Transmission spectroscopy1-3 of exoplanets has revealed signatures of water vapour, aerosols and alkali metals in a few dozen exoplanet atmospheres4,5. However, these previous inferences with the Hubble and Spitzer Space Telescopes were hindered by the observations' relatively narrow wavelength range and spectral resolving power, which precluded the unambiguous identification of other chemical species-in particular the primary carbon-bearing molecules6,7. Here we report a broad-wavelength 0.5-5.5 µm atmospheric transmission spectrum of WASP-39b8, a 1,200 K, roughly Saturn-mass, Jupiter-radius exoplanet, measured with the JWST NIRSpec's PRISM mode9 as part of the JWST Transiting Exoplanet Community Early Release Science Team Program10-12. We robustly detect several chemical species at high significance, including Na (19σ), H2O (33σ), CO2 (28σ) and CO (7σ). The non-detection of CH4, combined with a strong CO2 feature, favours atmospheric models with a super-solar atmospheric metallicity. An unanticipated absorption feature at 4 µm is best explained by SO2 (2.7σ), which could be a tracer of atmospheric photochemistry. These observations demonstrate JWST's sensitivity to a rich diversity of exoplanet compositions and chemical processes.

Rustamkulov, Z., Sing, D.k., Mukherjee, S., May, E.m., Kirk, J., Schlawin, E., et al. (2023). Early Release Science of the exoplanet WASP-39b with JWST NIRSpec PRISM. NATURE, 614(7949), 659-663 [10.1038/s41586-022-05677-y].

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

Mancini, L;
2023-02-01

Abstract

Transmission spectroscopy1-3 of exoplanets has revealed signatures of water vapour, aerosols and alkali metals in a few dozen exoplanet atmospheres4,5. However, these previous inferences with the Hubble and Spitzer Space Telescopes were hindered by the observations' relatively narrow wavelength range and spectral resolving power, which precluded the unambiguous identification of other chemical species-in particular the primary carbon-bearing molecules6,7. Here we report a broad-wavelength 0.5-5.5 µm atmospheric transmission spectrum of WASP-39b8, a 1,200 K, roughly Saturn-mass, Jupiter-radius exoplanet, measured with the JWST NIRSpec's PRISM mode9 as part of the JWST Transiting Exoplanet Community Early Release Science Team Program10-12. We robustly detect several chemical species at high significance, including Na (19σ), H2O (33σ), CO2 (28σ) and CO (7σ). The non-detection of CH4, combined with a strong CO2 feature, favours atmospheric models with a super-solar atmospheric metallicity. An unanticipated absorption feature at 4 µm is best explained by SO2 (2.7σ), which could be a tracer of atmospheric photochemistry. These observations demonstrate JWST's sensitivity to a rich diversity of exoplanet compositions and chemical processes.
feb-2023
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Astrophysics - Earth and Planetary Astrophysics
Astrophysics - Instrumentation and Methods for Astrophysics
Astrophysics - Solar and Stellar Astrophysics
Rustamkulov, Z., Sing, D.k., Mukherjee, S., May, E.m., Kirk, J., Schlawin, E., et al. (2023). Early Release Science of the exoplanet WASP-39b with JWST NIRSpec PRISM. NATURE, 614(7949), 659-663 [10.1038/s41586-022-05677-y].
Rustamkulov, Z; Sing, Dk; Mukherjee, S; May, Em; Kirk, J; Schlawin, E; Line, Mr; Piaulet, C; Carter, Al; Batalha, Ne; Goyal, Jm; López-Morales, M; Lothringer, Jd; Macdonald, Rj; Moran, Se; Stevenson, Kb; Wakeford, Hr; Espinoza, N; Bean, Jl; Batalha, Nm; Benneke, B; Berta-Thompson, Zk; Crossfield, Ijm; Gao, P; Kreidberg, L; Powell, Dk; Cubillos, Pe; Gibson, Np; Leconte, J; Molaverdikhani, K; Nikolov, Nk; Parmentier, V; Roy, P; Taylor, J; Turner, Jd; Wheatley, Pj; Aggarwal, K; Ahrer, E; Alam, Mk; Alderson, L; Allen, Nh; Banerjee, A; Barat, S; Barrado, D; Barstow, Jk; Bell, Tj; Blecic, J; Brande, J; Casewell, S; Changeat, Q; Chubb, Kl; Crouzet, N; Daylan, T; Decin, L; Désert, J; Mikal-Evans, T; Feinstein, Ad; Flagg, L; Fortney, Jj; Harrington, J; Heng, K; Hong, Y; Hu, R; Iro, N; Kataria, T; Kempton, Em; Krick, J; Lendl, M; Lillo-Box, J; Louca, A; Lustig-Yaeger, J; Mancini, L; Mansfield, M; Mayne, Nj; Miguel, Y; Morello, G; Ohno, K; Palle, E; Petit Dit de la Roche, Djm; Rackham, Bv; Radica, M; Ramos-Rosado, L; Redfield, S; Rogers, Lk; Shkolnik, El; Southworth, J; Teske, J; Tremblin, P; Tucker, Gs; Venot, O; Waalkes, Wc; Welbanks, L; Zhang, X; Zieba, S
Articolo su rivista
File in questo prodotto:
File Dimensione Formato  
s41586-022-05677-y.pdf

accesso aperto

Tipologia: Versione Editoriale (PDF)
Licenza: Creative commons
Dimensione 25.6 MB
Formato Adobe PDF
25.6 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/316795
Citazioni
  • ???jsp.display-item.citation.pmc??? 7
  • Scopus 99
  • ???jsp.display-item.citation.isi??? 89
social impact