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

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posted on 2024-01-24, 16:27 authored by Z Rustamkulov, DK Sing, S Mukherjee, EM May, J Kirk, E Schlawin, MR Line, C Piaulet, AL Carter, NE Batalha, JM Goyal, M López-Morales, JD Lothringer, RJ MacDonald, SE Moran, KB Stevenson, HR Wakeford, N Espinoza, JL Bean, NM Batalha, B Benneke, ZK Berta-Thompson, IJM Crossfield, P Gao, L Kreidberg, DK Powell, PE Cubillos, NP Gibson, J Leconte, K Molaverdikhani, NK Nikolov, V Parmentier, P Roy, J Taylor, JD Turner, PJ Wheatley, K Aggarwal, E Ahrer, MK Alam, L Alderson, NH Allen, A Banerjee, S Barat, D Barrado, JK Barstow, TJ Bell, J Blecic, J Brande, S Casewell, Q Changeat, KL Chubb, N Crouzet, T Daylan, L Decin, J Désert, T Mikal-Evans, AD Feinstein, L Flagg, JJ Fortney, J Harrington, K Heng, Y Hong, R Hu, N Iro, T Kataria, EMR Kempton, J Krick, M Lendl, J Lillo-Box, A Louca, J Lustig-Yaeger, L Mancini, M Mansfield, NJ Mayne, Y Miguel, G Morello, K Ohno, E Palle, DJM Petit dit de la Roche, BV Rackham, M Radica, L Ramos-Rosado, S Redfield, LK Rogers, EL Shkolnik, J Southworth, J Teske, P Tremblin, GS Tucker, O Venot, WC Waalkes, L Welbanks, X Zhang, S Zieba

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.

History

Author affiliation

School of Physics & Astronomy, University of Leicester

Version

  • VoR (Version of Record)

Published in

Nature

Volume

614

Pagination

659-663

Publisher

Springer Science and Business Media LLC

issn

0028-0836

eissn

1476-4687

Copyright date

2023

Available date

2024-01-24

Spatial coverage

England

Language

eng

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