Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

@article{Lopez2019ExoplanetCI,
  title={Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS},
  author={T Lopez and Susana C. C. Barros and Alexandre Santerne and Magali Deleuil and Vardan Adibekyan and Jose M. Almenara and David J Armstrong and B. Brugger and David Barrado and Daniel Bayliss and Isabelle Boisse and Aldo Stefano Bonomo and François Bouchy and D. J. A. Brown and Eduardo Carli and Olivier D. S. Demangeon and Xavier Dumusque and Rodrigo F. D'iaz and Jo{\~a}o P. Faria and Pedro Figueira and Emma Foxell and Helen A. C. Giles and Guillaume H'ebrard and S. Hojjatpanah and James Kirk and Jorge Lillo-Box and Christophe Lovis and Olivier Mousis and Hugo J. da N'obrega and Louise D. Nielsen and Jason J. Neal and H. P. Osborn and Francesco A. Pepe and Don Pollacco and Nuno C. Santos and S{\'e}rgio G. Sousa and St{\'e}phane Udry and Arthur Vigan and Peter J. Wheatley},
  journal={Astronomy \& Astrophysics},
  year={2019}
}
The detection of low-mass transiting exoplanets in multiple systems brings new constraints to planetary formation and evolution processes and challenges the current planet formation theories. Nevertheless, only a mere fraction of the small planets detected by Kepler and K2 have precise mass measurements, which are mandatory to constrain their composition. We aim to characterise the planets that orbit the relatively bright star K2-138. This system is dynamically particular as it presents the… 
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Context. Accurate parameters of the host stars of exoplanets are needed for interpreting the new planetary systems. The CoRoT satellite recently discovered a transiting rocky planet with a density
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