High-resolution confirmation of an extended helium atmosphere around WASP-107b

This work has been carried out within the frame of the National Centre for Competence in Research “PlanetS” supported by the Swiss National Science Foundation (SNSF). R.A., V.B., C.L., D.E., and F.P. acknowledge the financial support of the SNSF. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (project FOUR ACES; grant agreement No 724427). A.W. acknowledges the financial support of the SNSF by the grant number P2GEP2_178191.