{"paper":{"title":"CH in absorption in IRAS16293-2422","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"2), 4), C. Ceccarelli (6) ((1) Universit\\'e de Toulouse, C. Vastel (1, E. Caux (1, Institut de Plan\\'etologie et d'Astrophysique de Grenoble (IPAG)), Institut de Recherche en Astrophysique et Plan\\'etologie (IRAP) - (2) CNRS, IRAP - (3) Univ. Bordeaux, Kobe University - (6) UJF-Grenoble 1 / CNRS-INSU, LAB - (4) CNRS, LAB - (5) Department of Earth, Planetary Sciences, S. Bottinelli (1, UPS-OMP, V. Wakelam (3, Y. Aikawa (5)","submitted_at":"2014-05-05T10:16:57Z","abstract_excerpt":"While recent studies of the solar-mass protostar IRAS16293-2422 have focused on its inner arcsecond, the wealth of Herschel/HIFI data has shown that the structure of the outer envelope and of the transition region to the more diffuse ISM is not clearly constrained. We use rotational ground-state transitions of CH (methylidyne), as a tracer of the lower-density envelope. Assuming LTE, we perform a $\\chi^2$ minimization of the high spectral resolution HIFI observations of the CH transitions at ~532 and ~536 GHz in order to derive column densities in the envelope and in the foreground cloud. We o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.0846","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"}