithium doublet at 6708 \\AA\\ provides an age diagnostic for main sequence FGK dwarfs. We measured the abundance of lithium in 1305 stars with detected transiting planets from the Kepler Mission using high-resolution spectroscopy. Our catalog of lithium measurements from this sample have a range of abundance from A(Li) = 3.11 $\\pm$ 0.07 to an upper limit of $-$0.84 dex. For a magnitude-limited sample that comprises 960 of the 1305 stars, our Keck-HIRES spectra have a median S/N = 45 per pixel at $\\sim$6700 \\AA\\ with spectral resolution $\\frac{\\lambda}{\\Delta \\lambda}$ = $R$ = 55,000. We ide"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.09529","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":"2026-05-18T00:20:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jdFScyy8vIChl/NQ5S4qr+sayeQtneY+T2Q42qVRHSVUgkwx8p3yCf/5LxDNxekqBCEOZ9kcmK3jUCyUGdEHDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:35:43.181752Z"},"content_sha256":"2ddaae4f992f6fcc7ab25692e3169e4970e3c637ede88ebd5eb23a517c9b06c0","schema_version":"1.0","event_id":"sha256:2ddaae4f992f6fcc7ab25692e3169e4970e3c637ede88ebd5eb23a517c9b06c0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2QXYG3426DCBBLGJB3QA4FYFCE/bundle.json","state_url":"https://pith.science/pith/2QXYG3426DCBBLGJB3QA4FYFCE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2QXYG3426DCBBLGJB3QA4FYFCE/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":"2026-05-26T22:35:43Z","links":{"resolver":"https://pith.science/pith/2QXYG3426DCBBLGJB3QA4FYFCE","bundle":"https://pith.science/pith/2QXYG3426DCBBLGJB3QA4FYFCE/bundle.json","state":"https://pith.science/pith/2QXYG3426DCBBLGJB3QA4FYFCE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2QXYG3426DCBBLGJB3QA4FYFCE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:2QXYG3426DCBBLGJB3QA4FYFCE","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":"32ad1a78921c112b03c545ab3068d5fa680bf0e7a94f8fcdbaf9385f4471120d","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-02-26T19:00:00Z","title_canon_sha256":"8cb5fe9ffc26f7f9867016e3b8a6309d7f8ea36eae0cc8ca4a4f56e940562810"},"schema_version":"1.0","source":{"id":"1802.09529","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.09529","created_at":"2026-05-18T00:20:01Z"},{"alias_kind":"arxiv_version","alias_value":"1802.09529v1","created_at":"2026-05-18T00:20:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.09529","created_at":"2026-05-18T00:20:01Z"},{"alias_kind":"pith_short_12","alias_value":"2QXYG3426DCB","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"2QXYG3426DCBBLGJ","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"2QXYG342","created_at":"2026-05-18T12:32:02Z"}],"graph_snapshots":[{"event_id":"sha256:2ddaae4f992f6fcc7ab25692e3169e4970e3c637ede88ebd5eb23a517c9b06c0","target":"graph","created_at":"2026-05-18T00:20:01Z","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":"The lithium doublet at 6708 \\AA\\ provides an age diagnostic for main sequence FGK dwarfs. We measured the abundance of lithium in 1305 stars with detected transiting planets from the Kepler Mission using high-resolution spectroscopy. Our catalog of lithium measurements from this sample have a range of abundance from A(Li) = 3.11 $\\pm$ 0.07 to an upper limit of $-$0.84 dex. For a magnitude-limited sample that comprises 960 of the 1305 stars, our Keck-HIRES spectra have a median S/N = 45 per pixel at $\\sim$6700 \\AA\\ with spectral resolution $\\frac{\\lambda}{\\Delta \\lambda}$ = $R$ = 55,000. We ide","authors_text":"Andrew W. Howard, Ann Merchant Boesgaard, Travis A. Berger","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-02-26T19:00:00Z","title":"Identifying Young $Kepler$ Planet Host Stars from Keck-HIRES Spectra of Lithium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.09529","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":"sha256:0f50b6f69d5320fa77f8a3d5d251d0990b60c39884179189e977a2ce8b8863ff","target":"record","created_at":"2026-05-18T00:20:01Z","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":"32ad1a78921c112b03c545ab3068d5fa680bf0e7a94f8fcdbaf9385f4471120d","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-02-26T19:00:00Z","title_canon_sha256":"8cb5fe9ffc26f7f9867016e3b8a6309d7f8ea36eae0cc8ca4a4f56e940562810"},"schema_version":"1.0","source":{"id":"1802.09529","kind":"arxiv","version":1}},"canonical_sha256":"d42f836f9af0c410acc90ee00e17051134d997ac55d2815340bf73b1492fb46b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d42f836f9af0c410acc90ee00e17051134d997ac55d2815340bf73b1492fb46b","first_computed_at":"2026-05-18T00:20:01.945761Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:20:01.945761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8VXXqM8yYyXVVu0Et2nz2CGEvhqZlBsKLhzuXfPDF9iGR2uOFJTPPfHb5NMEdeYjtA1CQX5iK/hYUmUlfGmACQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:20:01.946498Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.09529","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0f50b6f69d5320fa77f8a3d5d251d0990b60c39884179189e977a2ce8b8863ff","sha256:2ddaae4f992f6fcc7ab25692e3169e4970e3c637ede88ebd5eb23a517c9b06c0"],"state_sha256":"5d8c98657bac4dc6651af65cdfff72ecba73e36640bb03a1a5d9d3678d6d17c6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+XkZ1haw58LZzQkqS8Vis3NzV7hYNy+ZflCWq1/mitU27p5cn2FmdkGInOFPI7MekUnV97/FikgvLUOsvpwyAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T22:35:43.185172Z","bundle_sha256":"9623dc57f70bc1cb772d576578bdd089726b422e7ae9c462c8ec2d91367983f5"}}