{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:3AB2N4SBE3L273Z2UDRHS7UXNN","short_pith_number":"pith:3AB2N4SB","canonical_record":{"source":{"id":"astro-ph/9807021","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-07-02T09:49:52Z","cross_cats_sorted":[],"title_canon_sha256":"b326ba9b1c2e9ff2afd27743349135b7b500d591cf59ad511c8550970e4bc2f5","abstract_canon_sha256":"aa5fe598d2a398212b8ea58182bc97830cc850ed07d238f09b8212b8cff3a94d"},"schema_version":"1.0"},"canonical_sha256":"d803a6f24126d7afef3aa0e2797e976b482b3dd11d9df570b8ca80a6f83cf305","source":{"kind":"arxiv","id":"astro-ph/9807021","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9807021","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9807021v1","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9807021","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"pith_short_12","alias_value":"3AB2N4SBE3L2","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"pith_short_16","alias_value":"3AB2N4SBE3L273Z2","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"pith_short_8","alias_value":"3AB2N4SB","created_at":"2026-07-04T16:06:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:3AB2N4SBE3L273Z2UDRHS7UXNN","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9807021","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-07-02T09:49:52Z","cross_cats_sorted":[],"title_canon_sha256":"b326ba9b1c2e9ff2afd27743349135b7b500d591cf59ad511c8550970e4bc2f5","abstract_canon_sha256":"aa5fe598d2a398212b8ea58182bc97830cc850ed07d238f09b8212b8cff3a94d"},"schema_version":"1.0"},"canonical_sha256":"d803a6f24126d7afef3aa0e2797e976b482b3dd11d9df570b8ca80a6f83cf305","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:06:49.795449Z","signature_b64":"ng2yXj02245wBTt2QNhRNgoh65i114eDTaHekXvCsyvMQMXI/nkgsUdeHZKSvEHihnDrV6qpihx+TG0CSlvECQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d803a6f24126d7afef3aa0e2797e976b482b3dd11d9df570b8ca80a6f83cf305","last_reissued_at":"2026-07-04T16:06:49.794967Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:06:49.794967Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9807021","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":"2026-07-04T16:06:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C8kyMQQye/bbzQY20XJz16uokS4ctjFfVo2l2Ejd01PL54jZz3VvihEWJk1V1O41wg56xpevtBx/0aLC60NjAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T18:08:41.418493Z"},"content_sha256":"fc867e35fcff70fd098339a0fba2b56c311dd5d7799119be7aa389993a63d182","schema_version":"1.0","event_id":"sha256:fc867e35fcff70fd098339a0fba2b56c311dd5d7799119be7aa389993a63d182"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:3AB2N4SBE3L273Z2UDRHS7UXNN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Jets and the shaping of the giant bipolar envelope of the planetary nebula KjPn 8","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Lopez, W. Steffen","submitted_at":"1998-07-02T09:49:52Z","abstract_excerpt":"A hydrodynamic model involving cooling gas in the stagnation region of a collimated outflow is proposed for the formation of the giant parsec-scale bipolar envelope that surrounds the planetary nebula KjPn 8. Analytical calculations and numerical simulations are presented to evaluate the model. The envelope is considered to consist mainly of environmental gas swept-up by shocks driven by an episodic, collimated, bipolar outflow. In this model, which we call the ``free stagnation knot'' mechanism, the swept-up ambient gas located in the stagnation region of the bow-shock cools to produce a high"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9807021","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9807021/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T16:06:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4YvX04o9DDKe0gwV6vbEymSRPWNctWUol4a6H/eabLMg7lHqzb0vLLPVOlSZWIg/tAsTxzBFfQMDMXUuaubnDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T18:08:41.418907Z"},"content_sha256":"c05915fb566b5bedd9b2f1601bf14d39ae9ef3e2f217adf10fa24a7df4a34821","schema_version":"1.0","event_id":"sha256:c05915fb566b5bedd9b2f1601bf14d39ae9ef3e2f217adf10fa24a7df4a34821"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3AB2N4SBE3L273Z2UDRHS7UXNN/bundle.json","state_url":"https://pith.science/pith/3AB2N4SBE3L273Z2UDRHS7UXNN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3AB2N4SBE3L273Z2UDRHS7UXNN/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":"2026-07-06T18:08:41Z","links":{"resolver":"https://pith.science/pith/3AB2N4SBE3L273Z2UDRHS7UXNN","bundle":"https://pith.science/pith/3AB2N4SBE3L273Z2UDRHS7UXNN/bundle.json","state":"https://pith.science/pith/3AB2N4SBE3L273Z2UDRHS7UXNN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3AB2N4SBE3L273Z2UDRHS7UXNN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:3AB2N4SBE3L273Z2UDRHS7UXNN","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":"aa5fe598d2a398212b8ea58182bc97830cc850ed07d238f09b8212b8cff3a94d","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-07-02T09:49:52Z","title_canon_sha256":"b326ba9b1c2e9ff2afd27743349135b7b500d591cf59ad511c8550970e4bc2f5"},"schema_version":"1.0","source":{"id":"astro-ph/9807021","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9807021","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9807021v1","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9807021","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"pith_short_12","alias_value":"3AB2N4SBE3L2","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"pith_short_16","alias_value":"3AB2N4SBE3L273Z2","created_at":"2026-07-04T16:06:49Z"},{"alias_kind":"pith_short_8","alias_value":"3AB2N4SB","created_at":"2026-07-04T16:06:49Z"}],"graph_snapshots":[{"event_id":"sha256:c05915fb566b5bedd9b2f1601bf14d39ae9ef3e2f217adf10fa24a7df4a34821","target":"graph","created_at":"2026-07-04T16:06:49Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/9807021/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A hydrodynamic model involving cooling gas in the stagnation region of a collimated outflow is proposed for the formation of the giant parsec-scale bipolar envelope that surrounds the planetary nebula KjPn 8. Analytical calculations and numerical simulations are presented to evaluate the model. The envelope is considered to consist mainly of environmental gas swept-up by shocks driven by an episodic, collimated, bipolar outflow. In this model, which we call the ``free stagnation knot'' mechanism, the swept-up ambient gas located in the stagnation region of the bow-shock cools to produce a high","authors_text":"A. Lopez, W. Steffen","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1998-07-02T09:49:52Z","title":"Jets and the shaping of the giant bipolar envelope of the planetary nebula KjPn 8"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9807021","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:fc867e35fcff70fd098339a0fba2b56c311dd5d7799119be7aa389993a63d182","target":"record","created_at":"2026-07-04T16:06:49Z","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":"aa5fe598d2a398212b8ea58182bc97830cc850ed07d238f09b8212b8cff3a94d","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-07-02T09:49:52Z","title_canon_sha256":"b326ba9b1c2e9ff2afd27743349135b7b500d591cf59ad511c8550970e4bc2f5"},"schema_version":"1.0","source":{"id":"astro-ph/9807021","kind":"arxiv","version":1}},"canonical_sha256":"d803a6f24126d7afef3aa0e2797e976b482b3dd11d9df570b8ca80a6f83cf305","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d803a6f24126d7afef3aa0e2797e976b482b3dd11d9df570b8ca80a6f83cf305","first_computed_at":"2026-07-04T16:06:49.794967Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:06:49.794967Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ng2yXj02245wBTt2QNhRNgoh65i114eDTaHekXvCsyvMQMXI/nkgsUdeHZKSvEHihnDrV6qpihx+TG0CSlvECQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:06:49.795449Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9807021","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fc867e35fcff70fd098339a0fba2b56c311dd5d7799119be7aa389993a63d182","sha256:c05915fb566b5bedd9b2f1601bf14d39ae9ef3e2f217adf10fa24a7df4a34821"],"state_sha256":"e1af0a70cfc49961f0239150e7af90328b322534951635cd903d511c6754f4d6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H24p9dgXaJOIgHMHJ0hL5b4z9tFx0j5Mb1g6FElu0qAAekruj39Igq0hhwcNW+pQZ4l4bW95tmK/etw7yNi8Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T18:08:41.420839Z","bundle_sha256":"3788b3922d9de88c48347c1ce55f7bd1a665244d7b9a9689e21366f5b04cf5f0"}}