{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:V7DLWPEMYC3R3EEXEOMXFUCBLZ","short_pith_number":"pith:V7DLWPEM","canonical_record":{"source":{"id":"1801.10177","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-01-30T19:02:58Z","cross_cats_sorted":[],"title_canon_sha256":"a201420a8c297ac33293fddb8cc8bfc3402bf18fe05a3ab35926cbf09f3ebe80","abstract_canon_sha256":"7b2456f2834733ee9ae5c7195a8608c462d04bb4647bb73a3477090c72ddcdb8"},"schema_version":"1.0"},"canonical_sha256":"afc6bb3c8cc0b71d9097239972d0415e41ffb359f4cba7222cc593b1eae5c3cd","source":{"kind":"arxiv","id":"1801.10177","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.10177","created_at":"2026-05-18T00:18:35Z"},{"alias_kind":"arxiv_version","alias_value":"1801.10177v2","created_at":"2026-05-18T00:18:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.10177","created_at":"2026-05-18T00:18:35Z"},{"alias_kind":"pith_short_12","alias_value":"V7DLWPEMYC3R","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"V7DLWPEMYC3R3EEX","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"V7DLWPEM","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:V7DLWPEMYC3R3EEXEOMXFUCBLZ","target":"record","payload":{"canonical_record":{"source":{"id":"1801.10177","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-01-30T19:02:58Z","cross_cats_sorted":[],"title_canon_sha256":"a201420a8c297ac33293fddb8cc8bfc3402bf18fe05a3ab35926cbf09f3ebe80","abstract_canon_sha256":"7b2456f2834733ee9ae5c7195a8608c462d04bb4647bb73a3477090c72ddcdb8"},"schema_version":"1.0"},"canonical_sha256":"afc6bb3c8cc0b71d9097239972d0415e41ffb359f4cba7222cc593b1eae5c3cd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:18:35.651780Z","signature_b64":"kUidBMnct+5r3pkPbOG8oCDvzo1cw9Vzl6vaVvUUj/9BjI3MLfnwPYlCwY7jZWkhr1kW9yCtxOKCKWmP8AOQDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"afc6bb3c8cc0b71d9097239972d0415e41ffb359f4cba7222cc593b1eae5c3cd","last_reissued_at":"2026-05-18T00:18:35.651212Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:18:35.651212Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.10177","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:18:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MivuRqfTFamIQfrJZ+Y0KcY/Ii13OGaCIfYuZDyHmF/I330mjlVAKJkrhAhd8itYoPTYU3NZEpBj5BDkMfOxDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:12:12.088616Z"},"content_sha256":"fe421bd8c1c633b80e4f36512a3a979c073b0bb0572d22d2dbcfb67ca8ce12e2","schema_version":"1.0","event_id":"sha256:fe421bd8c1c633b80e4f36512a3a979c073b0bb0572d22d2dbcfb67ca8ce12e2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:V7DLWPEMYC3R3EEXEOMXFUCBLZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Improved Transit Measurement for a 2.4 R_{Earth} Planet Orbiting A Bright Mid-M Dwarf K2$-$28","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Bj\\\"orn Benneke, Caroline V. Morley, Charles Beichman, Courtney D. Dressing, David Ciardi, Farisa Y. Morales, Ge Chen, Heather A. Knutson, Ian Crossfield, Jessica E. Krick, Jessie Christiansen, John Livingston, Joshua E. Schlieder, Michael Werner, Steve B. Howell, Varoujan Gorjian","submitted_at":"2018-01-30T19:02:58Z","abstract_excerpt":"We present a new {\\em Spitzer} transit observation of K2$-$28b, a sub-Neptune ($R_{\\rm p} = 2.45\\pm0.28 R_{Earth}$) orbiting a relatively bright ($V_{\\rm mag} = 16.06$, $K_{\\rm mag} = 10.75$) metal-rich M4 dwarf (EPIC 206318379). This star is one of only seven with masses less than 0.2 M_{Sun} known to host transiting planets, and the planet appears to be a slightly smaller analogue of GJ 1214b ($2.85\\pm0.20 R_{Earth}$; \\citealt{2013A&A...549A..10H}). Our new {\\em Spitzer} observations were taken two years after the original K2 discovery data and have a significantly higher cadence, allowing u"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.10177","kind":"arxiv","version":2},"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":"2026-05-18T00:18:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2f5V+ayPUbGgveQIisB62ueFLLMTYbXVUtNLJDhaDvtk6+1lpQf5Mk0upZWOvS10v5zG4YylZWFY2BOyQOZJCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:12:12.088976Z"},"content_sha256":"7fd0257b58aff79dd47f87925368a8cfb1f6ca59259121125416571949029c80","schema_version":"1.0","event_id":"sha256:7fd0257b58aff79dd47f87925368a8cfb1f6ca59259121125416571949029c80"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V7DLWPEMYC3R3EEXEOMXFUCBLZ/bundle.json","state_url":"https://pith.science/pith/V7DLWPEMYC3R3EEXEOMXFUCBLZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V7DLWPEMYC3R3EEXEOMXFUCBLZ/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":"2026-05-26T11:12:12Z","links":{"resolver":"https://pith.science/pith/V7DLWPEMYC3R3EEXEOMXFUCBLZ","bundle":"https://pith.science/pith/V7DLWPEMYC3R3EEXEOMXFUCBLZ/bundle.json","state":"https://pith.science/pith/V7DLWPEMYC3R3EEXEOMXFUCBLZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V7DLWPEMYC3R3EEXEOMXFUCBLZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:V7DLWPEMYC3R3EEXEOMXFUCBLZ","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":"7b2456f2834733ee9ae5c7195a8608c462d04bb4647bb73a3477090c72ddcdb8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-01-30T19:02:58Z","title_canon_sha256":"a201420a8c297ac33293fddb8cc8bfc3402bf18fe05a3ab35926cbf09f3ebe80"},"schema_version":"1.0","source":{"id":"1801.10177","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.10177","created_at":"2026-05-18T00:18:35Z"},{"alias_kind":"arxiv_version","alias_value":"1801.10177v2","created_at":"2026-05-18T00:18:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.10177","created_at":"2026-05-18T00:18:35Z"},{"alias_kind":"pith_short_12","alias_value":"V7DLWPEMYC3R","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"V7DLWPEMYC3R3EEX","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"V7DLWPEM","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:7fd0257b58aff79dd47f87925368a8cfb1f6ca59259121125416571949029c80","target":"graph","created_at":"2026-05-18T00:18:35Z","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 a new {\\em Spitzer} transit observation of K2$-$28b, a sub-Neptune ($R_{\\rm p} = 2.45\\pm0.28 R_{Earth}$) orbiting a relatively bright ($V_{\\rm mag} = 16.06$, $K_{\\rm mag} = 10.75$) metal-rich M4 dwarf (EPIC 206318379). This star is one of only seven with masses less than 0.2 M_{Sun} known to host transiting planets, and the planet appears to be a slightly smaller analogue of GJ 1214b ($2.85\\pm0.20 R_{Earth}$; \\citealt{2013A&A...549A..10H}). Our new {\\em Spitzer} observations were taken two years after the original K2 discovery data and have a significantly higher cadence, allowing u","authors_text":"Bj\\\"orn Benneke, Caroline V. Morley, Charles Beichman, Courtney D. Dressing, David Ciardi, Farisa Y. Morales, Ge Chen, Heather A. Knutson, Ian Crossfield, Jessica E. Krick, Jessie Christiansen, John Livingston, Joshua E. Schlieder, Michael Werner, Steve B. Howell, Varoujan Gorjian","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-01-30T19:02:58Z","title":"An Improved Transit Measurement for a 2.4 R_{Earth} Planet Orbiting A Bright Mid-M Dwarf K2$-$28"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.10177","kind":"arxiv","version":2},"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:fe421bd8c1c633b80e4f36512a3a979c073b0bb0572d22d2dbcfb67ca8ce12e2","target":"record","created_at":"2026-05-18T00:18:35Z","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":"7b2456f2834733ee9ae5c7195a8608c462d04bb4647bb73a3477090c72ddcdb8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-01-30T19:02:58Z","title_canon_sha256":"a201420a8c297ac33293fddb8cc8bfc3402bf18fe05a3ab35926cbf09f3ebe80"},"schema_version":"1.0","source":{"id":"1801.10177","kind":"arxiv","version":2}},"canonical_sha256":"afc6bb3c8cc0b71d9097239972d0415e41ffb359f4cba7222cc593b1eae5c3cd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"afc6bb3c8cc0b71d9097239972d0415e41ffb359f4cba7222cc593b1eae5c3cd","first_computed_at":"2026-05-18T00:18:35.651212Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:18:35.651212Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kUidBMnct+5r3pkPbOG8oCDvzo1cw9Vzl6vaVvUUj/9BjI3MLfnwPYlCwY7jZWkhr1kW9yCtxOKCKWmP8AOQDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:18:35.651780Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.10177","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fe421bd8c1c633b80e4f36512a3a979c073b0bb0572d22d2dbcfb67ca8ce12e2","sha256:7fd0257b58aff79dd47f87925368a8cfb1f6ca59259121125416571949029c80"],"state_sha256":"ddfeb51b4a5b3ddd3d1246cb0b47b4e4ffcbd68b87d98a87fcf5a592d115ad1a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9K6qlmCBg4GBTVWEObTKqZUdiZB/kjCb80VyQK1LcrecNEhMVqkJNLjpkSw6pYWBQ0A9PaLmSIY2Wi0JJtkZDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T11:12:12.091736Z","bundle_sha256":"189607bbcbc935c05574d22d24707949568a92ac1d55975cb3d3181fed50f59a"}}