We present the discovery of EPIC 228735255b, a P= 6.57 days Jupiter-mass (MP=1.019±0.070 MJup) 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±0.018RJup the planet has a bulk density of 0.726±0.062ρJup. 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 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.
@article{arxiv.1706.06865,
title = {EPIC 228735255b - An eccentric 6.57 day transiting hot Jupiter in Virgo},
author = {H. A. C. Giles and D. Bayliss and N. Espinoza and R. Brahm and S. Blanco-Cuaresma and A. Shporer and D. Armstrong and C. Lovis and S. Udry and F. Bouchy and M. Marmier and A. Jordán and J. Bento and A. Collier Cameron and R. Sefako and W. D. Cochran and F. Rojas and M. Rabus and J. S. Jenkins and M. Jones and B. Pantoja and M. Soto and R. Jensen-Clem and D. A. Duev and M. Salama and R. Riddle and C. Baranec and N. M. Law},
journal= {arXiv preprint arXiv:1706.06865},
year = {2018}
}