K2-140b - an eccentric 6.57 d transiting hot Jupiter in Virgo
Bouchy, F.; Cochran, W. D.; Blanco-Cuaresma, S.; Duev, D. A.; Collier Cameron, A.; Lovis, C.; Udry, S.; Rabus, M.; Sefako, R.; Espinoza, N.; Soto, M.; Jordán, A.; Armstrong, D.; Jenkins, J. S.; Bayliss, D.; Shporer, A.; Bento, J.; Brahm, R.; Pantoja, B.; Salama, M.; Marmier, M.; Law, N. M.; Baranec, C.; Rojas, F.; Jones, M.; Riddle, R.; Jensen-Clem, R.; Giles, H. A. C.
Switzerland, Chile, United States, United Kingdom, Germany, Australia, South Africa
Abstract
We 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^{+0.056}_{-0.046}) 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.