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  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., et al. (2018). K2-260 b: a hot Jupiter transiting an F star, and K2-261 b: a warm Saturn around a bright G star. Monthly Notices of the Royal Astronomical Society, 481, 596-612.

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Johnson, M. C.1, Author
Dai, F.1, Author
Justesen, A. B.1, Author
Gandolfi, D.1, Author
Hatzes, A. P.1, Author
Nowak, G.1, Author
Endl, M.1, Author
Cochran, W. D.1, Author
Hidalgo, D.1, Author
Watanabe, N.1, Author
Parviainen, H.1, Author
Hirano, T.1, Author
Villanueva, S.1, Author
Prieto-Arranz, J.1, Author
Narita, N.1, Author
Palle, E.1, Author
Guenther, E. W.1, Author
Barragán, O.1, Author
Trifonov, T.1, Author
Niraula, P.1, Author
MacQueen, P. J.1, AuthorCabrera, J.1, AuthorCsizmadia, Sz1, AuthorEigmüller, Ph1, AuthorGrziwa, S.1, AuthorKorth, J.1, AuthorPätzold, M.1, AuthorSmith, A. M. S.1, AuthorAlbrecht, S.1, AuthorAlonso, R.1, AuthorDeeg, H.1, AuthorErikson, A.1, AuthorEsposito, M.1, AuthorFridlund, M.1, AuthorFukui, A.1, AuthorKusakabe, N.1, AuthorKuzuhara, M.1, AuthorLivingston, J.1, AuthorMontañes Rodriguez, P.1, AuthorNespral, D.1, AuthorPersson, C. M.1, AuthorPurismo, T.1, AuthorRaimundo, S.1, AuthorRauer, H.1, AuthorRibas, I.1, AuthorTamura, M.1, AuthorVan Eylen, V.1, AuthorWinn, J. N.1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: planets and satellites: detection planets and satellites: individual: K2-260 b K2-261 b Astrophysics - Earth and Planetary Astrophysics
 Abstract: 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 M_P=1.42^{+0.31}_{-0.32} M_J and R_P=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 R_P=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.

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 Dates: 2018
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 481 Sequence Number: - Start / End Page: 596 - 612 Identifier: -