JWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy
We present the first emission spectrum of the hot Jupiter WASP-17 b using one eclipse observation from the JWST Near Infrared Imager and Slitless Spectrograph (NIRISS) Single Object Slitless Spectroscopy (SOSS) mode. Covering a wavelength range of 0.6–2.8 μ m, our retrieval analysis reveals a strong...
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2025-01-01
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| author | Amélie Gressier Ryan J. MacDonald Néstor Espinoza Hannah R. Wakeford Nikole K. Lewis Jayesh Goyal Dana R. Louie Michael Radica Natasha E. Batalha Douglas Long Erin M. May Elijah Mullens Sara Seager Kevin B. Stevenson Jeff A. Valenti Lili Alderson Natalie H. Allen Caleb I. Cañas Ryan C. Challener Knicole Colón Ana Glidden David Grant Jingcheng Huang Zifan Lin Daniel Valentine C. Matt Mountain Laurent Pueyo Marshall D. Perrin Roeland P. van der Marel |
| author_facet | Amélie Gressier Ryan J. MacDonald Néstor Espinoza Hannah R. Wakeford Nikole K. Lewis Jayesh Goyal Dana R. Louie Michael Radica Natasha E. Batalha Douglas Long Erin M. May Elijah Mullens Sara Seager Kevin B. Stevenson Jeff A. Valenti Lili Alderson Natalie H. Allen Caleb I. Cañas Ryan C. Challener Knicole Colón Ana Glidden David Grant Jingcheng Huang Zifan Lin Daniel Valentine C. Matt Mountain Laurent Pueyo Marshall D. Perrin Roeland P. van der Marel |
| author_sort | Amélie Gressier |
| collection | DOAJ |
| description | We present the first emission spectrum of the hot Jupiter WASP-17 b using one eclipse observation from the JWST Near Infrared Imager and Slitless Spectrograph (NIRISS) Single Object Slitless Spectroscopy (SOSS) mode. Covering a wavelength range of 0.6–2.8 μ m, our retrieval analysis reveals a strong detection of H _2 O in WASP-17 b’s dayside atmosphere (6.4 σ ). Our retrievals consistently favor a supersolar dayside H _2 O abundance and a noninverted temperature–pressure profile over a large pressure range. Additionally, our examination of the brightness temperature reveals excess emission below 1 μ m, suggesting the possibility of a high internal temperature (600–700 K) and/or contributions from reflected light. We highlight that JWST emission spectroscopy retrieval results can be sensitive to whether negative eclipse depths are allowed at optical wavelengths during light-curve fitting. Our findings deepen our understanding of WASP-17 b’s atmospheric composition while also highlighting the sensitivity of our results to pressure–temperature profile parameterizations. This work is part of a series of studies by our JWST Telescope Scientist Team (TST), in which we will use Guaranteed Time Observations to perform Deep Reconnaissance of Exoplanet Atmospheres through Multi-instrument Spectroscopy (DREAMS). |
| format | Article |
| id | doaj-art-8b086ba8508a4f1eb525d8e6c6e1ddf4 |
| institution | OA Journals |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astronomical Journal |
| spelling | doaj-art-8b086ba8508a4f1eb525d8e6c6e1ddf42025-08-20T02:08:15ZengIOP PublishingThe Astronomical Journal1538-38812025-01-0116925710.3847/1538-3881/ad97bfJWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse SpectroscopyAmélie Gressier0https://orcid.org/0000-0003-0854-3002Ryan J. MacDonald1https://orcid.org/0000-0003-4816-3469Néstor Espinoza2https://orcid.org/0000-0001-9513-1449Hannah R. Wakeford3https://orcid.org/0000-0003-4328-3867Nikole K. Lewis4https://orcid.org/0000-0002-8507-1304Jayesh Goyal5https://orcid.org/0000-0002-8515-7204Dana R. Louie6https://orcid.org/0000-0002-2457-272XMichael Radica7https://orcid.org/0000-0002-3328-1203Natasha E. Batalha8https://orcid.org/0000-0003-1240-6844Douglas Long9https://orcid.org/0000-0002-2508-9211Erin M. May10https://orcid.org/0000-0002-2739-1465Elijah Mullens11https://orcid.org/0000-0003-0814-7923Sara Seager12https://orcid.org/0000-0002-6892-6948Kevin B. Stevenson13https://orcid.org/0000-0002-7352-7941Jeff A. Valenti14https://orcid.org/0000-0003-3305-6281Lili Alderson15https://orcid.org/0000-0001-8703-7751Natalie H. Allen16https://orcid.org/0000-0002-0832-710XCaleb I. Cañas17https://orcid.org/0000-0003-4835-0619Ryan C. Challener18https://orcid.org/0000-0002-8211-6538Knicole Colón19https://orcid.org/0000-0001-8020-7121Ana Glidden20https://orcid.org/0000-0002-5322-2315David Grant21https://orcid.org/0000-0001-5878-618XJingcheng Huang22https://orcid.org/0000-0001-5732-8531Zifan Lin23https://orcid.org/0000-0003-0525-9647Daniel Valentine24https://orcid.org/0000-0002-2643-6836C. Matt Mountain25Laurent Pueyo26Marshall D. Perrin27https://orcid.org/0000-0002-3191-8151Roeland P. van der Marel28https://orcid.org/0000-0001-7827-7825Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; agressier@stsci.eduDepartment of Astronomy, University of Michigan , 1085 S. University Avenue, Ann Arbor, MI 48109, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; agressier@stsci.edu; William H. Miller III Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USAUniversity of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UKDepartment of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USASchool of Earth and Planetary Sciences (SEPS), National Institute of Science Education and Research (NISER) , HBNI, Odisha, IndiaCatholic University of America , Department of Physics, Washington, DC 20064, USA; Exoplanets and Stellar Astrophysics Laboratory (Code 667), NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; Center for Research and Exploration in Space Science and Technology II , NASA/GSFC, Greenbelt, MD 20771, USAInstitut Trottier de recherche sur les exoplanètes and Département de Physique, Université de Montréal , 1375 Avenue Thérèse-Lavoie-Roux, Montréal, QC H2V 0B3, CanadaNASA Ames Research Center , Moffett Field, CA 94035, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; agressier@stsci.eduJohns Hopkins APL , 11100 Johns Hopkins Road, Laurel, MD 20723, USADepartment of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USADepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Aeronautics and Astronautics, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139, USAJohns Hopkins APL , 11100 Johns Hopkins Road, Laurel, MD 20723, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; agressier@stsci.eduUniversity of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UKWilliam H. Miller III Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USANASA Goddard Space Flight Center , Greenbelt, MD 20771, USADepartment of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USANASA Goddard Space Flight Center , Greenbelt, MD 20771, USADepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USAUniversity of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UKDepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USADepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USAUniversity of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UKAssociation of Universities for Research in Astronomy , 1331 Pennsylvania Avenue NW Suite 1475, Washington, DC 20004, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; agressier@stsci.eduSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; agressier@stsci.eduSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; agressier@stsci.edu; William H. Miller III Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USAWe present the first emission spectrum of the hot Jupiter WASP-17 b using one eclipse observation from the JWST Near Infrared Imager and Slitless Spectrograph (NIRISS) Single Object Slitless Spectroscopy (SOSS) mode. Covering a wavelength range of 0.6–2.8 μ m, our retrieval analysis reveals a strong detection of H _2 O in WASP-17 b’s dayside atmosphere (6.4 σ ). Our retrievals consistently favor a supersolar dayside H _2 O abundance and a noninverted temperature–pressure profile over a large pressure range. Additionally, our examination of the brightness temperature reveals excess emission below 1 μ m, suggesting the possibility of a high internal temperature (600–700 K) and/or contributions from reflected light. We highlight that JWST emission spectroscopy retrieval results can be sensitive to whether negative eclipse depths are allowed at optical wavelengths during light-curve fitting. Our findings deepen our understanding of WASP-17 b’s atmospheric composition while also highlighting the sensitivity of our results to pressure–temperature profile parameterizations. This work is part of a series of studies by our JWST Telescope Scientist Team (TST), in which we will use Guaranteed Time Observations to perform Deep Reconnaissance of Exoplanet Atmospheres through Multi-instrument Spectroscopy (DREAMS).https://doi.org/10.3847/1538-3881/ad97bfExoplanet atmospheresExoplanet atmospheric compositionTransmission spectroscopyHot JupitersAstronomy data reduction |
| spellingShingle | Amélie Gressier Ryan J. MacDonald Néstor Espinoza Hannah R. Wakeford Nikole K. Lewis Jayesh Goyal Dana R. Louie Michael Radica Natasha E. Batalha Douglas Long Erin M. May Elijah Mullens Sara Seager Kevin B. Stevenson Jeff A. Valenti Lili Alderson Natalie H. Allen Caleb I. Cañas Ryan C. Challener Knicole Colón Ana Glidden David Grant Jingcheng Huang Zifan Lin Daniel Valentine C. Matt Mountain Laurent Pueyo Marshall D. Perrin Roeland P. van der Marel JWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy The Astronomical Journal Exoplanet atmospheres Exoplanet atmospheric composition Transmission spectroscopy Hot Jupiters Astronomy data reduction |
| title | JWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy |
| title_full | JWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy |
| title_fullStr | JWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy |
| title_full_unstemmed | JWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy |
| title_short | JWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy |
| title_sort | jwst tst dreams a supersolar metallicity in wasp 17 b s dayside atmosphere from niriss soss eclipse spectroscopy |
| topic | Exoplanet atmospheres Exoplanet atmospheric composition Transmission spectroscopy Hot Jupiters Astronomy data reduction |
| url | https://doi.org/10.3847/1538-3881/ad97bf |
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