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Author (up) Cont, D.; Yan, F.; Reiners, A.; Nortmann, L.; Molaverdikhani, K.; Palle, E.; Stangret, M.; Henning, T.; Ribas, I.; Quirrenbach, A.; Caballero, J.A.; Osorio, M.R.Z.; Amado, P.J.; Aceituno, J.; Casasayas-Barris, N.; Czesla, S.; Kaminski, A.; Lopez-Puertas, M.; Montes, D.; Morales, J.C.; Morello, G.; Nagel, E.; Sanchez-Lopez, A.; Sedaghati, E.; Zechmeister, M. doi  openurl
  Title Silicon in the dayside atmospheres of two ultra-hot Jupiters Type
  Year 2022 Publication Astronomy & Astrophysics Abbreviated Journal Astron. Astrophys.  
  Volume 657 Issue Pages L2  
  Keywords planets and satellites: atmospheres; techniques: spectroscopic; planets and satellites: individual: WASP-33b; planets and satellites: individual: KELT-20b/MASCARA-2b  
  Abstract Atmospheres of highly irradiated gas giant planets host a large variety of atomic and ionic species. Here we observe the thermal emission spectra of the two ultra-hot Jupiters WASP-33b and KELT-20b /MASCARA-2b in the near-infrared wavelength range with CARMENES. Via high-resolution Doppler spectroscopy, we searched for neutral silicon (Si) in their dayside atmospheres. We detect the Si spectral signature of both planets via cross-correlation with model spectra. Detection levels of 4.8 sigma and 5.4 sigma, respectively, are observed when assuming a solar atmospheric composition. This is the first detection of Si in exoplanet atmospheres. The presence of Si is an important finding due to its fundamental role in cloud formation and, hence, for the planetary energy balance. Since the spectral lines are detected in emission, our results also confirm the presence of an inverted temperature profile in the dayside atmospheres of both planets.  
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  Series Volume Series Issue Edition  
  ISSN 0004-6361 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000740006300008 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1535  
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