{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:L4HR5OSLQFEH2JSSPPEDFLQTND","short_pith_number":"pith:L4HR5OSL","canonical_record":{"source":{"id":"1610.07249","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-24T00:04:33Z","cross_cats_sorted":[],"title_canon_sha256":"ca515c354b38535089b167ccd2e00981eea69e49d4ee8ab5dcbe6d6552a772da","abstract_canon_sha256":"d5dd7c392c80121a7f0c6fbb8e72f1be4ba015715b522e50ee594726b052281a"},"schema_version":"1.0"},"canonical_sha256":"5f0f1eba4b81487d26527bc832ae1368c45565831e2ed66d8f03a4f59b10701b","source":{"kind":"arxiv","id":"1610.07249","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.07249","created_at":"2026-05-18T00:52:38Z"},{"alias_kind":"arxiv_version","alias_value":"1610.07249v1","created_at":"2026-05-18T00:52:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.07249","created_at":"2026-05-18T00:52:38Z"},{"alias_kind":"pith_short_12","alias_value":"L4HR5OSLQFEH","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"L4HR5OSLQFEH2JSS","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"L4HR5OSL","created_at":"2026-05-18T12:30:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:L4HR5OSLQFEH2JSSPPEDFLQTND","target":"record","payload":{"canonical_record":{"source":{"id":"1610.07249","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-24T00:04:33Z","cross_cats_sorted":[],"title_canon_sha256":"ca515c354b38535089b167ccd2e00981eea69e49d4ee8ab5dcbe6d6552a772da","abstract_canon_sha256":"d5dd7c392c80121a7f0c6fbb8e72f1be4ba015715b522e50ee594726b052281a"},"schema_version":"1.0"},"canonical_sha256":"5f0f1eba4b81487d26527bc832ae1368c45565831e2ed66d8f03a4f59b10701b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:52:38.274874Z","signature_b64":"rOpSN9VRcuJpMCXxfDkGS9a0RhnArt2k8TX+GcxeHWMJXXWt/m/GC8V4IZXgeNvMpO1AyCP1+gGlqUExXFknAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5f0f1eba4b81487d26527bc832ae1368c45565831e2ed66d8f03a4f59b10701b","last_reissued_at":"2026-05-18T00:52:38.274440Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:52:38.274440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.07249","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":"2026-05-18T00:52:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w/LHQZp7o8yUUfDtceyPF+LTnY9X+5e7847CHe3TdUVSTuXHry43Wp8jJwfBaYr02bV37z17IQh94mJ6aDIhDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T18:41:53.727748Z"},"content_sha256":"602c14e7dac5e187b714004ab09691fa3f19861abc5aeda88449d79ba3a81815","schema_version":"1.0","event_id":"sha256:602c14e7dac5e187b714004ab09691fa3f19861abc5aeda88449d79ba3a81815"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:L4HR5OSLQFEH2JSSPPEDFLQTND","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spitzer Observations Confirm and Rescue the Habitable-Zone Super-Earth K2-18b for Future Characterization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Andrew W. Howard, Bj\\\"orn Benneke, Charles Beichman, Courtney Dressing, David R. Ciardi, Erik Petigura, Evan Sinukoff, Heather Knutson, Ian J. M. Crossfield, Jessica Krick, Jessie Christiansen, John Livingston, Joshua E. Schlieder, Michael Werner, Rachel L. Akeson, Varoujan Gorjian","submitted_at":"2016-10-24T00:04:33Z","abstract_excerpt":"The recent detections of two transit events attributed to the super-Earth candidate K2-18b have provided the unprecedented prospect of spectroscopically studying a habitable-zone planet outside the Solar System. Orbiting a nearby M2.5 dwarf and receiving virtually the same stellar insolation as Earth, K2-18b would be a prime candidate for the first detailed atmospheric characterization of a habitable-zone exoplanet using HST and JWST. Here, we report the detection of a third transit of K2-18b near the predicted transit time using the Spitzer Space Telescope. The Spitzer detection demonstrates "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.07249","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":"2026-05-18T00:52:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kbOoqYsAEOvMZQKSZsmbTZYQMPKHFT9xYXpqBz+jfg0rD95JUQ7Lhg+GtdpHvv8wP0+rIXqgt46RPbyatjfdAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T18:41:53.728098Z"},"content_sha256":"73c7cf1ef7b326c148161e3cc57f198d552994e3b4a7355e818e070eac7429d8","schema_version":"1.0","event_id":"sha256:73c7cf1ef7b326c148161e3cc57f198d552994e3b4a7355e818e070eac7429d8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L4HR5OSLQFEH2JSSPPEDFLQTND/bundle.json","state_url":"https://pith.science/pith/L4HR5OSLQFEH2JSSPPEDFLQTND/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L4HR5OSLQFEH2JSSPPEDFLQTND/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":"2026-05-19T18:41:53Z","links":{"resolver":"https://pith.science/pith/L4HR5OSLQFEH2JSSPPEDFLQTND","bundle":"https://pith.science/pith/L4HR5OSLQFEH2JSSPPEDFLQTND/bundle.json","state":"https://pith.science/pith/L4HR5OSLQFEH2JSSPPEDFLQTND/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L4HR5OSLQFEH2JSSPPEDFLQTND/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:L4HR5OSLQFEH2JSSPPEDFLQTND","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":"d5dd7c392c80121a7f0c6fbb8e72f1be4ba015715b522e50ee594726b052281a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-24T00:04:33Z","title_canon_sha256":"ca515c354b38535089b167ccd2e00981eea69e49d4ee8ab5dcbe6d6552a772da"},"schema_version":"1.0","source":{"id":"1610.07249","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.07249","created_at":"2026-05-18T00:52:38Z"},{"alias_kind":"arxiv_version","alias_value":"1610.07249v1","created_at":"2026-05-18T00:52:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.07249","created_at":"2026-05-18T00:52:38Z"},{"alias_kind":"pith_short_12","alias_value":"L4HR5OSLQFEH","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"L4HR5OSLQFEH2JSS","created_at":"2026-05-18T12:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"L4HR5OSL","created_at":"2026-05-18T12:30:29Z"}],"graph_snapshots":[{"event_id":"sha256:73c7cf1ef7b326c148161e3cc57f198d552994e3b4a7355e818e070eac7429d8","target":"graph","created_at":"2026-05-18T00:52:38Z","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 recent detections of two transit events attributed to the super-Earth candidate K2-18b have provided the unprecedented prospect of spectroscopically studying a habitable-zone planet outside the Solar System. Orbiting a nearby M2.5 dwarf and receiving virtually the same stellar insolation as Earth, K2-18b would be a prime candidate for the first detailed atmospheric characterization of a habitable-zone exoplanet using HST and JWST. Here, we report the detection of a third transit of K2-18b near the predicted transit time using the Spitzer Space Telescope. The Spitzer detection demonstrates ","authors_text":"Andrew W. Howard, Bj\\\"orn Benneke, Charles Beichman, Courtney Dressing, David R. Ciardi, Erik Petigura, Evan Sinukoff, Heather Knutson, Ian J. M. Crossfield, Jessica Krick, Jessie Christiansen, John Livingston, Joshua E. Schlieder, Michael Werner, Rachel L. Akeson, Varoujan Gorjian","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-24T00:04:33Z","title":"Spitzer Observations Confirm and Rescue the Habitable-Zone Super-Earth K2-18b for Future Characterization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.07249","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":"sha256:602c14e7dac5e187b714004ab09691fa3f19861abc5aeda88449d79ba3a81815","target":"record","created_at":"2026-05-18T00:52:38Z","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":"d5dd7c392c80121a7f0c6fbb8e72f1be4ba015715b522e50ee594726b052281a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-10-24T00:04:33Z","title_canon_sha256":"ca515c354b38535089b167ccd2e00981eea69e49d4ee8ab5dcbe6d6552a772da"},"schema_version":"1.0","source":{"id":"1610.07249","kind":"arxiv","version":1}},"canonical_sha256":"5f0f1eba4b81487d26527bc832ae1368c45565831e2ed66d8f03a4f59b10701b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f0f1eba4b81487d26527bc832ae1368c45565831e2ed66d8f03a4f59b10701b","first_computed_at":"2026-05-18T00:52:38.274440Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:38.274440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rOpSN9VRcuJpMCXxfDkGS9a0RhnArt2k8TX+GcxeHWMJXXWt/m/GC8V4IZXgeNvMpO1AyCP1+gGlqUExXFknAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:38.274874Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.07249","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:602c14e7dac5e187b714004ab09691fa3f19861abc5aeda88449d79ba3a81815","sha256:73c7cf1ef7b326c148161e3cc57f198d552994e3b4a7355e818e070eac7429d8"],"state_sha256":"80c6189671005b1f52b5ccb08e85cee1fb6a542d4d1fd7495bd7e666e29cd5ba"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uHQwAvmLFzmmZEITkSowjMPvXuC/nAd73lojaYdhxW40ETlytcOGpGw/msN9ZST45CmamfOC+j0qnyQIAjOhCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T18:41:53.730123Z","bundle_sha256":"fe46e32cc67ddfbb7886891dc28e0977a841b4b5ff028680a2abd134e5f39f6b"}}