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A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b.
Coulombe, Louis-Philippe; Benneke, Björn; Challener, Ryan; Piette, Anjali A A; Wiser, Lindsey S; Mansfield, Megan; MacDonald, Ryan J; Beltz, Hayley; Feinstein, Adina D; Radica, Michael; Savel, Arjun B; Dos Santos, Leonardo A; Bean, Jacob L; Parmentier, Vivien; Wong, Ian; Rauscher, Emily; Komacek, Thaddeus D; Kempton, Eliza M-R; Tan, Xianyu; Hammond, Mark; Lewis, Neil T; Line, Michael R; Lee, Elspeth K H; Shivkumar, Hinna; Crossfield, Ian J M; Nixon, Matthew C; Rackham, Benjamin V; Wakeford, Hannah R; Welbanks, Luis; Zhang, Xi; Batalha, Natalie M; Berta-Thompson, Zachory K; Changeat, Quentin; Désert, Jean-Michel; Espinoza, Néstor; Goyal, Jayesh M; Harrington, Joseph; Knutson, Heather A; Kreidberg, Laura; López-Morales, Mercedes; Shporer, Avi; Sing, David K; Stevenson, Kevin B; Aggarwal, Keshav; Ahrer, Eva-Maria; Alam, Munazza K; Bell, Taylor J; Blecic, Jasmina; Caceres, Claudio; Carter, Aarynn L.
  • Coulombe LP; Department of Physics, Université de Montréal, Montréal, Quebec, Canada. louis-philippe.coulombe@umontreal.ca.
  • Benneke B; Trottier Institute for Research on Exoplanets, Université de Montréal, Montréal, Quebec, Canada. louis-philippe.coulombe@umontreal.ca.
  • Challener R; Department of Physics, Université de Montréal, Montréal, Quebec, Canada.
  • Piette AAA; Trottier Institute for Research on Exoplanets, Université de Montréal, Montréal, Quebec, Canada.
  • Wiser LS; Department of Astronomy, University of Michigan, Ann Arbor, MI, USA.
  • Mansfield M; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC, USA.
  • MacDonald RJ; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA.
  • Beltz H; Steward Observatory, University of Arizona, Tucson, AZ, USA.
  • Feinstein AD; Department of Astronomy, University of Michigan, Ann Arbor, MI, USA.
  • Radica M; Department of Astronomy, Cornell University, Ithaca, NY, USA.
  • Savel AB; Carl Sagan Institute, Cornell University, Ithaca, NY, USA.
  • Dos Santos LA; Department of Astronomy, University of Michigan, Ann Arbor, MI, USA.
  • Bean JL; Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL, USA.
  • Parmentier V; Department of Physics, Université de Montréal, Montréal, Quebec, Canada.
  • Wong I; Trottier Institute for Research on Exoplanets, Université de Montréal, Montréal, Quebec, Canada.
  • Rauscher E; Department of Astronomy, University of Maryland, College Park, MD, USA.
  • Komacek TD; Center for Computational Astrophysics, Flatiron Institute, New York, NY, USA.
  • Kempton EM; Space Telescope Science Institute, Baltimore, MD, USA.
  • Tan X; Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL, USA.
  • Hammond M; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France.
  • Lewis NT; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Line MR; Department of Astronomy, University of Michigan, Ann Arbor, MI, USA.
  • Lee EKH; Department of Astronomy, University of Maryland, College Park, MD, USA.
  • Shivkumar H; Department of Astronomy, University of Maryland, College Park, MD, USA.
  • Crossfield IJM; Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
  • Nixon MC; School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
  • Rackham BV; Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford, UK.
  • Wakeford HR; Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford, UK.
  • Welbanks L; Department of Mathematics and Statistics, Faculty of Environment, Science and Economy, University of Exeter, Exeter, UK.
  • Zhang X; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA.
  • Batalha NM; Center for Space and Habitability, University of Bern, Bern, Switzerland.
  • Berta-Thompson ZK; Anton Pannekoek Institute for Astronomy, University of Amsterdam, Amsterdam, The Netherlands.
  • Changeat Q; Department of Physics & Astronomy, University of Kansas, Lawrence, KS, USA.
  • Désert JM; Department of Astronomy, University of Maryland, College Park, MD, USA.
  • Espinoza N; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Goyal JM; Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Harrington J; School of Physics, University of Bristol, Bristol, UK.
  • Knutson HA; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA.
  • Kreidberg L; Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA, USA.
  • López-Morales M; Department of Astronomy and Astrophysics, University of California, Santa Cruz, Santa Cruz, CA, USA.
  • Shporer A; Department of Astrophysical and Planetary Sciences, University of Colorado Boulder, Boulder, CO, USA.
  • Sing DK; European Space Agency, Space Telescope Science Institute, Baltimore, MD, USA.
  • Stevenson KB; Department of Physics and Astronomy, University College London, London, UK.
  • Aggarwal K; Anton Pannekoek Institute for Astronomy, University of Amsterdam, Amsterdam, The Netherlands.
  • Ahrer EM; Space Telescope Science Institute, Baltimore, MD, USA.
  • Alam MK; School of Earth and Planetary Sciences (SEPS), National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Jatni, India.
  • Bell TJ; Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, FL, USA.
  • Blecic J; Florida Space Institute, University of Central Florida, Orlando, FL, USA.
  • Caceres C; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.
  • Carter AL; Max Planck Institute for Astronomy, Heidelberg, Germany.
Nature ; 620(7973): 292-298, 2023 Aug.
Article en En | MEDLINE | ID: mdl-37257843
ABSTRACT
Close-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 Telescope1-3. 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 analysis3-12. Here we present a dayside thermal emission spectrum of the ultra-hot Jupiter WASP-18b obtained with the NIRISS13 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', [Formula see text] 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.
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Texto completo: 1 Banco de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Año: 2023 Tipo del documento: Article
Texto completo
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XML
PubMed Links
Search on Google

Texto completo: 1 Banco de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Año: 2023 Tipo del documento: Article