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Journal Articles Astronomy and Astrophysics - A&A Year : 2019

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

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M. Esposito
  • Function : Author
D. J. Armstrong
  • Function : Author
D. Gandolfi
V. Adibekyan
  • Function : Author
M. Fridlund
N. C. Santos
  • Function : Author
J. H. Livingston
  • Function : Author
E. Delgado Mena
  • Function : Author
L. Fossati
  • Function : Author
J. Lillo-Box
  • Function : Author
O. Barragán
  • Function : Author
D. Barrado
  • Function : Author
P. E. Cubillos
  • Function : Author
B. Cooke
  • Function : Author
A. B. Justesen
F. Meru
  • Function : Author
R. F. Díaz
  • Function : Author
F. Dai
  • Function : Author
L. D. Nielsen
  • Function : Author
C. M. Persson
  • Function : Author
P. J. Wheatley
  • Function : Author
A. P. Hatzes
  • Function : Author
V. van Eylen
  • Function : Author
M. M. Musso
  • Function : Author
R. Alonso
  • Function : Author
P. G. Beck
  • Function : Author
S. C. C. Barros
  • Function : Author
D. Bayliss
  • Function : Author
A. S. Bonomo
  • Function : Author
F. Bouchy
  • Function : Author
D. J. A. Brown
  • Function : Author
E. Bryant
  • Function : Author
J. Cabrera
  • Function : Author
W. D. Cochran
  • Function : Author
S. Csizmadia
H. Deeg
  • Function : Author
O. Demangeon
X. Dumusque
  • Function : Author
P. Eigmüller
  • Function : Author
M. Endl
  • Function : Author
A. Erikson
  • Function : Author
F. Faedi
  • Function : Author
P. Figueira
  • Function : Author
A. Fukui
  • Function : Author
S. Grziwa
  • Function : Author
E. W. Guenther
  • Function : Author
D. Hidalgo
  • Function : Author
M. Hjorth
  • Function : Author
T. Hirano
  • Function : Author
S. Hojjatpanah
  • Function : Author
E. Knudstrup
  • Function : Author
J. Korth
K. W. F. Lam
  • Function : Author
J. de Leon
  • Function : Author
M. N. Lund
  • Function : Author
R. Luque
S. Mathur
P. Montañés Rodríguez
  • Function : Author
N. Narita
  • Function : Author
D. Nespral
  • Function : Author
P. Niraula
  • Function : Author
G. Nowak
E. Pallé
  • Function : Author
M. Pätzold
  • Function : Author
D. Pollacco
  • Function : Author
J. Prieto-Arranz
  • Function : Author
H. Rauer
  • Function : Author
S. Redfield
I. Ribas
  • Function : Author
S. G. Sousa
  • Function : Author
A. M. S. Smith
  • Function : Author
M. Tala-Pinto
  • Function : Author
S. Udry
J. N. Winn
  • Function : Author

Abstract

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 R'HK = -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.

Based on observations made with the 3.6 m-ESO telescope at La Silla observatory under ESO programmes IDs 1102.C-0923 (PI: Gandolfi) and 1102.C-0249 (PI: Armstrong).

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Dates and versions

insu-03666765 , version 1 (13-05-2022)

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M. Esposito, D. J. Armstrong, D. Gandolfi, V. Adibekyan, M. Fridlund, et al.. HD 219666 b: a hot-Neptune from TESS Sector 1. Astronomy and Astrophysics - A&A, 2019, 623, ⟨10.1051/0004-6361/201834853⟩. ⟨insu-03666765⟩
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