K2-260 b : A hot Jupiter transiting an F star, and K2-261 b: A warm Saturn around a bright G star
(2018) In Monthly Notices of the Royal Astronomical Society 481(1). p.596-612- 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... (More)
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.
(Less)
- author
- publishing date
- 2018-11-21
- type
- Contribution to journal
- publication status
- published
- keywords
- K2-261 b, Planets and satellites: detection, Planets and satellites: individual: K2-260 b
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 481
- issue
- 1
- pages
- 17 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85054090000
- ISSN
- 0035-8711
- DOI
- 10.1093/mnras/sty2238
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
- id
- 32161eff-57a5-4ebd-8f16-73c9870e4c0b
- date added to LUP
- 2023-02-02 11:21:00
- date last changed
- 2023-02-21 09:36:09
@article{32161eff-57a5-4ebd-8f16-73c9870e4c0b,
abstract = {{<p>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<sub>-0.06</sub><sup>+0.05</sup> M<sub>⊙</sub> 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<sub>P</sub> = 1.42<sub>-0.32</sub><sup>+0.31</sup> M<sub>J</sub> and R<sub>P</sub> = 1.552<sub>-0.057</sub><sup>+0.048</sup> R<sub>J</sub>. 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<sub>g</sub> ~ 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<sub>-0.02</sub><sup>+0.01</sup> M<sub>⊙</sub> 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<sub>-0.3</sub><sup>+0.4</sup> Gyr. The planet has P = 11.633 d, M<sub>P</sub> = 0.223 ± 0.031 M<sub>J</sub>, and R<sub>P</sub> = 0.850<sub>-0.022</sub><sup>+0.026</sup> R<sub>J</sub>, 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.</p>}},
author = {{Johnson, M. C. and Dai, F. and Justesen, A. B. and Gandolfi, D. and Hatzes, A. P. and Nowak, G. and Endl, M. and Cochran, W. D. and Hidalgo, D. and Watanabe, N. and Parviainen, H. and Hirano, T. and Villanueva, S. and Prieto-Arranz, J. and Narita, N. and Palle, E. and Guenther, E. W. and Barragán, O. and Trifonov, T. and Niraula, P. and MacQueen, P. J. and Cabrera, J. and Csizmadia, Sz and Eigmüller, Ph and Grziwa, S. and Korth, J. and Pätzold, M. and Smith, A. M.S. and Albrecht, S. and Alonso, R. and Deeg, H. and Erikson, A. and Esposito, M. and Fridlund, M. and Fukui, A. and Kusakabe, N. and Kuzuhara, M. and Livingston, J. and Montañes Rodriguez, P. and Nespral, D. and Persson, C. M. and Purismo, T. and Raimundo, S. and Rauer, H. and Ribas, I. and Tamura, M. and Van Eylen, V. and Winn, J. N.}},
issn = {{0035-8711}},
keywords = {{K2-261 b; Planets and satellites: detection; Planets and satellites: individual: K2-260 b}},
language = {{eng}},
month = {{11}},
number = {{1}},
pages = {{596--612}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{K2-260 b : A hot Jupiter transiting an F star, and K2-261 b: A warm Saturn around a bright G star}},
url = {{http://dx.doi.org/10.1093/mnras/sty2238}},
doi = {{10.1093/mnras/sty2238}},
volume = {{481}},
year = {{2018}},
}