摘要：We report the discovery of K2-287b, a Saturn mass planet orbiting a G-dwarf with a period of P≈15 days. First uncovered as a candidate using K2 campaign 15 data, follow-up photometry and spectroscopy were used to determine a mass M M 0.317 0.026 P J = , radius R R 0.833 0.013 P J = , period P 14.893291 0.000025 = days, and eccentricity e 0.476 0.026 = . The host star is a metal-rich V=11.410±0.129 mag G-dwarf for which we estimate a mass M 1.056 0.021 0.022 = -+ M , radius R 1.070 0.010 = R , metallicity [Fe/H]=0.20± 0.05, and T 5673 75 eff = K. This warm eccentric planet with a time-averaged equilibrium temperature of T 800 eq » K adds to the small sample of giant planets orbiting nearby stars whose structure is not expected to be affected by stellar irradiation. Follow-up studies on the K2-287 system could help constrain theories of planet migration in close-in orbits.
关键词：planetary systems;planets and satellites: detection;planets and satellites: gaseous planets;stars: individual (K2-287)
