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K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star

Barragán, O. (author)
Universita degli Studi di Torino,University of Turin
Gandolfi, D. (author)
Universita degli Studi di Torino,University of Turin
Smith, A. M. S. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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Deeg, H. J. (author)
Universidad de la Laguna,University of La Laguna
Fridlund, Malcolm, 1952 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Persson, Carina, 1964 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Donati, P. (author)
Istituto nazionale di astrofisica (INAF)
Endl, M. (author)
The University of Texas at Austin, USA
Csizmadia, Sz. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Grziwa, S. (author)
Universität zu Köln,University of Cologne
Nespral, D. (author)
Universidad de la Laguna,University of La Laguna
Hatzes, Artie P. (author)
Thüringer Landessternwarte Tautenburg
Cochran, W. D. (author)
The University of Texas at Austin, USA
Fossati, L. (author)
Österreichische Akademie der Wissenschaften,Austrian Academy of Sciences
Brems, S. S. (author)
Ruprecht-Karls-Universität Heidelberg,Heidelberg University
Cabrera, J. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Cusano, F. (author)
Istituto nazionale di astrofisica (INAF)
Eigmüller, Ph. (author)
Universita degli Studi di Torino,University of Turin
Eiroa, C. (author)
Universidad Autonoma de Madrid (UAM)
Erikson, A. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Guenther, E. W. (author)
Thüringer Landessternwarte Tautenburg
Korth, J. (author)
Universität zu Köln,University of Cologne
Lorenzo-Oliveira, D. (author)
Universidade de Sao Paulo (USP),University of Sao Paulo (USP)
Mancini, L. (author)
Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Istituto nazionale di astrofisica (INAF),Universita degli Studi di Roma Tor Vergata,University of Rome Tor Vergata
Pätzold, M. (author)
Universität zu Köln,University of Cologne
Prieto-Arranz, J. (author)
Universidad de la Laguna,University of La Laguna
Rauer, H. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR),Technische Universität Berlin
Rebollido, I. (author)
Universidad Autonoma de Madrid (UAM)
Saario, J. (author)
Nordic Optical Telescope
Zakhozhay, O. V. (author)
National Academy of Sciences in Ukraine,Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy
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 (creator_code:org_t)
2017-12-13
2018
English.
In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 475:2, s. 1765-1776
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (Teq = 547 ± 25 K) on a 29-d orbit around an active (log R'_HK = -4.46 ± 0.06) K0V star in K2 Campaign 7. We derive the system's parameters by combining the K2 photometry with ground-based follow-up observations. With a mass of 0.387_-0.075^+0.083 M_J and radius of 0.808_-0.033^+0.034 R_J, K2-139 b is one of the transiting warm Jupiters with the lowest mass known to date. The planetary mean density of 0.91_-0.20^+0.24 g/cm^3 can be explained with a core of ~50 M⊕. Given the brightness of the host star (V = 11.653 mag), the relatively short transit duration (~5 h), and the expected amplitude of the Rossiter-McLaughlin effect (~25m/s), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

planets and satellites: detection
stars: fundamental parameters
planets and satellites: individual: K2-139 b (EPIC 218916923b)
planetary systems

Publication and Content Type

art (subject category)
ref (subject category)

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