{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:XD5NJPGAXA56CZAFTMORG7K7WQ","short_pith_number":"pith:XD5NJPGA","schema_version":"1.0","canonical_sha256":"b8fad4bcc0b83be164059b1d137d5fb410bf316d99adea6322802d86892d3bda","source":{"kind":"arxiv","id":"1307.2974","version":2},"attestation_state":"computed","paper":{"title":"Observations and three-dimensional ionization structure of the planetary nebula SuWt 2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Ashkbiz Danehkar, Barbara Ercolano, Quentin A. Parker","submitted_at":"2013-07-11T05:22:37Z","abstract_excerpt":"The planetary nebula SuWt 2 (PN G311.0+02.4), is an unusual object with a prominent, inclined central emission ellipse and faint bipolar extensions. It has two A-type stars in a proven binary system at the centre. However, the radiation from these two central stars is too soft to ionize the surrounding material leading to a so far fruitless search for the responsible ionizing source. Such a source is clearly required and has already been inferred to exist via an observed temporal variation of the centre-of-mass velocity of the A-type stars. Moreover, the ejected nebula is nitrogen-rich which r"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1307.2974","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-11T05:22:37Z","cross_cats_sorted":[],"title_canon_sha256":"c92de2de71b4d079d727586bec200c1d718cf169a13ff17c31be7b9a5ff48350","abstract_canon_sha256":"55c9c0fd060c2db1f771564beba2c208b18b98c34c22e79400e70457c9f0a4a8"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:25:40.563181Z","signature_b64":"9rxRZygZpJc3Bx/LikDmTbk9roPvo+96lFNITXO+Qf3Rak2UKMSb4ZhzIqP2QjRPMgU/IFE7g4L2PKWNcfZpBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b8fad4bcc0b83be164059b1d137d5fb410bf316d99adea6322802d86892d3bda","last_reissued_at":"2026-05-18T02:25:40.562635Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:25:40.562635Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observations and three-dimensional ionization structure of the planetary nebula SuWt 2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Ashkbiz Danehkar, Barbara Ercolano, Quentin A. Parker","submitted_at":"2013-07-11T05:22:37Z","abstract_excerpt":"The planetary nebula SuWt 2 (PN G311.0+02.4), is an unusual object with a prominent, inclined central emission ellipse and faint bipolar extensions. It has two A-type stars in a proven binary system at the centre. However, the radiation from these two central stars is too soft to ionize the surrounding material leading to a so far fruitless search for the responsible ionizing source. Such a source is clearly required and has already been inferred to exist via an observed temporal variation of the centre-of-mass velocity of the A-type stars. Moreover, the ejected nebula is nitrogen-rich which r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.2974","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1307.2974","created_at":"2026-05-18T02:25:40.562710+00:00"},{"alias_kind":"arxiv_version","alias_value":"1307.2974v2","created_at":"2026-05-18T02:25:40.562710+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.2974","created_at":"2026-05-18T02:25:40.562710+00:00"},{"alias_kind":"pith_short_12","alias_value":"XD5NJPGAXA56","created_at":"2026-05-18T12:28:06.772260+00:00"},{"alias_kind":"pith_short_16","alias_value":"XD5NJPGAXA56CZAF","created_at":"2026-05-18T12:28:06.772260+00:00"},{"alias_kind":"pith_short_8","alias_value":"XD5NJPGA","created_at":"2026-05-18T12:28:06.772260+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ","json":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ.json","graph_json":"https://pith.science/api/pith-number/XD5NJPGAXA56CZAFTMORG7K7WQ/graph.json","events_json":"https://pith.science/api/pith-number/XD5NJPGAXA56CZAFTMORG7K7WQ/events.json","paper":"https://pith.science/paper/XD5NJPGA"},"agent_actions":{"view_html":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ","download_json":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ.json","view_paper":"https://pith.science/paper/XD5NJPGA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1307.2974&json=true","fetch_graph":"https://pith.science/api/pith-number/XD5NJPGAXA56CZAFTMORG7K7WQ/graph.json","fetch_events":"https://pith.science/api/pith-number/XD5NJPGAXA56CZAFTMORG7K7WQ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ/action/storage_attestation","attest_author":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ/action/author_attestation","sign_citation":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ/action/citation_signature","submit_replication":"https://pith.science/pith/XD5NJPGAXA56CZAFTMORG7K7WQ/action/replication_record"}},"created_at":"2026-05-18T02:25:40.562710+00:00","updated_at":"2026-05-18T02:25:40.562710+00:00"}