HD 219666 b: a hot-Neptune from TESS Sector 1
Artikel i vetenskaplig tidskrift, 2019
We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD219666 (M-star = 0.92 +/- 0.03 M-circle dot, R-star = 1.03 +/- 0.03 R-circle dot, tau(star) = 10 +/- 2 Gyr). With a mass of M-b = 16.6 +/- 1.3 M-circle plus, a radius of R-b = 4.71 +/- 0.17 R-circle plus, and an orbital period of P-orb similar or equal to 6 days, HD219666 b is a new member of a rare class of exoplanets: the hot-Neptunes. The Transiting Exoplanet Survey Satellite (TESS) observed HD219666 (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 (T-eff = 5527 +/- 65 K, log g(star) = 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 atmospheric metal-to-hydrogen content and thermal structure could provide us with important clues on the formation mechanisms of this class of objects.
planets and satellites: fundamental parameters
techniques: photometric
techniques: radial velocities
stars: fundamental parameters
planets and satellites: individual: HD 219666 b
planets and satellites: detection
Författare
M. Esposito
Thüringer Landessternwarte Tautenburg
D. J. Armstrong
The University of Warwick
D. Gandolfi
Universita degli Studi di Torino
V Adibekyan
Universidade do Porto
Malcolm Fridlund
Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
N. C. Santos
Universidade do Porto
J. H. Livingston
University of Tokyo
E. Delgado Mena
Universidade do Porto
L. Fossati
Österreichische Akademie der Wissenschaften
J. Lillo-Box
European Southern Observatory Santiago
O. Barragan
Universita degli Studi di Torino
D. Barrado
Centro de Astrobiología (INTA-CSIC)
P. E. Cubillos
Österreichische Akademie der Wissenschaften
B. Cooke
The University of Warwick
A. B. Justesen
Aarhus Universitet
F. Meru
The University of Warwick
R. F. Diaz
Universidad de Buenos Aires
E. Dai
Princeton University
Massachusetts Institute of Technology (MIT)
L. D. Nielsen
Université de Genève
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
P. J. Wheatley
The University of Warwick
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
V. Van Eylen
Princeton University
M. M. Musso
Universita degli Studi di Torino
R. Alonso
Instituto de Astrofísica de Canarias
Universidad de la Laguna
P. G. Beck
Universidad de la Laguna
Instituto de Astrofísica de Canarias
S. C. C. Barros
Universidade do Porto
D. Bayliss
The University of Warwick
A. S. Bonomo
Istituto nazionale di astrofisica (INAF)
F. Bouchy
Université de Genève
D. J. A. Brown
The University of Warwick
E. Bryant
The University of Warwick
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
W. D. Cochran
The University of Texas at Austin
S. Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
H. Deeg
Universidad de la Laguna
Instituto de Astrofísica de Canarias
O. Demangeon
Universidade do Porto
M. Deleuil
Aix-Marseille Université
X. Dumusque
Université de Genève
P. Eigmuller
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Endl
The University of Texas at Austin
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
F. Faedi
The University of Warwick
P. Figueira
European Southern Observatory Santiago
Universidade do Porto
A. Fukui
National Astronomical Observatory of Japan
S. Grziwa
Universität zu Köln
E. W. Guenther
Thüringer Landessternwarte Tautenburg
D. Hidalgo
Universidad de la Laguna
Instituto de Astrofísica de Canarias
M. Hjorth
Aarhus Universitet
T. Hirano
Tokyo Institute of Technology
S. Hojjatpanah
Universidade do Porto
E. Knudstrup
Aarhus Universitet
J. Korth
Universität zu Köln
K. W. F. Lam
Technische Universität Berlin
J. de Leon
University of Tokyo
M. N. Lund
Aarhus Universitet
R. Luque
Universidad de la Laguna
Instituto de Astrofísica de Canarias
S. Mathur
Universidad de la Laguna
Instituto de Astrofísica de Canarias
P. Montanes Rodriguez
Instituto de Astrofísica de Canarias
Universidad de la Laguna
N. Narita
National Institutes of Natural Sciences
University of Tokyo
Instituto de Astrofísica de Canarias
Japan Science and Technology Agency
National Astronomical Observatory of Japan
D. Nespral
Universidad de la Laguna
Instituto de Astrofísica de Canarias
P. Niraula
Massachusetts Institute of Technology (MIT)
G. Nowak
Instituto de Astrofísica de Canarias
Universidad de la Laguna
H. P. Osborn
Aix-Marseille Université
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
M. Paetzold
Universität zu Köln
D. Pollacco
The University of Warwick
J. Prieto-Arranz
Instituto de Astrofísica de Canarias
Universidad de la Laguna
H. Rauer
Technische Universität Berlin
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Freie Universität Berlin
S. Redfield
Wesleyan University
I Ribas
Institut d'Estudis Espacials de Catalunya (IEEC)
Consejo Superior de Investigaciones Científicas (CSIC)
S. G. Sousa
Universidade do Porto
A. M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Tala-Pinto
Universität Heidelberg
S. Udry
Université de Genève
J. N. Winn
Princeton University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 623 623 A165Ämneskategorier
Astronomi, astrofysik och kosmologi
Annan fysik
Den kondenserade materiens fysik
Infrastruktur
Onsala rymdobservatorium
DOI
10.1051/0004-6361/201834853