Details

Autor(en) / Beteiligte

• 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
• Niraula, P
• MacQueen, P J
• Cabrera, J
• Csizmadia, Sz
• Eigmüller, Ph
• Grziwa, S
• Korth, J
• Pätzold, 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
• Montañes Rodriguez, P
• Nespral, D
• Persson, C M
• Purismo, T
• Raimundo, S
• Rauer, H
• Ribas, I
• Tamura, M
• Van Eylen, V
• Winn, J N

Titel

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

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2018-11, Vol.481 (1), p.596-612

Erscheinungsjahr

2018

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• 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+0.05M⊙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+0.31MJand RP= 1.552-0.057+0.048RJ. 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+0.01M⊙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+0.4Gyr. The planet has P = 11.633 d, MP= 0.223 ± 0.031 MJ, and RP= 0.850-0.022+0.026RJ, 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.