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Author Ahrer, E.M.; Alderson, L.; Batalha, N.M.; Batalha, N.E.; Bean, J.L.; Beatty, T.G.; Bell, T.J.; Benneke, B.; Berta-Thompson, Z.K.; Carter, A.L.; Crossfield, I.J.M.; Espinoza, N.; Feinstein, A.D.; Fortney, J.J.; Gibson, N.P.; Goyal, J.M.; Kempton, E.M.R.; Kirk, J.; Kreidberg, L.; Lopez-Morales, M.; Line, M.R.; Lothringer, J.D.; Moran, S.E.; Mukherjee, S.; Ohno, K.; Parmentier, V.; Piaulet, C.; Rustamkulov, Z.; Schlawin, E.; Sing, D.K.; Stevenson, K.B.; Wakeford, H.R.; Allen, N.H.; Birkmann, S.M.; Brande, J.; Crouzet, N.; Cubillos, P.E.; Damiano, M.; Desert, J.M.; Gao, P.; Harrington, J.; Hu, R.Y.; Kendrew, S.; Knutson, H.A.; Lagage, P.O.; Leconte, J.; Lendl, M.; MacDonald, R.J.; May, E.M.; Miguel, Y.; Molaverdikhani, K.; Moses, J.I.; Murray, C.A.; Nehring, M.; Nikolov, N.K.; de la Roche, D.J.M.P.D.; Radica, M.; Roy, P.A.; Stassun, K.G.; Taylor, J.; Waalkes, W.C.; Wachiraphan, P.; Welbanks, L.; Wheatley, P.J.; Aggarwal, K.; Alam, M.K.; Banerjee, A.; Barstow, J.K.; Blecic, J.; Casewell, S.L.; Changeat, Q.; Chubb, K.L.; Colon, K.D.; Coulombe, L.P.; Daylan, T.; De Val-Borro, M.; Decin, L.; Dos Santos, L.A.; Flagg, L.; France, K.; Fu, G.W.; Munoz, A.G.; Gizis, J.E.; Glidden, A.; Grant, D.; Heng, K.; Henning, T.; Hong, Y.C.; Inglis, J.; Iro, N.; Kataria, T.; Komacek, T.D.; Krick, J.E.; Lee, E.K.H.; Lewis, N.K.; Lillo-Box, J.; Lustig-Yaeger, J.; Mancini, L.; Mandell, A.M.; Mansfield, M.; Marley, M.S.; Mikal-Evans, T.; Morello, G.; Nixon, M.C.; Ceballos, K.O.; Piette, A.A.A.; Powell, D.; Rackham, B.V.; Ramos-Rosado, L.; Rauscher, E.; Redfield, S.; Rogers, L.K.; Roman, M.T.; Roudier, G.M.; Scarsdale, N.; Shkolnik, E.L.; Southworth, J.; Spake, J.J.; Steinrueck, M.E.; Tan, X.Y.; Teske, J.K.; Tremblin, P.; Tsai, S.M.; Tucker, G.S.; Turner, J.D.; Valenti, J.A.; Venot, O.; Waldmann, I.P.; Wallack, N.L.; Zhang, X.; Zieba, S.
Title Identification of carbon dioxide in an exoplanet atmosphere Type
Year 2023 Publication Nature Abbreviated Journal Nature
Volume Early Access Issue Pages
Keywords GIANT PLANETS; BROWN DWARFS; LINE LISTS; H2O; SKY
Abstract Carbon dioxide (CO2) is a key chemical species that is found in a wide range of planetary atmospheres. In the context of exoplanets, CO2 is an indicator of the metal enrichment (that is, elements heavier than helium, also called 'metallicity')(1-3), and thus the formation processes of the primary atmospheres of hot gas giants(4-6). It is also one of the most promising species to detect in the secondary atmospheres of terrestrial exoplanets(7-9). Previous photometric measurements of transiting planets with the Spitzer Space Telescope have given hints of the presence of CO2, but have not yielded definitive detections owing to the lack of unambiguous spectroscopic identification(10-12). Here we present the detection of CO2 in the atmosphere of the gas giant exoplanet WASP-39b from transmission spectroscopy observations obtained with JWST as part of the Early Release Science programme(13,14). The data used in this study span 3.0-5.5micrometres in wavelength and show a prominent CO2 absorption feature at 4.3micrometres (26-sigma significance). The overall spectrum is well matched by one-dimensional, ten-times solar metallicity models that assume radiative-convective-thermochemical equilibrium and have moderate cloud opacity. These models predict that the atmosphere should have water, carbon monoxide and hydrogen sulfide in addition to CO2, but little methane. Furthermore, we also tentatively detect a small absorption feature near 4.0micrometres that is not reproduced by these models.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0028-0836 ISBN Medium
Area Expedition Conference
Notes WOS:000927885000001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1760
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Author 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.
Title Early Release Science of the exoplanet WASP-39b with JWST NIRISS Type
Year 2023 Publication Nature Abbreviated Journal Nature
Volume Early Access Issue Pages
Keywords EXOMOL LINE LISTS; THERMAL STRUCTURE; MODEL; ABUNDANCES; ATMOSPHERE; RETRIEVAL; SCATTERING; EFFICIENT; SPECTRUM; METHANE
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.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0028-0836 ISBN Medium
Area Expedition Conference
Notes WOS:000951197700001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1800
Permanent link to this record