{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:CC2ZSYMSRZISDRH3M5PEDAZZGU","short_pith_number":"pith:CC2ZSYMS","canonical_record":{"source":{"id":"1408.3000","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-13T13:14:49Z","cross_cats_sorted":[],"title_canon_sha256":"dc96dc43cadba73087592e5eeb5c247a7b508fc5562db0c3a93b82b1f05318c7","abstract_canon_sha256":"7add4ec552a3c65c32bd7132ef0831be358ac597541b62256640a3c3a5da7a3e"},"schema_version":"1.0"},"canonical_sha256":"10b59961928e5121c4fb675e4183393509fa13c72a57390d768db90f89c0586b","source":{"kind":"arxiv","id":"1408.3000","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.3000","created_at":"2026-05-18T02:39:38Z"},{"alias_kind":"arxiv_version","alias_value":"1408.3000v2","created_at":"2026-05-18T02:39:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.3000","created_at":"2026-05-18T02:39:38Z"},{"alias_kind":"pith_short_12","alias_value":"CC2ZSYMSRZIS","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"CC2ZSYMSRZISDRH3","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"CC2ZSYMS","created_at":"2026-05-18T12:28:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:CC2ZSYMSRZISDRH3M5PEDAZZGU","target":"record","payload":{"canonical_record":{"source":{"id":"1408.3000","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-13T13:14:49Z","cross_cats_sorted":[],"title_canon_sha256":"dc96dc43cadba73087592e5eeb5c247a7b508fc5562db0c3a93b82b1f05318c7","abstract_canon_sha256":"7add4ec552a3c65c32bd7132ef0831be358ac597541b62256640a3c3a5da7a3e"},"schema_version":"1.0"},"canonical_sha256":"10b59961928e5121c4fb675e4183393509fa13c72a57390d768db90f89c0586b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:39:38.643824Z","signature_b64":"42ofMxuavf728ylusR6S4988gytsIMoQVOKPObXEjqh7TYutjTLFTw5P1T0xG5Rd1TCh11TnzM9lEyq6cLyrCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"10b59961928e5121c4fb675e4183393509fa13c72a57390d768db90f89c0586b","last_reissued_at":"2026-05-18T02:39:38.643390Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:39:38.643390Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1408.3000","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:39:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Dmu55RjsQ6KfEZt2TBLuD6FdOVblw8F3Hjc88yNxKH+wHKwLj+14pZbFn4c5k4BS8dVpGHTEl5QmNZjBg/6hBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T18:54:59.626767Z"},"content_sha256":"739ee9b3d14e1e1b07123bd6d36f7639017ba022d0dd446a0a56a81288f5c014","schema_version":"1.0","event_id":"sha256:739ee9b3d14e1e1b07123bd6d36f7639017ba022d0dd446a0a56a81288f5c014"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:CC2ZSYMSRZISDRH3M5PEDAZZGU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Weak magnetic fields in central stars of planetary nebulae?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"(2) Universit\\\"at Potsdam, (3) European Southern Observatory, C. Sandin (1), D. Sch\\\"onberner (1) ((1) Leibniz-Institut f\\\"ur Astrophysik Potsdam, Garching, Germany, Germany), H. Todt (2), Institut f\\\"ur Physik und Astronomie, M. Sch\\\"oller (3), M. Steffen (1), S. Hubrig (1), W.-R. Hamann (2)","submitted_at":"2014-08-13T13:14:49Z","abstract_excerpt":"It is not yet clear whether magnetic fields play an essential role in shaping planetary nebulae (PNe), or whether stellar rotation alone and/or a close binary companion can account for the variety of the observed nebular morphologies. In a quest for empirical evidence verifying or disproving the role of magnetic fields in shaping PNe, we follow up on previous attempts to measure the magnetic field in a representative sample of PN central stars. We obtained low-resolution polarimetric spectra with FORS 2 at VLT for a sample of twelve bright central stars of PNe with different morphology, includ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.3000","kind":"arxiv","version":2},"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":"2026-05-18T02:39:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bF1KzBOKQvOcmVN5yI+nYReIS+cXGxrtyo5ols/QxV6STQHxeCOUjyVz66PjFMjKd3a9fy/ibZw3hzh3D1BxBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T18:54:59.627457Z"},"content_sha256":"eb5078b805a4782a1beb1e54258a3fad78b8b33fe9c4b6a985abd33f12ee0187","schema_version":"1.0","event_id":"sha256:eb5078b805a4782a1beb1e54258a3fad78b8b33fe9c4b6a985abd33f12ee0187"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CC2ZSYMSRZISDRH3M5PEDAZZGU/bundle.json","state_url":"https://pith.science/pith/CC2ZSYMSRZISDRH3M5PEDAZZGU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CC2ZSYMSRZISDRH3M5PEDAZZGU/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":"2026-05-26T18:54:59Z","links":{"resolver":"https://pith.science/pith/CC2ZSYMSRZISDRH3M5PEDAZZGU","bundle":"https://pith.science/pith/CC2ZSYMSRZISDRH3M5PEDAZZGU/bundle.json","state":"https://pith.science/pith/CC2ZSYMSRZISDRH3M5PEDAZZGU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CC2ZSYMSRZISDRH3M5PEDAZZGU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:CC2ZSYMSRZISDRH3M5PEDAZZGU","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":"7add4ec552a3c65c32bd7132ef0831be358ac597541b62256640a3c3a5da7a3e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-13T13:14:49Z","title_canon_sha256":"dc96dc43cadba73087592e5eeb5c247a7b508fc5562db0c3a93b82b1f05318c7"},"schema_version":"1.0","source":{"id":"1408.3000","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.3000","created_at":"2026-05-18T02:39:38Z"},{"alias_kind":"arxiv_version","alias_value":"1408.3000v2","created_at":"2026-05-18T02:39:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.3000","created_at":"2026-05-18T02:39:38Z"},{"alias_kind":"pith_short_12","alias_value":"CC2ZSYMSRZIS","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"CC2ZSYMSRZISDRH3","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"CC2ZSYMS","created_at":"2026-05-18T12:28:22Z"}],"graph_snapshots":[{"event_id":"sha256:eb5078b805a4782a1beb1e54258a3fad78b8b33fe9c4b6a985abd33f12ee0187","target":"graph","created_at":"2026-05-18T02:39:38Z","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":"It is not yet clear whether magnetic fields play an essential role in shaping planetary nebulae (PNe), or whether stellar rotation alone and/or a close binary companion can account for the variety of the observed nebular morphologies. In a quest for empirical evidence verifying or disproving the role of magnetic fields in shaping PNe, we follow up on previous attempts to measure the magnetic field in a representative sample of PN central stars. We obtained low-resolution polarimetric spectra with FORS 2 at VLT for a sample of twelve bright central stars of PNe with different morphology, includ","authors_text":"(2) Universit\\\"at Potsdam, (3) European Southern Observatory, C. Sandin (1), D. Sch\\\"onberner (1) ((1) Leibniz-Institut f\\\"ur Astrophysik Potsdam, Garching, Germany, Germany), H. Todt (2), Institut f\\\"ur Physik und Astronomie, M. Sch\\\"oller (3), M. Steffen (1), S. Hubrig (1), W.-R. Hamann (2)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-13T13:14:49Z","title":"Weak magnetic fields in central stars of planetary nebulae?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.3000","kind":"arxiv","version":2},"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":"sha256:739ee9b3d14e1e1b07123bd6d36f7639017ba022d0dd446a0a56a81288f5c014","target":"record","created_at":"2026-05-18T02:39:38Z","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":"7add4ec552a3c65c32bd7132ef0831be358ac597541b62256640a3c3a5da7a3e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-13T13:14:49Z","title_canon_sha256":"dc96dc43cadba73087592e5eeb5c247a7b508fc5562db0c3a93b82b1f05318c7"},"schema_version":"1.0","source":{"id":"1408.3000","kind":"arxiv","version":2}},"canonical_sha256":"10b59961928e5121c4fb675e4183393509fa13c72a57390d768db90f89c0586b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"10b59961928e5121c4fb675e4183393509fa13c72a57390d768db90f89c0586b","first_computed_at":"2026-05-18T02:39:38.643390Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:39:38.643390Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"42ofMxuavf728ylusR6S4988gytsIMoQVOKPObXEjqh7TYutjTLFTw5P1T0xG5Rd1TCh11TnzM9lEyq6cLyrCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:39:38.643824Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.3000","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:739ee9b3d14e1e1b07123bd6d36f7639017ba022d0dd446a0a56a81288f5c014","sha256:eb5078b805a4782a1beb1e54258a3fad78b8b33fe9c4b6a985abd33f12ee0187"],"state_sha256":"ea943ce7c77b4b9c5c19c506d95611fe20481f88bcee0c02ceb8e65709b43713"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dIYEU/neNHZtx7bASWmdXy0SAbAKGxvnWoL+BuMAUSQWv/1GnnfRnwYp7Y3M8xDjdHW4cRMylndYcvYyn5ueAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T18:54:59.630948Z","bundle_sha256":"c3c5cdf4372f2e64b0f7524e36c4c3afef46fc8320932161ea930b5766dd33e7"}}