Feinstein, Adina D; Radica, Michael; Welbanks, Luis; Murray, Catriona Anne; Ohno, Kazumasa; Coulombe, Louis-Philippe; Espinoza, Néstor; Bean, Jacob L; Teske, Johanna K; Benneke, Björn; Line, Michael R; Rustamkulov, Zafar; Saba, Arianna; Tsiaras, Angelos; Barstow, Joanna K; Fortney, Jonathan J; Gao, Peter; Knutson, Heather A; MacDonald, Ryan J; Mikal-Evans, Thomas; ... (2023). Early Release Science of the exoplanet WASP-39b with JWST NIRISS. Nature, 614(7949), pp. 670-675. Springer Nature 10.1038/s41586-022-05674-1
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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-39 b obtained using the SOSS mode of the NIRISS instrument on JWST. This spectrum spans 0.6-2.8𝝻m in wavelength and reveals multiple 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 ~10-30x 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-gray clouds with inhomogeneous coverage of the planet's terminator.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research |
UniBE Contributor: |
Heng, Kevin |
Subjects: |
500 Science > 570 Life sciences; biology 600 Technology > 610 Medicine & health |
ISSN: |
1476-4687 |
Publisher: |
Springer Nature |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
12 Jan 2023 11:02 |
Last Modified: |
11 Jul 2023 00:25 |
Publisher DOI: |
10.1038/s41586-022-05674-1 |
PubMed ID: |
36623550 |
BORIS DOI: |
10.48350/177134 |
URI: |
https://boris.unibe.ch/id/eprint/177134 |
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