{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:IXKAX7KGVUKVWM6REOBEIXLV7J","short_pith_number":"pith:IXKAX7KG","canonical_record":{"source":{"id":"1808.05653","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-16T19:26:44Z","cross_cats_sorted":["physics.ao-ph"],"title_canon_sha256":"947fc67f4f4bab79a17e3317eb53c606cb6074c0ff26dff0fc0af1e2d83135c1","abstract_canon_sha256":"3d65db88e7450eba295a01470db9aed3254fc6b3c28046346b83d72f162b107b"},"schema_version":"1.0"},"canonical_sha256":"45d40bfd46ad155b33d12382445d75fa4aec81a650a14420b3c20df7f13403be","source":{"kind":"arxiv","id":"1808.05653","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.05653","created_at":"2026-05-18T00:06:36Z"},{"alias_kind":"arxiv_version","alias_value":"1808.05653v1","created_at":"2026-05-18T00:06:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.05653","created_at":"2026-05-18T00:06:36Z"},{"alias_kind":"pith_short_12","alias_value":"IXKAX7KGVUKV","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"IXKAX7KGVUKVWM6R","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"IXKAX7KG","created_at":"2026-05-18T12:32:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:IXKAX7KGVUKVWM6REOBEIXLV7J","target":"record","payload":{"canonical_record":{"source":{"id":"1808.05653","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-16T19:26:44Z","cross_cats_sorted":["physics.ao-ph"],"title_canon_sha256":"947fc67f4f4bab79a17e3317eb53c606cb6074c0ff26dff0fc0af1e2d83135c1","abstract_canon_sha256":"3d65db88e7450eba295a01470db9aed3254fc6b3c28046346b83d72f162b107b"},"schema_version":"1.0"},"canonical_sha256":"45d40bfd46ad155b33d12382445d75fa4aec81a650a14420b3c20df7f13403be","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:06:36.974058Z","signature_b64":"nDyUceQ8rbFwfuQIda9KCdNi9X39gullgEEauhUjWVPD/qo7t3iOhuqEqriv1AYg42FjsmCQ61g402tQtlH5Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"45d40bfd46ad155b33d12382445d75fa4aec81a650a14420b3c20df7f13403be","last_reissued_at":"2026-05-18T00:06:36.973494Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:06:36.973494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.05653","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":"2026-05-18T00:06:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HeseHPXuvbM21jWNIOcejY6V28lzhpNGeRMZTfa87QzcxQLkbyhqVS79dWg1ei4wuPfJiLfxksjLnssEsHp5DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T21:41:26.130340Z"},"content_sha256":"104a35df2da8b08ce4034b292230e54e2e341cb835724ad1be259419945c6b31","schema_version":"1.0","event_id":"sha256:104a35df2da8b08ce4034b292230e54e2e341cb835724ad1be259419945c6b31"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:IXKAX7KGVUKVWM6REOBEIXLV7J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Atomic iron and titanium in the atmosphere of the exoplanet KELT-9b","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ao-ph"],"primary_cat":"astro-ph.EP","authors_text":"Aurelien Wyttenbach, Daniel Kitzmann, David Ehrenreich, Emilio Molinari, H. Jens Hoeijmakers, Kevin Heng, Lorenzo Pino, Luca Di Fabrizio, Maria Oreshenko, Paul B. Rimmer, Romain Allart, Russell Deitrick, Simon L. Grimm","submitted_at":"2018-08-16T19:26:44Z","abstract_excerpt":"The chemical composition of an exoplanet is a key ingredient in constraining its formation history. Iron is the most abundant transition metal, but has never been directly detected in an exoplanet due to its highly refractory nature. KELT-9b (HD 195689b) is the archetype of the class of ultra-hot Jupiters that straddle the transition between stars and gas-giant exoplanets and serve as distinctive laboratories for studying atmospheric chemistry, because of its high equilibrium temperature of 4050 +/- 180 K. These properties imply that its atmosphere is a tightly constrained chemical system that"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05653","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":"2026-05-18T00:06:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+js44wg7KAOJ5ih9nYPukgz70l19NYtDOC82i0Nb8+Mn67HOo0ArHjpGbzcQR1gC3fFvQjBvQ0hLhJqValmaAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T21:41:26.130698Z"},"content_sha256":"c36659a39b13a20927d57985e9ee6d410b7cf0cc9b4449cdedde0b99252f9785","schema_version":"1.0","event_id":"sha256:c36659a39b13a20927d57985e9ee6d410b7cf0cc9b4449cdedde0b99252f9785"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IXKAX7KGVUKVWM6REOBEIXLV7J/bundle.json","state_url":"https://pith.science/pith/IXKAX7KGVUKVWM6REOBEIXLV7J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IXKAX7KGVUKVWM6REOBEIXLV7J/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":"2026-05-20T21:41:26Z","links":{"resolver":"https://pith.science/pith/IXKAX7KGVUKVWM6REOBEIXLV7J","bundle":"https://pith.science/pith/IXKAX7KGVUKVWM6REOBEIXLV7J/bundle.json","state":"https://pith.science/pith/IXKAX7KGVUKVWM6REOBEIXLV7J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IXKAX7KGVUKVWM6REOBEIXLV7J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:IXKAX7KGVUKVWM6REOBEIXLV7J","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":"3d65db88e7450eba295a01470db9aed3254fc6b3c28046346b83d72f162b107b","cross_cats_sorted":["physics.ao-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-16T19:26:44Z","title_canon_sha256":"947fc67f4f4bab79a17e3317eb53c606cb6074c0ff26dff0fc0af1e2d83135c1"},"schema_version":"1.0","source":{"id":"1808.05653","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.05653","created_at":"2026-05-18T00:06:36Z"},{"alias_kind":"arxiv_version","alias_value":"1808.05653v1","created_at":"2026-05-18T00:06:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.05653","created_at":"2026-05-18T00:06:36Z"},{"alias_kind":"pith_short_12","alias_value":"IXKAX7KGVUKV","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"IXKAX7KGVUKVWM6R","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"IXKAX7KG","created_at":"2026-05-18T12:32:31Z"}],"graph_snapshots":[{"event_id":"sha256:c36659a39b13a20927d57985e9ee6d410b7cf0cc9b4449cdedde0b99252f9785","target":"graph","created_at":"2026-05-18T00:06:36Z","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 chemical composition of an exoplanet is a key ingredient in constraining its formation history. Iron is the most abundant transition metal, but has never been directly detected in an exoplanet due to its highly refractory nature. KELT-9b (HD 195689b) is the archetype of the class of ultra-hot Jupiters that straddle the transition between stars and gas-giant exoplanets and serve as distinctive laboratories for studying atmospheric chemistry, because of its high equilibrium temperature of 4050 +/- 180 K. These properties imply that its atmosphere is a tightly constrained chemical system that","authors_text":"Aurelien Wyttenbach, Daniel Kitzmann, David Ehrenreich, Emilio Molinari, H. Jens Hoeijmakers, Kevin Heng, Lorenzo Pino, Luca Di Fabrizio, Maria Oreshenko, Paul B. Rimmer, Romain Allart, Russell Deitrick, Simon L. Grimm","cross_cats":["physics.ao-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-16T19:26:44Z","title":"Atomic iron and titanium in the atmosphere of the exoplanet KELT-9b"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05653","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":"sha256:104a35df2da8b08ce4034b292230e54e2e341cb835724ad1be259419945c6b31","target":"record","created_at":"2026-05-18T00:06:36Z","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":"3d65db88e7450eba295a01470db9aed3254fc6b3c28046346b83d72f162b107b","cross_cats_sorted":["physics.ao-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-08-16T19:26:44Z","title_canon_sha256":"947fc67f4f4bab79a17e3317eb53c606cb6074c0ff26dff0fc0af1e2d83135c1"},"schema_version":"1.0","source":{"id":"1808.05653","kind":"arxiv","version":1}},"canonical_sha256":"45d40bfd46ad155b33d12382445d75fa4aec81a650a14420b3c20df7f13403be","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"45d40bfd46ad155b33d12382445d75fa4aec81a650a14420b3c20df7f13403be","first_computed_at":"2026-05-18T00:06:36.973494Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:36.973494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nDyUceQ8rbFwfuQIda9KCdNi9X39gullgEEauhUjWVPD/qo7t3iOhuqEqriv1AYg42FjsmCQ61g402tQtlH5Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:36.974058Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.05653","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:104a35df2da8b08ce4034b292230e54e2e341cb835724ad1be259419945c6b31","sha256:c36659a39b13a20927d57985e9ee6d410b7cf0cc9b4449cdedde0b99252f9785"],"state_sha256":"86791e7c1db5ddd1224e1c553663355bae892a48fdd165ff6f4181474daada52"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B+FE/SV+dAMrIMy7yCMDfO3R5tfdmnqIdmTdnBL2CBEU1Or0bVyqt3XLtaXlZJEje27NJSTXgnXUcyM0q8RaCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T21:41:26.132779Z","bundle_sha256":"1eaaafd7219e1303f21c69a751d0ad54c30c4f02c1c931cba59822f2b0213ea5"}}