{"paper":{"title":"Disappearance of N2H+ from the Gas Phase in the Class 0 Protostar IRAM 04191","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) SAp, A. Belloche (1), Bonn, CEA/Saclay), P. Andre (2) ((1) MPIFR","submitted_at":"2004-02-01T21:44:45Z","abstract_excerpt":"We present a high-resolution spectroscopic study of the envelope of the young Class 0 protostar IRAM 04191+1522 in Taurus. N2H+(1-0) observations with the Plateau de Bure Interferometer and the IRAM 30m telescope demonstrate that the molecular ion N2H+ disappears from the gas phase in the inner envelope (r < 1600 AU, n(H2) > 4-7 * 1e5 cm-3). This may result from N2 depletion on polar ice mantles and enhanced grain chemistry."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0402016","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"}