Early Release Science of the exoplanet WASP-39b with JWST NIRISS

Nature · 2023 · 210 citations

• Physics
• Astrophysics
• Astronomy

. 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.

Early Release Science of the exoplanet WASP-39b with JWST NIRCam

Nature · 2023 · 180 citations

• Physics
• Astrophysics
• Astronomy

).

Early Release Science of the exoplanet WASP-39b with JWST NIRSpec G395H

Nature · 2023 · 245 citations

• Physics
• Astrophysics
• Astronomy

.

Identification of carbon dioxide in an exoplanet atmosphere

Nature · 2022 · 184 citations

• Astrobiology
• Environmental science
• Chemistry

, but little methane. Furthermore, we also tentatively detect a small absorption feature near 4.0 micrometres that is not reproduced by these models.