{"paper":{"title":"KPF Confirms a Polar Orbit for KELT-18 b","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Aaron Householder, Abby P. Shaum, Aida Behmard, Andrew W. Howard, Arpita Roy, Benjamin Fulton, Bradford Holden, Chris Smith, Christian Schwab, Edward Wishnow, Erik A. Petigura, Fei Dai, Grant M. Hill, Gu{\\dh}mundur Stef\\'ansson, Howard Isaacson, Joel N. Payne, Joshua N. Winn, Josh Walawender, Kyle Lanclos, Lauren M. Weiss, Max Brodheim, Russ R. Laher, Ryan A. Rubenzahl, Samuel Halverson, Sharon X. Wang, Steven R. Gibson, William Deich","submitted_at":"2024-07-30T21:12:57Z","abstract_excerpt":"We present the first spectroscopic transit results from the newly commissioned Keck Planet Finder on the Keck-I telescope at W. M. Keck Observatory. We observed a transit of KELT-18 b, an inflated ultra-hot Jupiter orbiting a hot star ($T_\\text{eff} = 6670$ K) with a binary stellar companion. By modeling the perturbation to the measured cross correlation functions using the Reloaded Rossiter-McLaughlin technique, we derived a sky projected obliquity of $\\lambda = -94.8 \\pm 0.7$ deg ($\\psi = 93.8_{-1.8}^{+1.6}$ deg for isotropic $i_\\star$). The data are consistent with an extreme stellar differ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.21196","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/2407.21196/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"}