HD 219666 b: a hot-Neptune from TESS Sector 1

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  • M. Esposito, Thüringer Landessternwarte Tautenburg (TLS)
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  • D. J. Armstrong, The University of Warwick
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  • D. Gandolfi, Università degli Studi di Torino
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  • V. Adibekyan, CAUP
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  • M. Fridlund, Chalmers University of Technology, Onsala Space Observatory, Leiden Observatory Research Institute
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  • N. C. Santos, CAUP, Universidade do Porto
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  • J. H. Livingston, University Tokyo
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  • E. Delgado Mena, CAUP
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  • L. Fossati, Austrian Academy of Sciences
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  • J. Lillo-Box, European Southern Observatory Santiago
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  • O. Barragán, Università degli Studi di Torino
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  • D. Barrado, Centro de Astrobiología (CSIC-INTA)
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  • P. E. Cubillos, Austrian Academy of Sciences
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  • B. Cooke, The University of Warwick, Centre for Exoplanets and Habitability
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  • A. B. Justesen
  • F. Meru, The University of Warwick
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  • R. F. Díaz, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.
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  • F. Dai, Princeton University, Princeton, NJ, Massachusetts Institute of Technology
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  • L. D. Nielsen, Geneva Observatory, University of Geneva, Sauverny, Switzerland, Université de Genève
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  • C. M. Persson, Chalmers University of Technology, Onsala Space Observatory
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  • P. J. Wheatley, The University of Warwick
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  • A. P. Hatzes, Thüringer Landessternwarte Tautenburg (TLS)
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  • V. Van Eylen, Department of Astrophysical Sciences, Princeton University, Princeton University, Princeton, NJ
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  • M. M. Musso, Università degli Studi di Torino
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  • R. Alonso, Instituto de Astrofísica de Canarias, La Laguna University
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  • P. G. Beck, Instituto de Astrofísica de Canarias, La Laguna University
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  • S. C.C. Barros, CAUP
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  • D. Bayliss, The University of Warwick
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  • A. S. Bonomo, Napoli Capodimonte
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  • F. Bouchy, Université de Genève
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  • D. J.A. Brown, The University of Warwick
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  • E. Bryant, The University of Warwick
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  • J. Cabrera, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • W. D. Cochran, University of Texas, Austin, Texas
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  • S. Csizmadia, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • H. Deeg, Instituto de Astrofísica de Canarias, La Laguna University
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  • O. Demangeon, CAUP
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  • M. Deleuil, Laboratoire d'Astrophysique de Marseille - LAM, Université d'Aix-Marseille & CNRS, Marseille Cedex 13, France
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  • X. Dumusque, Université de Genève
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  • P. Eigmüller, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • M. Endl, University of Texas, Austin, Texas
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  • A. Erikson, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre
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  • F. Faedi, The University of Warwick
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  • P. Figueira, CAUP, European Southern Observatory Santiago
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  • A. Fukui, National Astronomical Observatory of Japan
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  • S. Grziwa, Universitat zu Koln
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  • E. W. Guenther, Thüringer Landessternwarte Tautenburg (TLS)
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  • D. Hidalgo, Instituto de Astrofísica de Canarias, La Laguna University
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  • M. Hjorth
  • T. Hirano, Tokyo Institute of Technology
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  • S. Hojjatpanah, CAUP, Universidade do Porto
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  • E. Knudstrup
  • J. Korth, Universitat zu Koln
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  • K. W.F. Lam, Technical University of Berlin
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  • J. De Leon, University Tokyo
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  • M. N. Lund
  • R. Luque, Instituto de Astrofísica de Canarias, La Laguna University
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  • S. Mathur, Instituto de Astrofísica de Canarias, La Laguna University
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  • P. Montañés Rodríguez, Instituto de Astrofísica de Canarias, La Laguna University
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  • N. Narita, University Tokyo, Instituto de Astrofísica de Canarias, National Astronomical Observatory of Japan, NINS, Japan Science and Technology Agency
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  • D. Nespral, Instituto de Astrofísica de Canarias, La Laguna University
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  • P. Niraula, Massachusetts Institute of Technology
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  • G. Nowak, Instituto de Astrofísica de Canarias, La Laguna University
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  • H. P. Osborn, Laboratoire d'Astrophysique de Marseille - LAM, Université d'Aix-Marseille & CNRS, Marseille Cedex 13, France
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  • E. Pallé, Instituto de Astrofísica de Canarias, La Laguna University
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  • M. Pätzold, Universitat zu Koln
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  • D. Pollacco, The University of Warwick
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  • J. Prieto-Arranz, Instituto de Astrofísica de Canarias, La Laguna University
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  • H. Rauer, Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Technical University of Berlin, School of Business and Economics
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  • S. Redfield, Wesleyan University Middletown
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  • I. Ribas, Instituto de Ciencias del Espacio (ICE-CSIC/IEEC), Institut d'Estudis Espacials de Catalunya
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  • S. G. Sousa, CAUP
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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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  • M. Tala-Pinto, Landessternwarte Heidelberg
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  • S. Udry, Université de Genève
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  • J. N. Winn, Princeton University, Princeton, NJ

We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD 219666 (M = 0.92 ± 0.03 M, R = 1.03 ± 0.03 R, τ = 10 ± 2 Gyr). With a mass of Mb = 16.6 ± 1.3 M, a radius of Rb = 4.71 ± 0.17 R, and an orbital period of Porb ≃ 6 days, HD 219666 b is a new member of a rare class of exoplanets: the hot-Neptunes. The Transiting Exoplanet Survey Satellite (TESS) observed HD 219666 (also known as TOI-118) in its Sector 1 and the light curve shows four transit-like events, equally spaced in time. We confirmed the planetary nature of the candidate by gathering precise radial-velocity measurements with the High Accuracy Radial velocity Planet Searcher (HARPS) at ESO 3.6 m. We used the co-added HARPS spectrum to derive the host star fundamental parameters (Teff = 5527 ± 65 K, log g = 4.40 ± 0.11 (cgs), [Fe/H]= 0.04 ± 0.04 dex, log RHK = -5.07 ± 0.03), as well as the abundances of many volatile and refractory elements. The host star brightness (V = 9.9) makes it suitable for further characterisation by means of in-transit spectroscopy. The determination of the planet orbital obliquity, along with the atmosphericmetal-to-hydrogen content and thermal structure could provide us with important clues on the formation mechanisms of this class of objects.

OriginalsprogEngelsk
ArtikelnummerA165
TidsskriftAstronomy and Astrophysics
Vol/bind623
Antal sider11
ISSN0004-6361
DOI
StatusUdgivet - 2019

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