Astronomy & Astrophysics manuscript no. HD219134˙published © ESO 2019 October 31, 2019 From the stellar properties of HD 219134 to the internal compositions of its transiting exoplanets. R. Ligi1, C. Dorn2, A. Crida3;4, Y. Lebreton5;6, O. Creevey3, F. Borsa1, D. Mourard3, N. Nardetto3, I. Tallon-Bosc7, F. Morand3, E. Poretti1. 1 INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy e-mail:
[email protected] 2 University of Zurich, Institut of Computational Sciences, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland 3 Universite´ Coteˆ d’Azur, Observatoire de la Coteˆ d’Azur, CNRS, Laboratoire Lagrange, Bd de l’Observatoire, CS 34229, 06304 Nice cedex 4, France 4 Institut Universitaire de France, 103 Boulevard Saint-Michel, 75005 Paris, France 5 LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universites,´ UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cite,´ 92195 Meudon Cedex, France 6 Univ. Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France 7 Univ. Lyon, Univ. Lyon1, Ens de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574, F-69230 Saint-Genis- Laval, France Received 5 July 2019 / Accepted 20 September 2019 ABSTRACT Context. The harvest of exoplanet discoveries has opened the area of exoplanet characterisation. But this cannot be achieved without a careful analysis of the host star parameters. Aims. The system of HD 219134 hosts two transiting exoplanets and at least two additional non-transiting exoplanets. We revisit the properties of this system using direct measurements of the stellar parameters to investigate the composition of the two transiting exoplanets.