{"paper":{"title":"The watery atmosphere of HD~209458~b revealed by joint $K$- and $L$-band high-resolution spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Andrew Skemer, Ashley Baker, Benjamin Calvin, Ben Sappey, Chih-Chun Hsu, Daniel Echeverri, Dimitri Mawet, Evan Morris, Geoffrey A. Blake, Greg Doppmann, Jacklyn Pezzato-Rovner, Jacques-Robert Delorme, Jason J. Wang, Jean-Baptiste Ruffio, Jerry W. Xuan, Ji Wang, J. Kent Wallace, Joshua Liberman, Julie Inglis, Katelyn Horstman, Luke Finnerty, Michael P. Fitzgerald, Nemanja Jovanovic, Nicole L. Wallack, Randall Bartos, Ronald A. L\\'opez, Sylvain Cetre, Tobias Schofield, Yinzi Xin","submitted_at":"2025-08-13T03:03:03Z","abstract_excerpt":"We present a joint analysis of high-resolution $K$- and $L$-band observations of the benchmark hot Jupiter \\hdb\\ from the Keck Planet Imager and Characterizer (KPIC). One half night of observations were obtained in each bandpass covering similar pre-eclipse phases. The two epochs were then jointly analyzed using our atmospheric retrieval pipeline based on \\petit\\ to constrain the atmospheric pressure-temperature profile and chemical composition. Consistent with recent results from \\textit{JWST} observations at lower spectral resolution, we obtain an oxygen-rich composition for \\hdb\\ ($\\rm C/O "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.09448","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/2508.09448/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"}