CARMENES detection of the Ca ii infrared triplet and possible evidence of He i in the atmosphere of WASP-76b

@article{CasasayasBarris2021CARMENESDO,
  title={CARMENES detection of the Ca ii infrared triplet and possible evidence of He i in the atmosphere of WASP-76b},
  author={N. Casasayas-Barris and J. Orell-Miquel and Monika Stangret and Lisa Nortmann and F. Yan and Mahmoudreza Oshagh and Enric Pall{\'e} and Jorge Sanz-Forcada and Manuel L'opez-Puertas and Evangelos Nagel and Rafael Luque and Giuseppe Morello and I. A. G. Snellen and Mathias Zechmeister and Andreas Quirrenbach and Jos{\'e} A. Caballero and Ignasi Ribas and A. Reiners and Pedro J. Amado and G. Bergond and S. Czesla and Th. Henning and Sara Khalafinejad and Karan Molaverdikhani and David Montes and M. Perger and A. S'anchez-L'opez and Elyar Sedaghati},
  journal={Astronomy \& Astrophysics},
  year={2021}
}
Ultra-hot Jupiters are highly irradiated gas giants with equilibrium temperatures typically higher than 2000 K. Atmospheric studies of these planets have shown that their transmission spectra are rich in metal lines, with some of these metals being ionised due to the extreme temperatures. Here, we use two transit observations of WASP-76b obtained with the CARMENES spectrograph to study the atmosphere of this planet using high-resolution transmission spectroscopy. Taking advantage of the two…