{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:IHYEQAQBEJIDU7EKVSLTX23IGS","short_pith_number":"pith:IHYEQAQB","canonical_record":{"source":{"id":"1807.11555","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-30T20:14:41Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"120ed36128e2d5023c267b4ce68188d46b46ea445eccfe3a5745cc582969fbef","abstract_canon_sha256":"2d9f6614ec4c4edd1c094f6d76b89db9e8ed5d21037e391b73833e90becaac07"},"schema_version":"1.0"},"canonical_sha256":"41f048020122503a7c8aac973beb68349484bc5fe4c57e1f4ab2d0365551c39f","source":{"kind":"arxiv","id":"1807.11555","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.11555","created_at":"2026-05-18T00:09:21Z"},{"alias_kind":"arxiv_version","alias_value":"1807.11555v1","created_at":"2026-05-18T00:09:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.11555","created_at":"2026-05-18T00:09:21Z"},{"alias_kind":"pith_short_12","alias_value":"IHYEQAQBEJID","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"IHYEQAQBEJIDU7EK","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"IHYEQAQB","created_at":"2026-05-18T12:32:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:IHYEQAQBEJIDU7EKVSLTX23IGS","target":"record","payload":{"canonical_record":{"source":{"id":"1807.11555","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-30T20:14:41Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"120ed36128e2d5023c267b4ce68188d46b46ea445eccfe3a5745cc582969fbef","abstract_canon_sha256":"2d9f6614ec4c4edd1c094f6d76b89db9e8ed5d21037e391b73833e90becaac07"},"schema_version":"1.0"},"canonical_sha256":"41f048020122503a7c8aac973beb68349484bc5fe4c57e1f4ab2d0365551c39f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:09:21.902277Z","signature_b64":"bfSpH8kj/Tyq6SZfov7ZTqV7qGy3di/IbZo4jsqQaWgkqLbi2jbpZRtm5r9A5acJRp7nVtxSLzWKCjOGmN7aAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"41f048020122503a7c8aac973beb68349484bc5fe4c57e1f4ab2d0365551c39f","last_reissued_at":"2026-05-18T00:09:21.901796Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:09:21.901796Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.11555","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":"2026-05-18T00:09:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TPs6G0unMLZK/9iZjDt3eNL6JLkQeLValeU0TC9EQclmStVgRqIZeoND5DddAVNOCRS9p/3zMj9SYrS208AFBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T05:00:10.603157Z"},"content_sha256":"94b1c03cbf12400718a4210412cf80b10ee6022f8df429d0a80c5c57249a43b8","schema_version":"1.0","event_id":"sha256:94b1c03cbf12400718a4210412cf80b10ee6022f8df429d0a80c5c57249a43b8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:IHYEQAQBEJIDU7EKVSLTX23IGS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Planet Formation Imager: Project Update","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.IM","authors_text":"John D. Monnier (U. Michigan), Michael J. Ireland (Australian National University), Stefan Kraus (U. Exeter), Technical Working Groups, the PFI Science","submitted_at":"2018-07-30T20:14:41Z","abstract_excerpt":"The Planet Formation Imager (PFI) is a near- and mid-infrared interferometer project with the driving science goal of imaging directly the key stages of planet formation, including the young proto-planets themselves. Here, we will present an update on the work of the Science Working Group (SWG), including new simulations of dust structures during the assembly phase of planet formation and quantitative detection efficiencies for accreting and non-accreting young exoplanets as a function of mass and age. We use these results to motivate two reference PFI designs consisting of a) twelve 3m telesc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.11555","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":"2026-05-18T00:09:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"76UORdYzIEi6ycm6e2576E8Ah7XNWaK9aVUXn7jk5pQsoOOFd75Lj1lrRsRDk16EETFXlI/VWi+2GOUy58RbDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T05:00:10.603887Z"},"content_sha256":"47a963b89335ee61b5592a0145302c8188e70c14c3d46b73f32e477194efd407","schema_version":"1.0","event_id":"sha256:47a963b89335ee61b5592a0145302c8188e70c14c3d46b73f32e477194efd407"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IHYEQAQBEJIDU7EKVSLTX23IGS/bundle.json","state_url":"https://pith.science/pith/IHYEQAQBEJIDU7EKVSLTX23IGS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IHYEQAQBEJIDU7EKVSLTX23IGS/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":"2026-06-08T05:00:10Z","links":{"resolver":"https://pith.science/pith/IHYEQAQBEJIDU7EKVSLTX23IGS","bundle":"https://pith.science/pith/IHYEQAQBEJIDU7EKVSLTX23IGS/bundle.json","state":"https://pith.science/pith/IHYEQAQBEJIDU7EKVSLTX23IGS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IHYEQAQBEJIDU7EKVSLTX23IGS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:IHYEQAQBEJIDU7EKVSLTX23IGS","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":"2d9f6614ec4c4edd1c094f6d76b89db9e8ed5d21037e391b73833e90becaac07","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-30T20:14:41Z","title_canon_sha256":"120ed36128e2d5023c267b4ce68188d46b46ea445eccfe3a5745cc582969fbef"},"schema_version":"1.0","source":{"id":"1807.11555","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.11555","created_at":"2026-05-18T00:09:21Z"},{"alias_kind":"arxiv_version","alias_value":"1807.11555v1","created_at":"2026-05-18T00:09:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.11555","created_at":"2026-05-18T00:09:21Z"},{"alias_kind":"pith_short_12","alias_value":"IHYEQAQBEJID","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"IHYEQAQBEJIDU7EK","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"IHYEQAQB","created_at":"2026-05-18T12:32:31Z"}],"graph_snapshots":[{"event_id":"sha256:47a963b89335ee61b5592a0145302c8188e70c14c3d46b73f32e477194efd407","target":"graph","created_at":"2026-05-18T00:09:21Z","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 Planet Formation Imager (PFI) is a near- and mid-infrared interferometer project with the driving science goal of imaging directly the key stages of planet formation, including the young proto-planets themselves. Here, we will present an update on the work of the Science Working Group (SWG), including new simulations of dust structures during the assembly phase of planet formation and quantitative detection efficiencies for accreting and non-accreting young exoplanets as a function of mass and age. We use these results to motivate two reference PFI designs consisting of a) twelve 3m telesc","authors_text":"John D. Monnier (U. Michigan), Michael J. Ireland (Australian National University), Stefan Kraus (U. Exeter), Technical Working Groups, the PFI Science","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-30T20:14:41Z","title":"Planet Formation Imager: Project Update"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.11555","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":"sha256:94b1c03cbf12400718a4210412cf80b10ee6022f8df429d0a80c5c57249a43b8","target":"record","created_at":"2026-05-18T00:09:21Z","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":"2d9f6614ec4c4edd1c094f6d76b89db9e8ed5d21037e391b73833e90becaac07","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-30T20:14:41Z","title_canon_sha256":"120ed36128e2d5023c267b4ce68188d46b46ea445eccfe3a5745cc582969fbef"},"schema_version":"1.0","source":{"id":"1807.11555","kind":"arxiv","version":1}},"canonical_sha256":"41f048020122503a7c8aac973beb68349484bc5fe4c57e1f4ab2d0365551c39f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"41f048020122503a7c8aac973beb68349484bc5fe4c57e1f4ab2d0365551c39f","first_computed_at":"2026-05-18T00:09:21.901796Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:09:21.901796Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bfSpH8kj/Tyq6SZfov7ZTqV7qGy3di/IbZo4jsqQaWgkqLbi2jbpZRtm5r9A5acJRp7nVtxSLzWKCjOGmN7aAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:09:21.902277Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.11555","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:94b1c03cbf12400718a4210412cf80b10ee6022f8df429d0a80c5c57249a43b8","sha256:47a963b89335ee61b5592a0145302c8188e70c14c3d46b73f32e477194efd407"],"state_sha256":"cbea30bc0cd7255aeeb466d9e88e89f27160a860264efdac4782c6812251f81b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hA3XeF9JbYwv+xKFMExzyOU+iX6iroNgjmvZbxtbLAO9EF8Y4pWgqAW1OCfhe3eaQ7CHfTe+t4VkrE4d0uzjAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T05:00:10.607980Z","bundle_sha256":"c6b5c047ddfb912419aacf0e70f1e2c9a821ac7af31e5592ea12e3bb82fc3562"}}