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Anders Zinck Justesen

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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  • M. C. Johnson, Ohio State Univ, Ohio State University, Dept Astron
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  • F. Dai, Princeton Univ, Princeton University, Dept Astrophys Sci
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  • A. B. Justesen
  • D. Gandolfi, Univ Torino, University of Turin, Dipartimento Fis
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  • A. P. Hatzes, Thuringer Landessternwarte Tautenberg
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  • G. Nowak, Instituto de Astrofísica de Canarias
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  • M. Endl, Univ Texas Austin, University of Texas System, University of Texas Austin, McDonald Observ
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  • W. D. Cochran, Univ Texas Austin, University of Texas System, University of Texas Austin, McDonald Observ
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  • D. Hidalgo, Instituto de Astrofísica de Canarias
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  • N. Watanabe, Grad Univ Adv Studies SOKENDAI, Graduate University for Advanced Studies - Japan, Dept Astron Sci
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  • H. Parviainen, Instituto de Astrofísica de Canarias
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  • T. Hirano, Univ Hawaii, University of Hawaii System, Inst Astron
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  • S. Villanueva, Ohio State Univ, Ohio State University, Dept Astron
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  • J. Prieto-Arranz, Instituto de Astrofísica de Canarias
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  • N. Narita, JST, Japan Science & Technology Agency (JST), PRESTO, Bunkyo Ku
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  • E. Palle, Instituto de Astrofísica de Canarias
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  • E. W. Guenther, Thuringer Landessternwarte Tautenberg
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  • O. Barragan, Univ Torino, University of Turin, Dipartimento Fis
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  • T. Trifonov, Max Planck Inst Astron, Max Planck Society
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  • P. Niraula, Wesleyan Univ, Wesleyan University, Van Vleck Observ
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  • P. J. MacQueen, Univ Texas Austin, University of Texas System, University of Texas Austin, McDonald Observ
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  • J. Cabrera, German Aerosp Ctr, German Aerospace Centre (DLR), Helmholtz Association, Inst Planetary Res
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  • Sz. Csizmadia, German Aerosp Ctr, German Aerospace Centre (DLR), Helmholtz Association, Inst Planetary Res
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  • Ph. Eigmueller, German Aerosp Ctr, German Aerospace Centre (DLR), Helmholtz Association, Inst Planetary Res
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  • S. Grziwa, Univ Cologne, University of Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch
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  • J. Korth, Univ Cologne, University of Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch
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  • M. Paetzold, Univ Cologne, University of Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch
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  • A. M. S. Smith, German Aerosp Ctr, German Aerospace Centre (DLR), Helmholtz Association, Inst Planetary Res
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  • S. Albrecht
  • R. Alonso, Instituto de Astrofísica de Canarias
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  • H. Deeg, Instituto de Astrofísica de Canarias
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  • A. Erikson, German Aerosp Ctr, German Aerospace Centre (DLR), Helmholtz Association, Inst Planetary Res
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  • M. Esposito, Thuringer Landessternwarte Tautenberg
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  • M. Fridlund, Leiden Univ, Leiden University, Leiden Observ
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  • A. Fukui, Natl Astron Observ Japan, National Astronomical Observatory of Japan, National Institutes of Natural Sciences (NINS) - Japan, Okayama Astrophys Observ
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  • N. Kusakabe, Natl Inst Nat Sci, National Institutes of Natural Sciences (NINS) - Japan, Astrobiol Ctr
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  • M. Kuzuhara, Natl Inst Nat Sci, National Institutes of Natural Sciences (NINS) - Japan, Astrobiol Ctr
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  • J. Livingston, Univ Tokyo, University of Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku
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  • P. Montanes Rodriguez, Instituto de Astrofísica de Canarias
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  • D. Nespral, Instituto de Astrofísica de Canarias
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  • C. M. Persson, Chalmers Univ Technol, Chalmers University of Technology, Onsala Space Observ, Dept Space Earth & Environm
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  • T. Purismo, Nord Opt Telescope
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  • S. Raimundo, Københavns Universitet
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  • H. Rauer, TU Berlin, Technical University of Berlin, Ctr Astron & Astrophys
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  • I. Ribas, Inst Ciencies Espai CSIC IEEC, Autonomous University of Barcelona, Institut d'Estudis Espacials de Catalunya (IEEC), University of Barcelona
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  • M. Tamura, Natl Inst Nat Sci, National Institutes of Natural Sciences (NINS) - Japan, Astrobiol Ctr
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  • V. Van Eylen, Leiden Univ, Leiden University, Leiden Observ
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  • J. N. Winn, Princeton Univ, Princeton University, Dept Astrophys Sci

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-star = 1.39(-0.06)(+0.05) M-circle dot and R-star = 1.69 +/- 0.03 R-circle dot. 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) similar to 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 similar to 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-circle dot star with R-star = 1.65 +/- 0.04 R-circle dot. 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.

OriginalsprogEngelsk
TidsskriftMonthly Notices of the Royal Astronomical Society
Vol/bind481
Nummer1
Sider (fra-til)596-612
Antal sider17
ISSN0035-8711
DOI
StatusUdgivet - nov. 2018

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