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tokens: Acknowledgements The authors would like to thank Dr Sven Buder for his useful comments and discussion about Na abundances. Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. CARMENES is an instrument for the Centro Astronómico Hispano-Alemán de Calar Alto (CAHA, Almería, Spain) funded by the German Max-Planck-Gesellschaft (MPG), the Spanish Consejo Superior de Investigaciones Científicas (CSIC), the European Union through FEDER/ERF FICTS-2011-02 funds, and the members of the CARMENES Consortium. This work is partly financed by the Spanish Ministry of Economics and Competitiveness through project ESP2016-80 435-C2-2-R. G.C. acknowledges the support by the National Natural Science Foundation of China (Grant No. 11503088, 11573073, 11573075) and by the project “Technology of Space Telescope Detecting Exoplanet and Life” from National Defense Science and Engineering Bureau civil spaceflight advanced research project (D030201). F.Y. acknowledges the support of the DFG priority programme SPP 1992 “Exploring the Diversity of Extrasolar Planets (RE 1664/16-1)”. A.F. acknowledges the support from JSPS KAKENHI Grant Number JP17H04574. This work is partly supported by JSPS KAKENHI Grant Numbers JP18H01265 and 18H05439, and JST PRESTO Grant Number JPMJPR1775. This article is based on observations made with the MuSCAT2 instrument, developed by ABC, at Telescopio Carlos Sánchez operated on the island of Tenerife by the IAC in the Spanish Observatorio del Teide. This work made use of PyAstronomy and of the VALD database, operated at Uppsala University, the Institute of Astronomy RAS in Moscow, and the University of Vienna.