{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:3JLWGLYLAN3DR5JOAVWLZXGR3O","short_pith_number":"pith:3JLWGLYL","schema_version":"1.0","canonical_sha256":"da57632f0b037638f52e056cbcdcd1dba9255828067885d9af109bde35f92a21","source":{"kind":"arxiv","id":"1505.07550","version":1},"attestation_state":"computed","paper":{"title":"Analytical Formulas of Molecular Ion Abundances and N2H+ Ring in Protoplanetary Disks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Chunhua Qi, Hideko Nomura, Kenji Furuya, Yuri Aikawa","submitted_at":"2015-05-28T05:15:17Z","abstract_excerpt":"We investigate the chemistry of ion molecules in protoplanetary disks, motivated by the detection of N$_2$H$^+$ ring around TW Hya. While the ring inner radius coincides with the CO snow line, it is not apparent why N$_2$H$^+$ is abundant outside the CO snow line in spite of the similar sublimation temperatures of CO and N$_2$. Using the full gas-grain network model, we reproduced the N$_2$H$^+$ ring in a disk model with millimeter grains. The chemical conversion of CO and N$_2$ to less volatile species (sink effect hereinafter) is found to affect the N$_2$H$^+$ distribution. Since the efficie"},"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":"1505.07550","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-28T05:15:17Z","cross_cats_sorted":[],"title_canon_sha256":"0aaa58c9629c8dc382594d88bee8a5c1758f09016777adca4b533aaef08c3596","abstract_canon_sha256":"6d3dcc93561d9fc73f27f8bf1577070c98fa25db7850fd5b946832aa5bf3a404"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:53.265290Z","signature_b64":"mWolTiH08Rrn0hsVNftfLT5Vv+ajrnFtfcgt14WdG/zuEhuEHmayBVv3OVkVE3HW2G7887gXhShxISOywwkRCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"da57632f0b037638f52e056cbcdcd1dba9255828067885d9af109bde35f92a21","last_reissued_at":"2026-05-18T01:36:53.264690Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:53.264690Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Analytical Formulas of Molecular Ion Abundances and N2H+ Ring in Protoplanetary Disks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Chunhua Qi, Hideko Nomura, Kenji Furuya, Yuri Aikawa","submitted_at":"2015-05-28T05:15:17Z","abstract_excerpt":"We investigate the chemistry of ion molecules in protoplanetary disks, motivated by the detection of N$_2$H$^+$ ring around TW Hya. While the ring inner radius coincides with the CO snow line, it is not apparent why N$_2$H$^+$ is abundant outside the CO snow line in spite of the similar sublimation temperatures of CO and N$_2$. Using the full gas-grain network model, we reproduced the N$_2$H$^+$ ring in a disk model with millimeter grains. The chemical conversion of CO and N$_2$ to less volatile species (sink effect hereinafter) is found to affect the N$_2$H$^+$ distribution. Since the efficie"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.07550","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1505.07550","created_at":"2026-05-18T01:36:53.264798+00:00"},{"alias_kind":"arxiv_version","alias_value":"1505.07550v1","created_at":"2026-05-18T01:36:53.264798+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.07550","created_at":"2026-05-18T01:36:53.264798+00:00"},{"alias_kind":"pith_short_12","alias_value":"3JLWGLYLAN3D","created_at":"2026-05-18T12:29:02.477457+00:00"},{"alias_kind":"pith_short_16","alias_value":"3JLWGLYLAN3DR5JO","created_at":"2026-05-18T12:29:02.477457+00:00"},{"alias_kind":"pith_short_8","alias_value":"3JLWGLYL","created_at":"2026-05-18T12:29:02.477457+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/3JLWGLYLAN3DR5JOAVWLZXGR3O","json":"https://pith.science/pith/3JLWGLYLAN3DR5JOAVWLZXGR3O.json","graph_json":"https://pith.science/api/pith-number/3JLWGLYLAN3DR5JOAVWLZXGR3O/graph.json","events_json":"https://pith.science/api/pith-number/3JLWGLYLAN3DR5JOAVWLZXGR3O/events.json","paper":"https://pith.science/paper/3JLWGLYL"},"agent_actions":{"view_html":"https://pith.science/pith/3JLWGLYLAN3DR5JOAVWLZXGR3O","download_json":"https://pith.science/pith/3JLWGLYLAN3DR5JOAVWLZXGR3O.json","view_paper":"https://pith.science/paper/3JLWGLYL","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1505.07550&json=true","fetch_graph":"https://pith.science/api/pith-number/3JLWGLYLAN3DR5JOAVWLZXGR3O/graph.json","fetch_events":"https://pith.science/api/pith-number/3JLWGLYLAN3DR5JOAVWLZXGR3O/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/3JLWGLYLAN3DR5JOAVWLZXGR3O/action/timestamp_anchor","attest_storage":"https://pith.science/pith/3JLWGLYLAN3DR5JOAVWLZXGR3O/action/storage_attestation","attest_author":"https://pith.science/pith/3JLWGLYLAN3DR5JOAVWLZXGR3O/action/author_attestation","sign_citation":"https://pith.science/pith/3JLWGLYLAN3DR5JOAVWLZXGR3O/action/citation_signature","submit_replication":"https://pith.science/pith/3JLWGLYLAN3DR5JOAVWLZXGR3O/action/replication_record"}},"created_at":"2026-05-18T01:36:53.264798+00:00","updated_at":"2026-05-18T01:36:53.264798+00:00"}