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McElwain, Paul Robertson, Pranav Premnath, Qian Gong, Rae Holcomb, Rafael Luque, Ryan C. Terrien, Samuel Halverson, Shubham Kanodia, Te Han","submitted_at":"2024-08-06T00:28:44Z","abstract_excerpt":"We present a new analysis of Kepler-21, the brightest (V = 8.5) Kepler system with a known transiting exoplanet, Kepler-21 b. Kepler-21 b is a radius valley planet ($R = 1.6\\pm 0.2 R_{\\oplus}$) with an Earth-like composition (8.38$\\pm$1.62 g/cc), though its mass and radius fall in the regime of possible \"water worlds.\" We utilize new Keck/HIRES and WIYN/NEID radial velocity (RV) data in conjunction with Kepler and TESS photometry to perform a detailed study of activity mitigation between photometry and RVs. 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