{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:ERVNIHMWGQYJWWAJUDKIGAQNNP","short_pith_number":"pith:ERVNIHMW","canonical_record":{"source":{"id":"1107.0728","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-04T20:00:26Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"58d38f7c14e20dc60dee00467eacc89ff46c4d08e7c9db630fe909039f4a2a12","abstract_canon_sha256":"545e8374da7a93ce0f536857850ed0ad3d8e237f1c5482067e299b7e32f447b6"},"schema_version":"1.0"},"canonical_sha256":"246ad41d9634309b5809a0d483020d6be273f722eefb0562a98aa8f316a9bea6","source":{"kind":"arxiv","id":"1107.0728","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.0728","created_at":"2026-05-18T02:01:24Z"},{"alias_kind":"arxiv_version","alias_value":"1107.0728v1","created_at":"2026-05-18T02:01:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.0728","created_at":"2026-05-18T02:01:24Z"},{"alias_kind":"pith_short_12","alias_value":"ERVNIHMWGQYJ","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"ERVNIHMWGQYJWWAJ","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"ERVNIHMW","created_at":"2026-05-18T12:26:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:ERVNIHMWGQYJWWAJUDKIGAQNNP","target":"record","payload":{"canonical_record":{"source":{"id":"1107.0728","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-04T20:00:26Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"58d38f7c14e20dc60dee00467eacc89ff46c4d08e7c9db630fe909039f4a2a12","abstract_canon_sha256":"545e8374da7a93ce0f536857850ed0ad3d8e237f1c5482067e299b7e32f447b6"},"schema_version":"1.0"},"canonical_sha256":"246ad41d9634309b5809a0d483020d6be273f722eefb0562a98aa8f316a9bea6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:24.932913Z","signature_b64":"D4H83x4TSu9TIHG8/BBCR9H5sdyhUbeV3f+4EBjvjSc9TOcDWr/NImOJZRFYASefFAxYLr/g7PUTJ+8TGrfGBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"246ad41d9634309b5809a0d483020d6be273f722eefb0562a98aa8f316a9bea6","last_reissued_at":"2026-05-18T02:01:24.932496Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:24.932496Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.0728","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":"2026-05-18T02:01:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KvIclhj+TS5AE38tZWbMqK7FWRkCWhj8Y583WRxNG7W52EKrC2HdoEQmCDv1CE13zLj83oK4rvAjnDXEFEaSDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T01:01:56.158898Z"},"content_sha256":"48c57a757ca2d2b86a1859364b3f0b1ff2febdc6f830614349f63b5e9008cf8c","schema_version":"1.0","event_id":"sha256:48c57a757ca2d2b86a1859364b3f0b1ff2febdc6f830614349f63b5e9008cf8c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:ERVNIHMWGQYJWWAJUDKIGAQNNP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fragment Production and Survival in Irradiated Disks: A Comprehensive Cooling Criterion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"Kaitlin M. Kratter (CfA), Ruth A. Murray-Clay (CfA)","submitted_at":"2011-07-04T20:00:26Z","abstract_excerpt":"Accretion disks that become gravitationally unstable can fragment into stellar or sub-stellar companions. The formation and survival of these fragments depends on the precarious balance between self-gravity, internal pressure, tidal shearing, and rotation. Disk fragmentation depends on two key factors (1) whether the disk can get to the fragmentation boundary of Q=1, and (2) whether fragments can survive for many orbital periods. Previous work suggests that to reach Q=1, and have fragments survive, a disk must cool on an orbital timescale. Here we show that disks heated primarily by external i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.0728","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":"2026-05-18T02:01:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dz6RSWytT3OsFihHTpkwU7jnOzbptQrry3LRcW0I8mtixyC6o5aORjU1HkPJDRKZXZ1Wiy40RtH/00A0E9NjCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T01:01:56.159254Z"},"content_sha256":"44c9751d634fd3f487e73a033d264acfab28466977e8b5f8b0949df15c8327e0","schema_version":"1.0","event_id":"sha256:44c9751d634fd3f487e73a033d264acfab28466977e8b5f8b0949df15c8327e0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ERVNIHMWGQYJWWAJUDKIGAQNNP/bundle.json","state_url":"https://pith.science/pith/ERVNIHMWGQYJWWAJUDKIGAQNNP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ERVNIHMWGQYJWWAJUDKIGAQNNP/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":"2026-06-03T01:01:56Z","links":{"resolver":"https://pith.science/pith/ERVNIHMWGQYJWWAJUDKIGAQNNP","bundle":"https://pith.science/pith/ERVNIHMWGQYJWWAJUDKIGAQNNP/bundle.json","state":"https://pith.science/pith/ERVNIHMWGQYJWWAJUDKIGAQNNP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ERVNIHMWGQYJWWAJUDKIGAQNNP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:ERVNIHMWGQYJWWAJUDKIGAQNNP","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":"545e8374da7a93ce0f536857850ed0ad3d8e237f1c5482067e299b7e32f447b6","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-04T20:00:26Z","title_canon_sha256":"58d38f7c14e20dc60dee00467eacc89ff46c4d08e7c9db630fe909039f4a2a12"},"schema_version":"1.0","source":{"id":"1107.0728","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.0728","created_at":"2026-05-18T02:01:24Z"},{"alias_kind":"arxiv_version","alias_value":"1107.0728v1","created_at":"2026-05-18T02:01:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.0728","created_at":"2026-05-18T02:01:24Z"},{"alias_kind":"pith_short_12","alias_value":"ERVNIHMWGQYJ","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"ERVNIHMWGQYJWWAJ","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"ERVNIHMW","created_at":"2026-05-18T12:26:28Z"}],"graph_snapshots":[{"event_id":"sha256:44c9751d634fd3f487e73a033d264acfab28466977e8b5f8b0949df15c8327e0","target":"graph","created_at":"2026-05-18T02:01:24Z","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":"Accretion disks that become gravitationally unstable can fragment into stellar or sub-stellar companions. The formation and survival of these fragments depends on the precarious balance between self-gravity, internal pressure, tidal shearing, and rotation. Disk fragmentation depends on two key factors (1) whether the disk can get to the fragmentation boundary of Q=1, and (2) whether fragments can survive for many orbital periods. Previous work suggests that to reach Q=1, and have fragments survive, a disk must cool on an orbital timescale. Here we show that disks heated primarily by external i","authors_text":"Kaitlin M. Kratter (CfA), Ruth A. Murray-Clay (CfA)","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-04T20:00:26Z","title":"Fragment Production and Survival in Irradiated Disks: A Comprehensive Cooling Criterion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.0728","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":"sha256:48c57a757ca2d2b86a1859364b3f0b1ff2febdc6f830614349f63b5e9008cf8c","target":"record","created_at":"2026-05-18T02:01:24Z","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":"545e8374da7a93ce0f536857850ed0ad3d8e237f1c5482067e299b7e32f447b6","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-04T20:00:26Z","title_canon_sha256":"58d38f7c14e20dc60dee00467eacc89ff46c4d08e7c9db630fe909039f4a2a12"},"schema_version":"1.0","source":{"id":"1107.0728","kind":"arxiv","version":1}},"canonical_sha256":"246ad41d9634309b5809a0d483020d6be273f722eefb0562a98aa8f316a9bea6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"246ad41d9634309b5809a0d483020d6be273f722eefb0562a98aa8f316a9bea6","first_computed_at":"2026-05-18T02:01:24.932496Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:24.932496Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"D4H83x4TSu9TIHG8/BBCR9H5sdyhUbeV3f+4EBjvjSc9TOcDWr/NImOJZRFYASefFAxYLr/g7PUTJ+8TGrfGBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:24.932913Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.0728","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:48c57a757ca2d2b86a1859364b3f0b1ff2febdc6f830614349f63b5e9008cf8c","sha256:44c9751d634fd3f487e73a033d264acfab28466977e8b5f8b0949df15c8327e0"],"state_sha256":"de5631541b0d72f108e255dc97ff3e06f7c8170ccd2dbcea5adf138b46be066e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d4/aV8XecivyWETOwb8RsMTu8vjSXuwMBG6Nl6Wr7tB46qolOTWHfvi93WOCtbf4lwShiIvWTJgJbFA0ruOoAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T01:01:56.161340Z","bundle_sha256":"40807e0e5122bf593937df72be976a3dda9ea904b0f3dea1f9f46ccc2eb02161"}}