Giles, Helen A CBayliss, DanielEspinoza, NBrahm, RBlanco-Cuaresma, S.Shporer, AviArmstrong, David J.Lovis, CUdry, SBouchy, FrançoisMarmier, MJordán, ABento, Joao2021-11-092021-11-090035-8711http://hdl.handle.net/1885/251691We present the discovery of K2-140b, a P = 6.57 d Jupiter-mass (MP = 1.019 ± 0.070MJup) planet transiting a V = 12.5 (G5-spectral type) star in an eccentric orbit (e = 0.120-0.046 +0.056) detected using a combination of K2 photometry and ground-based observations. With a radius of 1.095 ± 0.018 RJup, the planet has a bulk density of 0.726 ± 0.062 ρJup. The host star has a [Fe/H] of 0.12 ± 0.045, and from the K2 light curve, we find a rotation period for the star of 16.3 ± 0.1 d. This discovery is the 9th hot Jupiter from K2 and highlights K2's ability to detect transiting giant planets at periods slightly longer than traditional, ground-based surveys. This planet is slightly inflated, but much less than others with similar incident fluxes. These are of interest for investigating the inflation mechanism of hot Jupiters.application/pdfen-AU© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Societytechniques: high angular resolutiontechniques: photometrictechniques: radial velocitiesplanets and satellites: detectionstars: individual: K2-140201810.1093/MNRAS/STX33002020-11-23