Silicon in the dayside atmospheres of two ultra-hot Jupiters

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 spectrosco...

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Detalles Bibliográficos
Autores: Cont, David, Yan, F., Reiners, Ansgar, Nortmann, L., Molaverdikhani, K., Pallé, Enric, Stangret, M., Henning, Thomas, Ribas, Ignasi, Quirrenbach, Andreas, Caballero, J. A., Zapatero Osorio, María Rosa, Amado, Pedro J., Aceituno, Jesús, Casasayas-Barris, N., Czesla, S., Kaminski, Adrian, López-Puertas, Manuel, Montes, David, Morales, Juan Carlos, Morello, Giuseppe, Nagel, Evangelos, Sánchez-López, A., Sedaghati, E., Zechmeister, Mathias
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/267626
Acceso en línea:http://hdl.handle.net/10261/267626
Access Level:acceso abierto
Palabra clave:Planets and satellites: atmospheres
Techniques: spectroscopic
Planets and satellites: individual: WASP-33b
Planets and satellites: individual: KELT-20b/MASCARA-2b
Descripción
Sumario: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 4.8σ and 5.4σ, 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. © ESO 2022.

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