A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b

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dc.contributor.authorCoulombe, Louis-Philippe
dc.contributor.authorBenneke, Björn
dc.contributor.authorChallener, Ryan
dc.contributor.authorPiette, Anjali A. A.
dc.contributor.authorWiser, Lindsey S.
dc.contributor.authorMansfield, Megan
dc.contributor.authorMacDonald, Ryan J.
dc.contributor.authorBeltz, Hayley
dc.contributor.authorFeinstein, Adina D.
dc.contributor.authorRadica, Michael
dc.contributor.authorSavel, Arjun B.
dc.contributor.authorDos Santos, Leonardo A.
dc.contributor.authorBean, Jacob L.
dc.contributor.authorParmentier, Vivien
dc.contributor.authorWong, Ian
dc.contributor.authorRauscher, Emily
dc.contributor.authorKomacek, Thaddeus D.
dc.contributor.authorKempton, Eliza M.-R.
dc.contributor.authorTan, Xianyu
dc.contributor.authorHammond, Mark
dc.contributor.authorLewis, Neil T.
dc.contributor.authorLine, Michael R.
dc.contributor.authorLee, Elspeth K. H.
dc.contributor.authorShivkumar, Hinna
dc.contributor.authorCrossfield, Ian J. M.
dc.contributor.authorNixon, Matthew C.
dc.contributor.authorRackham, Benjamin V.
dc.contributor.authorWakeford, Hannah R.
dc.contributor.authorWelbanks, Luis
dc.contributor.authorZhang, Xi
dc.contributor.authorBatalha, Natalie M.
dc.contributor.authorBerta-Thompson, Zachory K.
dc.contributor.authorChangeat, Quentin
dc.contributor.authorDésert, Jean-Michel
dc.contributor.authorEspinoza, Néstor
dc.contributor.authorGoyal, Jayesh M.
dc.contributor.authorHarrington, Joseph
dc.contributor.authorKnutson, Heather A.
dc.contributor.authorKreidberg, Laura
dc.contributor.authorLópez-Morales, Mercedes
dc.contributor.authorShporer, Avi
dc.contributor.authorSing, David K.
dc.contributor.authorStevenson, Kevin B.
dc.contributor.authorAggarwal, Keshav
dc.contributor.authorAhrer, Eva-Maria
dc.contributor.authorAlam, Munazza K.
dc.contributor.authorBell, Taylor J.
dc.contributor.authorBlecic, Jasmina
dc.contributor.authorCaceres, Claudio
dc.contributor.authorCarter, Aarynn L.
dc.contributor.authorCasewell, Sarah L.
dc.contributor.authorCrouzet, Nicolas
dc.contributor.authorCubillos, Patricio E.
dc.contributor.authorDecin, Leen
dc.contributor.authorFortney, Jonathan J.
dc.contributor.authorGibson, Neale P.
dc.contributor.authorHeng, Kevin
dc.contributor.authorHenning, Thomas
dc.contributor.authorIro, Nicolas
dc.contributor.authorKendrew, Sarah
dc.contributor.authorLagage, Pierre-Olivier
dc.contributor.authorLeconte, Jérémy
dc.contributor.authorLendl, Monika
dc.contributor.authorLothringer, Joshua D.
dc.contributor.authorMancini, Luigi
dc.contributor.authorMikal-Evans, Thomas
dc.contributor.authorMolaverdikhani, Karan
dc.contributor.authorNikolov, Nikolay K.
dc.contributor.authorOhno, Kazumasa
dc.contributor.authorPalle, Enric
dc.contributor.authorPiaulet, Caroline
dc.contributor.authorRedfield, Seth
dc.contributor.authorRoy, Pierre-Alexis
dc.contributor.authorTsai, Shang-Min
dc.contributor.authorVenot, Olivia
dc.contributor.authorWheatley, Peter J.
dc.date.accessioned2025-04-09T22:22:52Z
dc.date.available2025-04-09T22:22:52Z
dc.date.issued2023-08
dc.descriptionIndexación: Scopus
dc.description.abstractClose-in giant exoplanets with temperatures greater than 2,000 K (‘ultra-hot Jupiters’) have been the subject of extensive efforts to determine their atmospheric properties using thermal emission measurements from the Hubble Space Telescope (HST) and Spitzer Space Telescope 1–3. However, previous studies have yielded inconsistent results because the small sizes of the spectral features and the limited information content of the data resulted in high sensitivity to the varying assumptions made in the treatment of instrument systematics and the atmospheric retrieval analysis 3–12. Here we present a dayside thermal emission spectrum of the ultra-hot Jupiter WASP-18b obtained with the NIRISS 13 instrument on the JWST. The data span 0.85 to 2.85 μm in wavelength at an average resolving power of 400 and exhibit minimal systematics. The spectrum shows three water emission features (at >6σ confidence) and evidence for optical opacity, possibly attributable to H−, TiO and VO (combined significance of 3.8σ). Models that fit the data require a thermal inversion, molecular dissociation as predicted by chemical equilibrium, a solar heavy-element abundance (‘metallicity’, M/H=1.03−0.51+1.11 times solar) and a carbon-to-oxygen (C/O) ratio less than unity. The data also yield a dayside brightness temperature map, which shows a peak in temperature near the substellar point that decreases steeply and symmetrically with longitude towards the terminators. © 2023, The Author(s).
dc.description.urihttps://www-nature-com.recursosbiblioteca.unab.cl/articles/s41586-023-06230-1
dc.identifier.citationNature. Volume 620, Issue 7973, Pages 292 - 298. 10 August 2023
dc.identifier.doi10.1038/s41586-023-06230-1
dc.identifier.issn0028-0836
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/64103
dc.language.isoen
dc.publisherNature Research
dc.rights.licenseAttribution 4.0 International Deed (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectAtmosphere
dc.subjectExtraterrestrial Environment
dc.subjectJupiter
dc.subjectOxygen
dc.subjectTemperature
dc.subjectUltra-hot Jupiter WASP-18b
dc.subjectThermal Emission
dc.titleA broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b
dc.typeArtículo
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