Early Release Science of the exoplanet WASP-39b with JWST NIRISS
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Fecha
2023-02
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
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Título del volumen
Editor
Nature Research
Nombre de Curso
Licencia CC
CC BY 4.0 Attribution 4.0 International Deed
Licencia CC
https://creativecommons.org/licenses/by/4.0/
Resumen
The Saturn-mass exoplanet WASP-39b has been the subject of extensive efforts to determine its atmospheric properties using transmission spectroscopy1–4. However, these efforts have been hampered by modelling degeneracies between composition and cloud properties that are caused by limited data quality5–9. Here we present the transmission spectrum of WASP-39b obtained using the Single-Object Slitless Spectroscopy (SOSS) mode of the Near Infrared Imager and Slitless Spectrograph (NIRISS) instrument on the JWST. This spectrum spans 0.6–2.8 μm in wavelength and shows several water-absorption bands, the potassium resonance doublet and signatures of clouds. The precision and broad wavelength coverage of NIRISS/SOSS allows us to break model degeneracies between cloud properties and the atmospheric composition of WASP-39b, favouring a heavy-element enhancement (‘metallicity’) of about 10–30 times the solar value, a sub-solar carbon-to-oxygen (C/O) ratio and a solar-to-super-solar potassium-to-oxygen (K/O) ratio. The observations are also best explained by wavelength-dependent, non-grey clouds with inhomogeneous coverageof the planet’s terminator. © 2023, The Author(s).
Notas
Indexación: Scopus
Palabras clave
Extraterrestrial Environment, Oxygen, Potassium, Spectrum Analysis, Water
Citación
Nature. Volume 614, Issue 7949, Pages 670 - 675. 23 February 2023
DOI
10.1038/s41586-022-05674-1