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Feinstein, A.D.; Radica, M.; Welbanks, L.; Murray, C.A.; Ohno, K.; Coulombe, L.P.; Espinoza, N.; Bean, J.L.; Teske, J.K.; Benneke, B.; Line, M.R.; Rustamkulov, Z.; Saba, A.; Tsiaras, A.; Barstow, J.K.; Fortney, J.J.; Gao, P.T.; Knutson, H.A.; MacDonald, R.J.; Mikal-Evans, T.; Rackham, B.V.; Taylor, J.; Parmentier, V.; Batalha, N.M.; Berta-Thompson, Z.K.; Carter, A.L.; Changeat, Q.; dos Santos, L.A.; Gibson, N.P.; Goyal, J.M.; Kreidberg, L.; Lopez-Morales, M.; Lothringer, J.D.; Miguel, Y.; Molaverdikhani, K.; Moran, S.E.; Morello, G.; Mukherjee, S.; Sing, D,.K.; Stevenson, K.B.; Wakeford, H.R.; Ahrer, E.M.; Alam, M.K.; Alderson, L.; Allen, N.H.; Batalha, N.E.; Bell, T.J.; Blecic, J.; Brande, J.; Caceres, C.; Casewell, S.L.; Chubb, K.L.; Crossfield, I.J.M.; Crouzet, N.; Cubillos, P.E.; Decin, L.; Desert, J.M.; Harrington, J.; Heng, K.V.; Henning, T.; Iro, N.; Kempton, E.M.R.; Kendrew, S.; Kirk, J.; Krick, J.; Lagage, P.O.; Lendl, M.; Mancini, L.; Mansfield, M.; May, E.M.; Mayne, N.J.; Nikolov, N.K.; Palle, E.; de la Roche, D.J.M.P.D.; Piaulet, C.; Powell, D.; Redfield, S.; Rogers, L.K.; Roman, M.T.; Roy, P.A.; Nixon, M.C.; Schlawin, E.; Tan, X.Y.; Tremblin, P.; Turner, J.D.; Venot, O.; Waalkes, W.C.; Wheatley, P.J.; Zhang, X. |
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Early Release Science of the exoplanet WASP-39b with JWST NIRISS |
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2023 |
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Nature |
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Nature |
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Early Access |
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EXOMOL LINE LISTS; THERMAL STRUCTURE; MODEL; ABUNDANCES; ATMOSPHERE; RETRIEVAL; SCATTERING; EFFICIENT; SPECTRUM; METHANE |
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Abstract |
The Saturn-mass exoplanet WASP-39b has been the subject of extensive efforts to determine its atmospheric properties using transmission spectroscopy(1-4). However, these efforts have been hampered by modelling degeneracies between composition and cloud properties that are caused by limited data quality(5-9). 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 mu m 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. |
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0028-0836 |
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WOS:000951197700001 |
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UAI @ alexi.delcanto @ |
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1800 |
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