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K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission

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  • J. Korth, University of Cologne
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  • Sz Csizmadia, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • D. Gandolfi, University of Turin
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  • M. Fridlund, Chalmers University of Technology, Leiden Observatory Research Institute
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  • M. Pätzold, University of Cologne
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  • T. Hirano, Tokyo Institute of Technology
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  • J. Livingston, University Tokyo
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  • C. M. Persson, Chalmers University of Technology
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  • H. J. Deeg, La Laguna University, Instituto de Astrofísica de Canarias
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  • A. B. Justesen
  • O. Barragán, University of Turin
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  • S. Grziwa, University of Cologne
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  • M. Endl, University of Texas at Austin
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  • R. Tronsgaard, Nordic Optical Telescope, Danmarks Tekniske Universitet
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  • F. Dai, Massachusetts Institute of Technology, Princeton University
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  • W. D. Cochran, University of Texas at Austin
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  • S. Albrecht
  • R. Alonso, La Laguna University, Instituto de Astrofísica de Canarias
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  • J. Cabrera, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • P. W. Cauley, Wesleyan University
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  • F. Cusano, Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
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  • Ph Eigmüller, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Technical University of Berlin
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  • A. Erikson, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • M. Esposito, Thüringer Landessternwarte Tautenburg (TLS)
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  • E. W. Guenther, Thüringer Landessternwarte Tautenburg (TLS)
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  • A. P. Hatzes, Thüringer Landessternwarte Tautenburg (TLS)
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  • D. Hidalgo, La Laguna University, Instituto de Astrofísica de Canarias
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  • M. Kuzuhara, NINS, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
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  • P. Montañes, La Laguna University, Instituto de Astrofísica de Canarias
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  • N. R. Napolitano, Osservatorio Astronomico di Capodimonte
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  • N. Narita, University Tokyo, Instituto de Astrofísica de Canarias, NINS, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
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  • P. Niraula, Wesleyan University
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  • D. Nespral, La Laguna University, Instituto de Astrofísica de Canarias
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  • G. Nowak, La Laguna University, Instituto de Astrofísica de Canarias
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  • E. Palle, La Laguna University, Instituto de Astrofísica de Canarias
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  • C. E. Petrillo, University of Groningen
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  • S. Redfield, Wesleyan University
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  • J. Prieto-Arranz, La Laguna University, Instituto de Astrofísica de Canarias
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  • H. Rauer, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Technical University of Berlin, Free University of Berlin
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  • A. M.S. Smith, Institute for Planetary Research, DLR, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • C. Tortora, University of Groningen
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  • V. Van Eylen, Leiden Observatory Research Institute
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  • J. N. Winn, Princeton University

We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V=12.6mag, metal-poor ([Fe/H] = -0.65 ± 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V=12.6mag G6V ([Fe/H] = +0.10 ± 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of Mp = 11.3 ± 1.9M⊕ and a radius of Rp = 2.2 ± 0.1R⊕, yielding a mean density of ρp = 5.6 ± 1.9 g cm-3, suggesting a rocky composition. Given its radius, K2-180b is above the region of the so-called 'planetary radius gap'. K2-180b is in addition not only one of the densest mini-Neptune-sized planets, but also one of the few mini-Neptune-sized planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.

OriginalsprogEngelsk
TidsskriftMonthly Notices of the Royal Astronomical Society
Vol/bind482
Nummer2
Sider (fra-til)1807-1823
Antal sider17
ISSN0035-8711
DOI
StatusUdgivet - 2019

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