{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:YRH6LYLOYUY2DVZTGU7Z6FO6CZ","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":"659ee690889c558ba0303a6e149b78da15c9f51a9e20f52c1bca245e3c6d0f48","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-03-26T01:25:54Z","title_canon_sha256":"043770aa1574f03aaa93b599e985a4f4a107755575d74742e1e65fc9260558c2"},"schema_version":"1.0","source":{"id":"1403.6552","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1403.6552","created_at":"2026-05-18T01:43:51Z"},{"alias_kind":"arxiv_version","alias_value":"1403.6552v1","created_at":"2026-05-18T01:43:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1403.6552","created_at":"2026-05-18T01:43:51Z"},{"alias_kind":"pith_short_12","alias_value":"YRH6LYLOYUY2","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"YRH6LYLOYUY2DVZT","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"YRH6LYLO","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:3b822c358da1058e0c0042b16269c78b44e6afabc5d326dc9ed8f449d28922b1","target":"graph","created_at":"2026-05-18T01:43:51Z","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 examine the consequences of a model for the circulation of solids in a protoplanetary nebula in which aerodynamic drag is counterbalanced by the recycling of material to the outer disc by a protostellar outflow or a disc wind. This population of circulating dust eventually becomes unstable to the formation of planetesimals by gravitational instability, and results in the ultimate deposition of 30--50 earth masses in planetesimals on scales R< 1 AU. Such a model may provide an appropriate justification for the approximately power law initial conditions needed to reproduce observed planetary ","authors_text":"Bradley M. S. Hansen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-03-26T01:25:54Z","title":"The circulation of dust in protoplanetary discs and the initial conditions of planet formation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.6552","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:cade558dac6e6acaa674360c87d4e4fcf2466275ca8bbe0fff069dd87eafd4a3","target":"record","created_at":"2026-05-18T01:43:51Z","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":"659ee690889c558ba0303a6e149b78da15c9f51a9e20f52c1bca245e3c6d0f48","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-03-26T01:25:54Z","title_canon_sha256":"043770aa1574f03aaa93b599e985a4f4a107755575d74742e1e65fc9260558c2"},"schema_version":"1.0","source":{"id":"1403.6552","kind":"arxiv","version":1}},"canonical_sha256":"c44fe5e16ec531a1d733353f9f15de164becee36cb43effbda0c0dedfd3ace92","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c44fe5e16ec531a1d733353f9f15de164becee36cb43effbda0c0dedfd3ace92","first_computed_at":"2026-05-18T01:43:51.105290Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:43:51.105290Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ovAbZM2SzG6QNUJ1bOD3wwTfo+3npb6ohqyOZ88UkH/NLWKda8qwrG4lutUYJ18AZTo2pSJY7i32tZEjXt8YAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:43:51.106101Z","signed_message":"canonical_sha256_bytes"},"source_id":"1403.6552","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cade558dac6e6acaa674360c87d4e4fcf2466275ca8bbe0fff069dd87eafd4a3","sha256:3b822c358da1058e0c0042b16269c78b44e6afabc5d326dc9ed8f449d28922b1"],"state_sha256":"758d7c328902338970c03efab482cbd89e69ccb62d2f532c391a4437495251af"}