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Ninan, John Wisniewski, Joseph Huehnerhoff, Kyle Kaplan, Lawrence Ramsey, Leslie Hebb, Marissa Maney, Michael Endl, Paul Robertson, Peter Brunt, Ryan Terrien, Samuel Halverson, Scott A. Diddams, Shubham Kanodia, Steinn Sigurdsson, Suvrath Mahadevan, William Cochran","submitted_at":"2019-12-01T00:12:17Z","abstract_excerpt":"We validate the discovery of a 2 Earth radii sub-Neptune-size planet around the nearby high proper motion M2.5-dwarf G 9-40 (EPIC 212048748), using high-precision near-infrared (NIR) radial velocity (RV) observations with the Habitable-zone Planet Finder (HPF), precision diffuser-assisted ground-based photometry with a custom narrow-band photometric filter, and adaptive optics imaging. At a distance of $d=27.9\\mathrm{pc}$, G 9-40b is the second closest transiting planet discovered by K2 to date. 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