{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:VCRZIR6QDNXGZ6VKPDZHI3LDSC","short_pith_number":"pith:VCRZIR6Q","canonical_record":{"source":{"id":"1803.09893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-27T04:29:17Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"825731b9db2b341158877c50892bdc6cdc12862cf2b8bfa2658fced312890f3c","abstract_canon_sha256":"6118794d7aeb41feebb255506d60b7bbc65efab2b99f83fd7c2b22b9455f542f"},"schema_version":"1.0"},"canonical_sha256":"a8a39447d01b6e6cfaaa78f2746d6390b99157f58954c44025bfa94a53472f8b","source":{"kind":"arxiv","id":"1803.09893","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.09893","created_at":"2026-05-18T00:10:31Z"},{"alias_kind":"arxiv_version","alias_value":"1803.09893v1","created_at":"2026-05-18T00:10:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.09893","created_at":"2026-05-18T00:10:31Z"},{"alias_kind":"pith_short_12","alias_value":"VCRZIR6QDNXG","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"VCRZIR6QDNXGZ6VK","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"VCRZIR6Q","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:VCRZIR6QDNXGZ6VKPDZHI3LDSC","target":"record","payload":{"canonical_record":{"source":{"id":"1803.09893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-27T04:29:17Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"825731b9db2b341158877c50892bdc6cdc12862cf2b8bfa2658fced312890f3c","abstract_canon_sha256":"6118794d7aeb41feebb255506d60b7bbc65efab2b99f83fd7c2b22b9455f542f"},"schema_version":"1.0"},"canonical_sha256":"a8a39447d01b6e6cfaaa78f2746d6390b99157f58954c44025bfa94a53472f8b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:10:31.517397Z","signature_b64":"mKPcfBY+CkrnAlHX6nCUHhQennhf9i4c4awV/qguHjsBWCE94xm+Kr6Cqy4NDnfhCXctB1gc4iZ27k2vhS52DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a8a39447d01b6e6cfaaa78f2746d6390b99157f58954c44025bfa94a53472f8b","last_reissued_at":"2026-05-18T00:10:31.516741Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:10:31.516741Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.09893","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":"2026-05-18T00:10:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t3z84Pda6zeaC5wTu73J+6dX52b60RQR6oQJCswtZ9NvHYk3kh8SF5GWbbCeSfO/Dh8liUKh/TWDGwOHu0k3Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:13:34.803873Z"},"content_sha256":"f0a88a89cad38cc5bc946bd6292b07f79dc13f6cb93408799950a01f56646fd0","schema_version":"1.0","event_id":"sha256:f0a88a89cad38cc5bc946bd6292b07f79dc13f6cb93408799950a01f56646fd0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:VCRZIR6QDNXGZ6VKPDZHI3LDSC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Constraint on ion-neutral drift velocity in the Class 0 protostar B335 from ALMA observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Bo Zhao, Hsi-Wei Yen, Nagayoshi Ohashi, Patrick M. Koch, Ruben Krasnopolsky, Shigehisa Takakuwa, Zhi-Yun Li","submitted_at":"2018-03-27T04:29:17Z","abstract_excerpt":"Ambipolar diffusion can cause a velocity drift between ions and neutrals. This is one of the non-ideal MHD effects proposed to enable the formation of Keplerian disks with sizes of tens of au. To observationally study ambipolar diffusion in collapsing protostellar envelopes, we compare gas kinematics traced by the H13CO+ (3-2) and C18O (2-1) lines in the Class 0 protostar B335 obtained with our ALMA observations. A central compact (~1\"-2\") component that is elongated perpendicular to the outflow direction and exhibits a clear velocity gradient along the outflow direction is observed in both li"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.09893","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":"2026-05-18T00:10:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"spYpQSguQWHi1oicyZ1R3FIqY1rIBhSgTlamDqoizPbJjzyQQ2rJgMLTavbVUi0bfNg/7TEW0kEWm3Ork28EAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:13:34.804786Z"},"content_sha256":"3555080dea4f2e2cb4c2a1e6e89d7d12a0698d238cde132685c236e7b09d60e6","schema_version":"1.0","event_id":"sha256:3555080dea4f2e2cb4c2a1e6e89d7d12a0698d238cde132685c236e7b09d60e6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VCRZIR6QDNXGZ6VKPDZHI3LDSC/bundle.json","state_url":"https://pith.science/pith/VCRZIR6QDNXGZ6VKPDZHI3LDSC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VCRZIR6QDNXGZ6VKPDZHI3LDSC/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":"2026-05-30T11:13:34Z","links":{"resolver":"https://pith.science/pith/VCRZIR6QDNXGZ6VKPDZHI3LDSC","bundle":"https://pith.science/pith/VCRZIR6QDNXGZ6VKPDZHI3LDSC/bundle.json","state":"https://pith.science/pith/VCRZIR6QDNXGZ6VKPDZHI3LDSC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VCRZIR6QDNXGZ6VKPDZHI3LDSC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:VCRZIR6QDNXGZ6VKPDZHI3LDSC","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":"6118794d7aeb41feebb255506d60b7bbc65efab2b99f83fd7c2b22b9455f542f","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-27T04:29:17Z","title_canon_sha256":"825731b9db2b341158877c50892bdc6cdc12862cf2b8bfa2658fced312890f3c"},"schema_version":"1.0","source":{"id":"1803.09893","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.09893","created_at":"2026-05-18T00:10:31Z"},{"alias_kind":"arxiv_version","alias_value":"1803.09893v1","created_at":"2026-05-18T00:10:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.09893","created_at":"2026-05-18T00:10:31Z"},{"alias_kind":"pith_short_12","alias_value":"VCRZIR6QDNXG","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"VCRZIR6QDNXGZ6VK","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"VCRZIR6Q","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:3555080dea4f2e2cb4c2a1e6e89d7d12a0698d238cde132685c236e7b09d60e6","target":"graph","created_at":"2026-05-18T00:10:31Z","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":"Ambipolar diffusion can cause a velocity drift between ions and neutrals. This is one of the non-ideal MHD effects proposed to enable the formation of Keplerian disks with sizes of tens of au. To observationally study ambipolar diffusion in collapsing protostellar envelopes, we compare gas kinematics traced by the H13CO+ (3-2) and C18O (2-1) lines in the Class 0 protostar B335 obtained with our ALMA observations. A central compact (~1\"-2\") component that is elongated perpendicular to the outflow direction and exhibits a clear velocity gradient along the outflow direction is observed in both li","authors_text":"Bo Zhao, Hsi-Wei Yen, Nagayoshi Ohashi, Patrick M. Koch, Ruben Krasnopolsky, Shigehisa Takakuwa, Zhi-Yun Li","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-27T04:29:17Z","title":"Constraint on ion-neutral drift velocity in the Class 0 protostar B335 from ALMA observations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.09893","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:f0a88a89cad38cc5bc946bd6292b07f79dc13f6cb93408799950a01f56646fd0","target":"record","created_at":"2026-05-18T00:10:31Z","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":"6118794d7aeb41feebb255506d60b7bbc65efab2b99f83fd7c2b22b9455f542f","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-03-27T04:29:17Z","title_canon_sha256":"825731b9db2b341158877c50892bdc6cdc12862cf2b8bfa2658fced312890f3c"},"schema_version":"1.0","source":{"id":"1803.09893","kind":"arxiv","version":1}},"canonical_sha256":"a8a39447d01b6e6cfaaa78f2746d6390b99157f58954c44025bfa94a53472f8b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a8a39447d01b6e6cfaaa78f2746d6390b99157f58954c44025bfa94a53472f8b","first_computed_at":"2026-05-18T00:10:31.516741Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:10:31.516741Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mKPcfBY+CkrnAlHX6nCUHhQennhf9i4c4awV/qguHjsBWCE94xm+Kr6Cqy4NDnfhCXctB1gc4iZ27k2vhS52DA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:10:31.517397Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.09893","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f0a88a89cad38cc5bc946bd6292b07f79dc13f6cb93408799950a01f56646fd0","sha256:3555080dea4f2e2cb4c2a1e6e89d7d12a0698d238cde132685c236e7b09d60e6"],"state_sha256":"cc0b0a4fe353a3188190f78aebe894c536425620171a5b42361855ebd6eebfd6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5cN4l3CiNRu0bYo3hClLEBWX/oEh20G5+2UBJ9tXCUWUlPPY8ywZfIEIbHuXk/7B5QGRwF1K1hPSkWikrxIJDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T11:13:34.809116Z","bundle_sha256":"2114eccbab33c6a924b4835991b99bd175e1f6e14bb5bbf3c88bdf6ae19c6155"}}