EPIC 228735255b - An eccentric 6.57 day transiting hot Jupiter in Virgo

Abstract: We present the discovery of EPIC 228735255b, a P= 6.57 days Jupiter-mass (M$P$=1.019$\pm$0.070 M${Jup}$) planet transiting a V=12.5 (G5-spectral type) star in an eccentric orbit (e=$0.120^{+0.056}_{-0.046}$) detected using a combination of K2 photometry and ground-based observations. With a radius of 1.095$\pm$0.018R${Jup}$ the planet has a bulk density of 0.726$\pm$0.062$\rho{Jup}$. The host star has a [Fe/H] of 0.12$\pm$0.045, and from the K2 light curve we find a rotation period for the star of 16.3$\pm$0.1 days. 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.