TY - JOUR
T1 - Early Release Science of the exoplanet WASP-39b with JWST NIRISS
AU - NIRISS
AU - Feinstein, Adina D.
AU - Radica, Michael
AU - Welbanks, Luis
AU - Murray, Catriona Anne
AU - Ohno, Kazumasa
AU - Coulombe, Louis Philippe
AU - Espinoza, Néstor
AU - Bean, Jacob L.
AU - Teske, Johanna K.
AU - Benneke, Björn
AU - Line, Michael R.
AU - Rustamkulov, Zafar
AU - Saba, Arianna
AU - Tsiaras, Angelos
AU - Barstow, Joanna K.
AU - Fortney, Jonathan J.
AU - Gao, Peter
AU - Knutson, Heather A.
AU - MacDonald, Ryan J.
AU - Mikal-Evans, Thomas
AU - Rackham, Benjamin V.
AU - Taylor, Jake
AU - Parmentier, Vivien
AU - Batalha, Natalie M.
AU - Berta-Thompson, Zachory K.
AU - Carter, Aarynn L.
AU - Changeat, Quentin
AU - dos Santos, Leonardo A.
AU - Gibson, Neale P.
AU - Goyal, Jayesh M.
AU - Kreidberg, Laura
AU - López-Morales, Mercedes
AU - Lothringer, Joshua D.
AU - Miguel, Yamila
AU - Molaverdikhani, Karan
AU - Moran, Sarah E.
AU - Morello, Giuseppe
AU - Mukherjee, Sagnick
AU - Sing, David K.
AU - Stevenson, Kevin B.
AU - Wakeford, Hannah R.
AU - Ahrer, Eva Maria
AU - Alam, Munazza K.
AU - Alderson, Lili
AU - Allen, Natalie H.
AU - Batalha, Natasha E.
AU - Bell, Taylor J.
AU - Blecic, Jasmina
AU - Brande, Jonathan
AU - Caceres, Claudio
N1 - © 2023. The Author(s).
PY - 2023/2/23
Y1 - 2023/2/23
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85146867206&partnerID=8YFLogxK
U2 - 10.1038/s41586-022-05674-1
DO - 10.1038/s41586-022-05674-1
M3 - Article
C2 - 36623550
AN - SCOPUS:85146867206
SN - 0028-0836
VL - 614
SP - 670
EP - 675
JO - Nature
JF - Nature
IS - 7949
ER -