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

Universite de Geneve

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 Astrofisico de Canarias

Universidad de la Laguna

P. G. Beck

Universidad de la Laguna

Instituto Astrofisico 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

Universite de Geneve

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 Astrofisico de Canarias

O. Demangeon

Universidade do Porto

M. Deleuil

Aix-Marseille Université

X. Dumusque

Universite de Geneve

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 Astrofisico 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 Astrofisico de Canarias

S. Mathur

Universidad de la Laguna

Instituto Astrofisico de Canarias

P. Montanes Rodriguez

Instituto Astrofisico de Canarias

Universidad de la Laguna

N. Narita

National Institutes of Natural Sciences

University of Tokyo

Instituto Astrofisico de Canarias

Japan Science and Technology Agency

National Astronomical Observatory of Japan

D. Nespral

Universidad de la Laguna

Instituto Astrofisico de Canarias

P. Niraula

Massachusetts Institute of Technology (MIT)

G. Nowak

Instituto Astrofisico de Canarias

Universidad de la Laguna

H. P. Osborn

Aix-Marseille Université

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

M. Paetzold

Universität zu Köln

D. Pollacco

The University of Warwick

J. Prieto-Arranz

Instituto Astrofisico 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

S. G. Sousa

Universidade do Porto

A. M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Tala-Pinto

Universität Heidelberg

S. Udry

Universite de Geneve

J. N. Winn

Princeton University

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 623 623 A165

Ämneskategorier

Astronomi, astrofysik och kosmologi

Annan fysik

Den kondenserade materiens fysik

Infrastruktur

Onsala rymdobservatorium

DOI

10.1051/0004-6361/201834853

Mer information

Senast uppdaterat

2019-05-17