{"paper":{"title":"The carbon isotope ratio of \\beta\\ Pic b with high-resolution spectroscopy","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"D. Gonz\\'alez Picos, I.A.G. Snellen, I. Koutalios, J. L. Birkby, M.A. Kenworthy, N. Grasser, R. Landman, S. de Regt, T. Stolker","submitted_at":"2026-06-10T17:58:27Z","abstract_excerpt":"Isotopic ratios trace the formation and evolution of planets and link their atmospheres to the chemistry of their natal protoplanetary discs. We measure $^{12}\\mathrm{C}/^{13}\\mathrm{C} = 58^{+18}_{-15}$ in the atmosphere of the young super-Jupiter $\\beta$ Pic b from 11 nights of CRIRES+ K-band spectroscopy ($\\mathcal{R} \\approx 100{,}000$) at the Very Large Telescope (VLT). We detect both $^{12}\\mathrm{CO}$ and $^{13}\\mathrm{CO}$ and constrain $^{12}\\mathrm{C}/^{13}\\mathrm{C}$ with a Bayesian retrieval jointly fitted with near-infrared photometry. The inferred $^{12}\\mathrm{C}/^{13}\\mathrm{C}"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.12401","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/2606.12401/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"}