{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:VNCANGS3OGFBKJWRUJIAX5A275","short_pith_number":"pith:VNCANGS3","schema_version":"1.0","canonical_sha256":"ab44069a5b718a1526d1a2500bf41aff477824974946c9b1b2c2c7da3884ee56","source":{"kind":"arxiv","id":"2305.13598","version":1},"attestation_state":"computed","paper":{"title":"FAST search for circumstellar atomic hydrogen. II. Is BD+303639 an interacting planetary nebula?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Albert Zijlstra, Chuan-Peng Zhang, Jun-ichi Nakashima, Quentin A Parker, Xu-Jia Ouyang, Yong Zhang","submitted_at":"2023-05-23T01:59:33Z","abstract_excerpt":"The young, compact, very high surface brightness but low excitation planetary nebula (PN) BD+303639 is one of the very few PNe that have been reported to exhibit the 21cm HI emission line. As part of a long-term programme to search for circumstellar atomic hydrogen, we observed the 21cm feature toward BD+303639 with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Assuming a direct association between the PN and the detected HI emission, these new observations show that this surrounding emission is significantly more spatially extended than indicated by previous interferometri"},"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":"2305.13598","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2023-05-23T01:59:33Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"b6e66a33ec3a7cdd8adc8af7d109f9b132b7d222fad587d2562021383cf1a571","abstract_canon_sha256":"be2d0865a3b1a0c4695d2d5ba6f09e68f15138849332afb1e0e19f1f0b8ddeb5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:36:37.458263Z","signature_b64":"14WS9Xo1+U2JT8YtQ629qu9y0FJ4Y+KD7QEGRXJEkhrFoujOwBb8eUU+ShqF2h0CnO5mfzW0R1Ex6pk8AbuoCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ab44069a5b718a1526d1a2500bf41aff477824974946c9b1b2c2c7da3884ee56","last_reissued_at":"2026-07-05T06:36:37.457754Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:36:37.457754Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"FAST search for circumstellar atomic hydrogen. II. Is BD+303639 an interacting planetary nebula?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Albert Zijlstra, Chuan-Peng Zhang, Jun-ichi Nakashima, Quentin A Parker, Xu-Jia Ouyang, Yong Zhang","submitted_at":"2023-05-23T01:59:33Z","abstract_excerpt":"The young, compact, very high surface brightness but low excitation planetary nebula (PN) BD+303639 is one of the very few PNe that have been reported to exhibit the 21cm HI emission line. As part of a long-term programme to search for circumstellar atomic hydrogen, we observed the 21cm feature toward BD+303639 with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Assuming a direct association between the PN and the detected HI emission, these new observations show that this surrounding emission is significantly more spatially extended than indicated by previous interferometri"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2305.13598","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/2305.13598/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2305.13598","created_at":"2026-07-05T06:36:37.457814+00:00"},{"alias_kind":"arxiv_version","alias_value":"2305.13598v1","created_at":"2026-07-05T06:36:37.457814+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2305.13598","created_at":"2026-07-05T06:36:37.457814+00:00"},{"alias_kind":"pith_short_12","alias_value":"VNCANGS3OGFB","created_at":"2026-07-05T06:36:37.457814+00:00"},{"alias_kind":"pith_short_16","alias_value":"VNCANGS3OGFBKJWR","created_at":"2026-07-05T06:36:37.457814+00:00"},{"alias_kind":"pith_short_8","alias_value":"VNCANGS3","created_at":"2026-07-05T06:36:37.457814+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2608.06245","citing_title":"HI envelope around the carbon star V420 Vul","ref_index":36,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275","json":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275.json","graph_json":"https://pith.science/api/pith-number/VNCANGS3OGFBKJWRUJIAX5A275/graph.json","events_json":"https://pith.science/api/pith-number/VNCANGS3OGFBKJWRUJIAX5A275/events.json","paper":"https://pith.science/paper/VNCANGS3"},"agent_actions":{"view_html":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275","download_json":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275.json","view_paper":"https://pith.science/paper/VNCANGS3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2305.13598&json=true","fetch_graph":"https://pith.science/api/pith-number/VNCANGS3OGFBKJWRUJIAX5A275/graph.json","fetch_events":"https://pith.science/api/pith-number/VNCANGS3OGFBKJWRUJIAX5A275/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275/action/timestamp_anchor","attest_storage":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275/action/storage_attestation","attest_author":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275/action/author_attestation","sign_citation":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275/action/citation_signature","submit_replication":"https://pith.science/pith/VNCANGS3OGFBKJWRUJIAX5A275/action/replication_record"}},"created_at":"2026-07-05T06:36:37.457814+00:00","updated_at":"2026-07-05T06:36:37.457814+00:00"}