{"paper":{"title":"Oxygen Isotopic Composition of an Enstatite Ribbon of Probable Cometary Origin","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Alexander N. Krot, Dave J. Joswiak, Donald E. Brownlee, Gary R. Huss, Josiah B. Lewis, Kainen L. Ut, Kazuhide Nagashima, Ryan C. Ogliore","submitted_at":"2019-07-25T16:35:25Z","abstract_excerpt":"Filamentary enstatite crystals are found in interplanetary dust particles of likely cometary origin but are very rare or absent in meteorites. Crystallographic characteristics of filamentary enstatites indicate that they condensed directly from vapor. We measured the O isotopic composition of an enstatite ribbon from a giant cluster interplanetary dust particle to be $\\delta^{18}\\rm{O}{=25{\\pm}55}$, $\\delta^{17}\\rm{O}{=-19{\\pm}129}$, $\\Delta^{17}\\rm{O}{=-32{\\pm}134}$ (2$\\sigma$ errors), which is inconsistent at the 2$\\sigma$ level with the composition of the Sun inferred from the Genesis solar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.11177","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"}