K2-260 b: A hot Jupiter transiting an F star, and K2-261 b: A warm Saturn around a bright G star

M. C. Johnson; F. Dai; A. B. Justesen; D. Gandolfi; A. P. Hatzes; G. Nowak; M. Endl; W. D. Cochran; D. Hidalgo; N. Watanabe; H. Parviainen; T. Hirano; S. Villanueva; J. Prieto-Arranz; N. Narita; E. Palle; E. W. Guenther; O. Barragán; T. Trifonov; P. Niraula; P. J. MacQueen; J. Cabrera; Sz Csizmadia; Ph Eigmüller; S. Grziwa; J. Korth; M. Pätzold; A. M.S. Smith; S. Albrecht; R. Alonso; H. Deeg; A. Erikson; M. Esposito; M. Fridlund; A. Fukui; N. Kusakabe; M. Kuzuhara; J. Livingston; P. Montañes Rodriguez; D. Nespral; C. M. Persson; T. Purismo; S. Raimundo; H. Rauer; I. Ribas; M. Tamura; V. Van Eylen; J. N. Winn

doi:10.1093/mnras/sty2238

K2-260 b: A hot Jupiter transiting an F star, and K2-261 b: A warm Saturn around a bright G star

M. C. Johnson, F. Dai, A. B. Justesen, D. Gandolfi, A. P. Hatzes, G. Nowak, M. Endl, W. D. Cochran, D. Hidalgo, N. Watanabe, H. Parviainen, T. Hirano, S. Villanueva, J. Prieto-Arranz, N. Narita, E. Palle, E. W. Guenther, O. Barragán, T. Trifonov, P. NiraulaP. J. MacQueen, J. Cabrera, Sz Csizmadia, Ph Eigmüller, S. Grziwa, J. Korth, M. Pätzold, A. M.S. Smith, S. Albrecht, R. Alonso, H. Deeg, A. Erikson, M. Esposito, M. Fridlund, A. Fukui, N. Kusakabe, M. Kuzuhara, J. Livingston, P. Montañes Rodriguez, D. Nespral, C. M. Persson, T. Purismo, S. Raimundo, H. Rauer, I. Ribas, M. Tamura, V. Van Eylen, J. N. Winn

Astrophysical Sciences

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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_-0.32^+0.31 M_J and R_P = 1.552_-0.057^+0.048 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 A_g ~ 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, M_P = 0.223 ± 0.031 M_J, and R_P = 0.850_-0.022^+0.026 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.

Original language	English (US)
Pages (from-to)	596-612
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	481
Issue number	1
DOIs	https://doi.org/10.1093/mnras/sty2238
State	Published - Nov 21 2018

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

K2-261 b
Planets and satellites: detection
Planets and satellites: individual: K2-260 b

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10.1093/mnras/sty2238

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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., Barragán, O., Trifonov, T., ... Winn, J. N. (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(1), 596-612. https://doi.org/10.1093/mnras/sty2238

@article{fdca454493c24ea7bb3ee4d016bc9824,

title = "K2-260 b: A hot Jupiter transiting an F star, and K2-261 b: A warm Saturn around a bright G star",

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 MP = 1.42-0.32+0.31 MJ and RP = 1.552-0.057+0.048 RJ. 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 MJ, and RP = 0.850-0.022+0.026 RJ, 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.",

keywords = "K2-261 b, Planets and satellites: detection, Planets and satellites: individual: K2-260 b",

author = "Johnson, {M. C.} and F. Dai and Justesen, {A. B.} and D. Gandolfi and Hatzes, {A. P.} and G. Nowak and M. Endl and Cochran, {W. D.} and D. Hidalgo and N. Watanabe and H. Parviainen and T. Hirano and S. Villanueva and J. Prieto-Arranz and N. Narita and E. Palle and Guenther, {E. W.} and O. Barrag{\'a}n and T. Trifonov and P. Niraula and MacQueen, {P. J.} and J. Cabrera and Sz Csizmadia and Ph Eigm{\"u}ller and S. Grziwa and J. Korth and M. P{\"a}tzold and Smith, {A. M.S.} and S. Albrecht and R. Alonso and H. Deeg and A. Erikson and M. Esposito and M. Fridlund and A. Fukui and N. Kusakabe and M. Kuzuhara and J. Livingston and {Monta{\~n}es Rodriguez}, P. and D. Nespral and Persson, {C. M.} and T. Purismo and S. Raimundo and H. Rauer and I. Ribas and M. Tamura and {Van Eylen}, V. and Winn, {J. N.}",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2018",

month = nov,

day = "21",

doi = "10.1093/mnras/sty2238",

language = "English (US)",

volume = "481",

pages = "596--612",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

Johnson, MC, Dai, F, Justesen, AB, Gandolfi, D, Hatzes, AP, Nowak, G, Endl, M, Cochran, WD, Hidalgo, D, Watanabe, N, Parviainen, H, Hirano, T, Villanueva, S, Prieto-Arranz, J, Narita, N, Palle, E, Guenther, EW, Barragán, O, Trifonov, T, Niraula, P, MacQueen, PJ, Cabrera, J, Csizmadia, S, Eigmüller, P, Grziwa, S, Korth, J, Pätzold, M, Smith, AMS, Albrecht, S, Alonso, R, Deeg, H, Erikson, A, Esposito, M, Fridlund, M, Fukui, A, Kusakabe, N, Kuzuhara, M, Livingston, J, Montañes Rodriguez, P, Nespral, D, Persson, CM, Purismo, T, Raimundo, S, Rauer, H, Ribas, I, Tamura, M, Van Eylen, V & Winn, JN 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, vol. 481, no. 1, pp. 596-612. https://doi.org/10.1093/mnras/sty2238

TY - JOUR

T1 - K2-260 b

T2 - A hot Jupiter transiting an F star, and K2-261 b: A warm Saturn around a bright G star

AU - Johnson, M. C.

AU - Dai, F.

AU - Justesen, A. B.

AU - Gandolfi, D.

AU - Hatzes, A. P.

AU - Nowak, G.

AU - Endl, M.

AU - Cochran, W. D.

AU - Hidalgo, D.

AU - Watanabe, N.

AU - Parviainen, H.

AU - Hirano, T.

AU - Villanueva, S.

AU - Prieto-Arranz, J.

AU - Narita, N.

AU - Palle, E.

AU - Guenther, E. W.

AU - Barragán, O.

AU - Trifonov, T.

AU - Niraula, P.

AU - MacQueen, P. J.

AU - Cabrera, J.

AU - Csizmadia, Sz

AU - Eigmüller, Ph

AU - Grziwa, S.

AU - Korth, J.

AU - Pätzold, M.

AU - Smith, A. M.S.

AU - Albrecht, S.

AU - Alonso, R.

AU - Deeg, H.

AU - Erikson, A.

AU - Esposito, M.

AU - Fridlund, M.

AU - Fukui, A.

AU - Kusakabe, N.

AU - Kuzuhara, M.

AU - Livingston, J.

AU - Montañes Rodriguez, P.

AU - Nespral, D.

AU - Persson, C. M.

AU - Purismo, T.

AU - Raimundo, S.

AU - Rauer, H.

AU - Ribas, I.

AU - Tamura, M.

AU - Van Eylen, V.

AU - Winn, J. N.

PY - 2018/11/21

Y1 - 2018/11/21

N2 - 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 = 1.42-0.32+0.31 MJ and RP = 1.552-0.057+0.048 RJ. 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 MJ, and RP = 0.850-0.022+0.026 RJ, 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.

AB - 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 = 1.42-0.32+0.31 MJ and RP = 1.552-0.057+0.048 RJ. 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 MJ, and RP = 0.850-0.022+0.026 RJ, 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.

KW - K2-261 b

KW - Planets and satellites: detection

KW - Planets and satellites: individual: K2-260 b

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DO - 10.1093/mnras/sty2238

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SN - 0035-8711

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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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

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