Mon. Not. R. Astron. Soc., 481, 596-612 (2018/November-3)
K2-260 b: a hot Jupiter transiting an F star, and K2-261 b: a warm Saturn around a bright G star.
JOHNSON M.C., DAI F., JUSTESEN A.B., GANDOLFI D., HATZES A.P., NOWAK G., ENDL M., COCHRAN W.D., HIDALGO D., WATANABE N., PARVIAINEN H., HIRANO T., VILLANUEVA S., PRIETO-ARRANZ J., NARITA N., PALLE E., GUENTHER E.W., BARRAGAN O., TRIFONOV T., NIRAULA P., MacQUEEN P.J., CABRERA J., CSIZMADIA S., EIGMULLER P., GRZIWA S., KORTH J., PATZOLD M., SMITH A.M.S., ALBRECHT S., ALONSO R., DEEG H., ERIKSON A., ESPOSITO M., FRIDLUND M., FUKUI A., KUSAKABE N., KUZUHARA M., LIVINGSTON J., MONTANES RODRIGUEZ P., NESPRAL D., PERSSON C.M., PURISMO T., RAIMUNDO S., RAUER H., RIBAS I., TAMURA M., VAN EYLEN V. and WINN J.N.
Abstract (from CDS):
We present the discovery and confirmation of two new transiting giant planets from the Kepler extended mission K2. K2-260 b is a hot Jupiter transiting a V = 12.7 F6V star in K2 Field 13, with a mass and radius of M* = 1.39–0.06+0.05 M☉ and R* = 1.69 ± 0.03 R☉. The planet has an orbital period of P = 2.627 d, and a mass and radius of MP=1.42+0.31^–0.32 M_ J_ and RP=1.552+0.048^–0.057 R_ J_. This is the first K2 hot Jupiter with a detected secondary eclipse in the Kepler bandpass, with a depth of 71 ± 15 ppm, which we use to estimate a geometric albedo of Ag ∼ 0.2. We also detected a candidate stellar companion at 0.6 arcsec from K2-260; we find that it is very likely physically associated with the system, in which case it would be an M5-6V star at a projected separation of ∼400 au. K2-261 b is a warm Saturn transiting a bright (V = 10.5) G7IV/V star in K2 Field 14. The host star is a metal rich ([Fe/H] = 0.36 ± 0.06), mildly evolved 1.10–0.02+0.01 M☉ star with R* = 1.65 ± 0.04 R☉. Thanks to its location near the main-sequence turn-off, we can measure a relatively precise age of 8.8–0.3+0.4 Gyr. The planet has P = 11.633 d, MP = 0.223 ± 0.031 M_ J_, and RP=0.850+0.026^–0.022 R_ J_, and its orbit is eccentric (e=0.39 ±0.15). Its brightness and relatively large transit depth make this one of the best-known warm Saturns for follow-up observations to further characterize the planetary system.
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
planets and satellites: detection - planets and satellites: individual: K2-260 b, K2-261 b
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