{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:W26AXQYMCBRAFSIXAECJVPFN2C","short_pith_number":"pith:W26AXQYM","canonical_record":{"source":{"id":"1812.10763","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-27T16:42:22Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"3357cd58bed060f6c243e35a371c8ea2381ccfdd1952defc16d3cdfcea6329f3","abstract_canon_sha256":"8c9b442d54d5280db35759a4895762a0e686358d70c7c5a8881cb6546cc42a00"},"schema_version":"1.0"},"canonical_sha256":"b6bc0bc30c106202c91701049abcadd0b9a8dc3be3abb07c8bbd355a22a496d0","source":{"kind":"arxiv","id":"1812.10763","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.10763","created_at":"2026-05-17T23:57:20Z"},{"alias_kind":"arxiv_version","alias_value":"1812.10763v1","created_at":"2026-05-17T23:57:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.10763","created_at":"2026-05-17T23:57:20Z"},{"alias_kind":"pith_short_12","alias_value":"W26AXQYMCBRA","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"W26AXQYMCBRAFSIX","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"W26AXQYM","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:W26AXQYMCBRAFSIXAECJVPFN2C","target":"record","payload":{"canonical_record":{"source":{"id":"1812.10763","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-27T16:42:22Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"3357cd58bed060f6c243e35a371c8ea2381ccfdd1952defc16d3cdfcea6329f3","abstract_canon_sha256":"8c9b442d54d5280db35759a4895762a0e686358d70c7c5a8881cb6546cc42a00"},"schema_version":"1.0"},"canonical_sha256":"b6bc0bc30c106202c91701049abcadd0b9a8dc3be3abb07c8bbd355a22a496d0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:57:20.057565Z","signature_b64":"8Dft8341rnDjeC0J4CN4cALCfKIpvksIxgjHvdX8A+KK0tF30uXREZ+0BUZV2wdANGByvJPOPOoBf9WiYs6kBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b6bc0bc30c106202c91701049abcadd0b9a8dc3be3abb07c8bbd355a22a496d0","last_reissued_at":"2026-05-17T23:57:20.057081Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:57:20.057081Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1812.10763","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":"2026-05-17T23:57:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Bq6O30uZwWmGNb7YX3p5/VthfXPVqN9PduxzJUMp1thW/433Bc/PL0iDzLCJ2ZJMVOUHY+g0JQf2OnoRODWIAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:05:39.527984Z"},"content_sha256":"93e5bda9bceb97e7581f0598197ff706a69ae877d9876c4c45e5d54c17b747f3","schema_version":"1.0","event_id":"sha256:93e5bda9bceb97e7581f0598197ff706a69ae877d9876c4c45e5d54c17b747f3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:W26AXQYMCBRAFSIXAECJVPFN2C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A 3D Hydrodynamics Study of Gravitational Instabilities in a Young Circumbinary Disc","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"Kai Cai, Karna M. Desai, Richard H. Durisen, Scott Michael, Thomas Y. Steiman-Cameron","submitted_at":"2018-12-27T16:42:22Z","abstract_excerpt":"We present a 3D hydrodynamics study of gravitational instabilities (GIs) in a 0.14 M$_{\\odot}$ circumbinary protoplanetary disc orbiting a 1 M$_{\\odot}$ star and a 0.02 M$_{\\odot}$ brown dwarf companion. We examine the thermodynamical state of the disc and determine the strengths of GI-induced density waves, nonaxisymmetric density structures, mass inflow and outflow, and gravitational torques. Results are compared with a parallel simulation of a protoplanetary disc without the brown dwarf binary companion. Simulations are performed using CHYMERA, a radiative 3D hydrodynamics code. The onset o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.10763","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":"2026-05-17T23:57:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lJavxX1HoAAQfIn0IhqCFEkwgTNPWZFLQlF9JusKwE5BK6Is1hxq27n67Hqlce2GhlDG52grbDX6Iv8GkNPwBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:05:39.528349Z"},"content_sha256":"2bbbff58f12d62b60775820c7a62e0dffb1d2efcb8820ddeb8512d431859fda5","schema_version":"1.0","event_id":"sha256:2bbbff58f12d62b60775820c7a62e0dffb1d2efcb8820ddeb8512d431859fda5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W26AXQYMCBRAFSIXAECJVPFN2C/bundle.json","state_url":"https://pith.science/pith/W26AXQYMCBRAFSIXAECJVPFN2C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W26AXQYMCBRAFSIXAECJVPFN2C/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":"2026-05-30T08:05:39Z","links":{"resolver":"https://pith.science/pith/W26AXQYMCBRAFSIXAECJVPFN2C","bundle":"https://pith.science/pith/W26AXQYMCBRAFSIXAECJVPFN2C/bundle.json","state":"https://pith.science/pith/W26AXQYMCBRAFSIXAECJVPFN2C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W26AXQYMCBRAFSIXAECJVPFN2C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:W26AXQYMCBRAFSIXAECJVPFN2C","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":"8c9b442d54d5280db35759a4895762a0e686358d70c7c5a8881cb6546cc42a00","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-27T16:42:22Z","title_canon_sha256":"3357cd58bed060f6c243e35a371c8ea2381ccfdd1952defc16d3cdfcea6329f3"},"schema_version":"1.0","source":{"id":"1812.10763","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.10763","created_at":"2026-05-17T23:57:20Z"},{"alias_kind":"arxiv_version","alias_value":"1812.10763v1","created_at":"2026-05-17T23:57:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.10763","created_at":"2026-05-17T23:57:20Z"},{"alias_kind":"pith_short_12","alias_value":"W26AXQYMCBRA","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"W26AXQYMCBRAFSIX","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"W26AXQYM","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:2bbbff58f12d62b60775820c7a62e0dffb1d2efcb8820ddeb8512d431859fda5","target":"graph","created_at":"2026-05-17T23:57:20Z","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 3D hydrodynamics study of gravitational instabilities (GIs) in a 0.14 M$_{\\odot}$ circumbinary protoplanetary disc orbiting a 1 M$_{\\odot}$ star and a 0.02 M$_{\\odot}$ brown dwarf companion. We examine the thermodynamical state of the disc and determine the strengths of GI-induced density waves, nonaxisymmetric density structures, mass inflow and outflow, and gravitational torques. Results are compared with a parallel simulation of a protoplanetary disc without the brown dwarf binary companion. Simulations are performed using CHYMERA, a radiative 3D hydrodynamics code. The onset o","authors_text":"Kai Cai, Karna M. Desai, Richard H. Durisen, Scott Michael, Thomas Y. Steiman-Cameron","cross_cats":["astro-ph.EP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-27T16:42:22Z","title":"A 3D Hydrodynamics Study of Gravitational Instabilities in a Young Circumbinary Disc"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.10763","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":"sha256:93e5bda9bceb97e7581f0598197ff706a69ae877d9876c4c45e5d54c17b747f3","target":"record","created_at":"2026-05-17T23:57:20Z","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":"8c9b442d54d5280db35759a4895762a0e686358d70c7c5a8881cb6546cc42a00","cross_cats_sorted":["astro-ph.EP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-12-27T16:42:22Z","title_canon_sha256":"3357cd58bed060f6c243e35a371c8ea2381ccfdd1952defc16d3cdfcea6329f3"},"schema_version":"1.0","source":{"id":"1812.10763","kind":"arxiv","version":1}},"canonical_sha256":"b6bc0bc30c106202c91701049abcadd0b9a8dc3be3abb07c8bbd355a22a496d0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6bc0bc30c106202c91701049abcadd0b9a8dc3be3abb07c8bbd355a22a496d0","first_computed_at":"2026-05-17T23:57:20.057081Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:57:20.057081Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8Dft8341rnDjeC0J4CN4cALCfKIpvksIxgjHvdX8A+KK0tF30uXREZ+0BUZV2wdANGByvJPOPOoBf9WiYs6kBQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:57:20.057565Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.10763","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93e5bda9bceb97e7581f0598197ff706a69ae877d9876c4c45e5d54c17b747f3","sha256:2bbbff58f12d62b60775820c7a62e0dffb1d2efcb8820ddeb8512d431859fda5"],"state_sha256":"8954cb8f043e772ea1b5adba886adf6584313cfbf356c591018ef64c3843e85a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"89Cpk6+SdwjzQnR0kEBlii0X3WfMu3DrewuJJgaUVRRCiB3n+99QN0eSXoxuIPKhCC45QryRcyVq2hv1xduqBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T08:05:39.530467Z","bundle_sha256":"cda38ecd3f9dcbda160d95976478e0eeb7cb057dcb35d0ce3e3ae7935607ff37"}}