JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum
Water has proven to be ubiquitously detected in near-infrared (NIR) transmission spectroscopy observations of hot Jupiter atmospheres, including WASP-17b. However, previous analyses of WASP-17b’s atmosphere based upon Hubble Space Telescope (HST) and Spitzer data could not constrain the water abunda...
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| author | Dana R. Louie Elijah Mullens Lili Alderson Ana Glidden Nikole K. Lewis Hannah R. Wakeford Natasha E. Batalha Knicole D. Colón Amélie Gressier Douglas Long Michael Radica Néstor Espinoza Jayesh Goyal Ryan J. MacDonald Erin M. May Sara Seager Kevin B. Stevenson Jeff A. Valenti Natalie H. Allen Caleb I. Cañas Ryan C. Challener David Grant Jingcheng Huang Zifan Lin Daniel Valentine Mark Clampin Marshall Perrin Laurent Pueyo Roeland P. van der Marel C. Matt Mountain |
| author_facet | Dana R. Louie Elijah Mullens Lili Alderson Ana Glidden Nikole K. Lewis Hannah R. Wakeford Natasha E. Batalha Knicole D. Colón Amélie Gressier Douglas Long Michael Radica Néstor Espinoza Jayesh Goyal Ryan J. MacDonald Erin M. May Sara Seager Kevin B. Stevenson Jeff A. Valenti Natalie H. Allen Caleb I. Cañas Ryan C. Challener David Grant Jingcheng Huang Zifan Lin Daniel Valentine Mark Clampin Marshall Perrin Laurent Pueyo Roeland P. van der Marel C. Matt Mountain |
| author_sort | Dana R. Louie |
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| description | Water has proven to be ubiquitously detected in near-infrared (NIR) transmission spectroscopy observations of hot Jupiter atmospheres, including WASP-17b. However, previous analyses of WASP-17b’s atmosphere based upon Hubble Space Telescope (HST) and Spitzer data could not constrain the water abundance, finding that subsolar, supersolar, and bimodal posterior distributions were all statistically valid. In this work, we observe one transit of the hot Jupiter WASP-17b using JWST’s Near Infrared Imager and Slitless Spectrograph (NIRISS) Single Object Slitless Spectroscopy (SOSS) mode. We analyze our data using three independent data analysis pipelines, finding excellent agreement between results. Our transmission spectrum shows multiple H _2 O absorption features and a flatter slope towards the optical than seen in previous HST observations. We analyze our spectrum using both PICASO + Virga forward models and free retrievals. POSEIDON retrievals provide a well-constrained supersolar log(H _2 O) abundance (−2.96 ${}_{-0.24}^{+0.31}$ ), breaking the degeneracy from the previous HST + Spitzer analysis. We verify our POSEIDON results with petitRADTRANS retrievals. Additionally, we constrain the abundance of log(H ^− ), −10.19 ${}_{-0.23}^{+0.30}$ , finding that our model including H ^− is preferred over our model without H ^− to 5.1 σ . Furthermore, we constrain the log(K) abundance (−8.07 ${}_{-0.52}^{+0.58}$ ) in WASP-17b’s atmosphere for the first time using space-based observations. Our abundance constraints demonstrate the power of NIRISS SOSS’s increased resolution, precision, and wavelength range to improve upon previous NIR space-based results. This work is part of a series of studies by our JWST Telescope Scientist Team (JWST-TST), in which we use Guaranteed Time Observations to perform Deep Reconnaissance of Exoplanet Atmospheres through Multi-instrument Spectroscopy (DREAMS). |
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| spelling | doaj-art-b9b9f67fd1f149de898167fd6251bd3b2025-01-21T14:33:58ZengIOP PublishingThe Astronomical Journal1538-38812025-01-0116928610.3847/1538-3881/ad9688JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission SpectrumDana R. Louie0https://orcid.org/0000-0002-2457-272XElijah Mullens1https://orcid.org/0000-0003-0814-7923Lili Alderson2https://orcid.org/0000-0001-8703-7751Ana Glidden3https://orcid.org/0000-0002-5322-2315Nikole K. Lewis4https://orcid.org/0000-0002-8507-1304Hannah R. Wakeford5https://orcid.org/0000-0003-4328-3867Natasha E. Batalha6https://orcid.org/0000-0003-1240-6844Knicole D. Colón7https://orcid.org/0000-0001-8020-7121Amélie Gressier8https://orcid.org/0000-0003-0854-3002Douglas Long9https://orcid.org/0000-0002-2508-9211Michael Radica10https://orcid.org/0000-0002-3328-1203Néstor Espinoza11https://orcid.org/0000-0001-9513-1449Jayesh Goyal12https://orcid.org/0000-0002-8515-7204Ryan J. MacDonald13https://orcid.org/0000-0003-4816-3469Erin M. May14https://orcid.org/0000-0002-2739-1465Sara Seager15https://orcid.org/0000-0002-6892-6948Kevin B. Stevenson16https://orcid.org/0000-0002-7352-7941Jeff A. Valenti17https://orcid.org/0000-0003-3305-6281Natalie H. Allen18https://orcid.org/0000-0002-0832-710XCaleb I. Cañas19https://orcid.org/0000-0003-4835-0619Ryan C. Challener20https://orcid.org/0000-0002-8211-6538David Grant21https://orcid.org/0000-0001-5878-618XJingcheng Huang22https://orcid.org/0000-0001-5732-8531Zifan Lin23https://orcid.org/0000-0003-0525-9647Daniel Valentine24https://orcid.org/0000-0002-2643-6836Mark Clampin25Marshall Perrin26https://orcid.org/0000-0002-3191-8151Laurent Pueyo27Roeland P. van der Marel28https://orcid.org/0000-0001-7827-7825C. Matt Mountain29Catholic University of America , Department of Physics, Washington, DC 20064, USA ; dana.louie.astro21@gmail.com; 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, USADepartment of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USADepartment of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USA; University of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UKDepartment 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, USADepartment of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USAUniversity of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UKNASA Ames Research Center , MS 245-3, Moffett Field, CA 94035, USAExoplanets and Stellar Astrophysics Laboratory (Code 667), NASA Goddard Space Flight Center , Greenbelt, MD 20771, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USAInstitut Trottier de Recherche sur les Exoplanètes and Département de Physique, Université de Montréal , 1375 Avenue Thérèse-Lavoie-Roux, Montréal, QC H2V 0B3, Canada; Department of Astronomy & Astrophysics, University of Chicago , 5640 South Ellis Avenue, Chicago, IL 60637, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; William H. Miller III Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USASchool of Earth and Planetary Sciences (SEPS), National Institute of Science Education and Research (NISER) , HBNI, Odisha, IndiaDepartment of Astronomy, University of Michigan , 1085 S. University Avenue, Ann Arbor, MI 48109, USAJohns Hopkins University Applied Physics Laboratory , 11100 Johns Hopkins Road, Laurel, MD 20723, 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, Cambridge, MA 02139, USAJohns Hopkins University Applied Physics Laboratory , 11100 Johns Hopkins Road, Laurel, MD 20723, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USAWilliam H. Miller III Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USAExoplanets and Stellar Astrophysics Laboratory (Code 667), NASA Goddard Space Flight Center , Greenbelt, MD 20771, USADepartment of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, 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, UKNASA Headquarters, 300 E Street SW, Washington, DC 20546, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; William H. Miller III Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USAAssociation of Universities for Research in Astronomy, 1331 Pennsylvania Avenue NW Suite 1475, Washington, DC 20004, USAWater has proven to be ubiquitously detected in near-infrared (NIR) transmission spectroscopy observations of hot Jupiter atmospheres, including WASP-17b. However, previous analyses of WASP-17b’s atmosphere based upon Hubble Space Telescope (HST) and Spitzer data could not constrain the water abundance, finding that subsolar, supersolar, and bimodal posterior distributions were all statistically valid. In this work, we observe one transit of the hot Jupiter WASP-17b using JWST’s Near Infrared Imager and Slitless Spectrograph (NIRISS) Single Object Slitless Spectroscopy (SOSS) mode. We analyze our data using three independent data analysis pipelines, finding excellent agreement between results. Our transmission spectrum shows multiple H _2 O absorption features and a flatter slope towards the optical than seen in previous HST observations. We analyze our spectrum using both PICASO + Virga forward models and free retrievals. POSEIDON retrievals provide a well-constrained supersolar log(H _2 O) abundance (−2.96 ${}_{-0.24}^{+0.31}$ ), breaking the degeneracy from the previous HST + Spitzer analysis. We verify our POSEIDON results with petitRADTRANS retrievals. Additionally, we constrain the abundance of log(H ^− ), −10.19 ${}_{-0.23}^{+0.30}$ , finding that our model including H ^− is preferred over our model without H ^− to 5.1 σ . Furthermore, we constrain the log(K) abundance (−8.07 ${}_{-0.52}^{+0.58}$ ) in WASP-17b’s atmosphere for the first time using space-based observations. Our abundance constraints demonstrate the power of NIRISS SOSS’s increased resolution, precision, and wavelength range to improve upon previous NIR space-based results. This work is part of a series of studies by our JWST Telescope Scientist Team (JWST-TST), in which we use Guaranteed Time Observations to perform Deep Reconnaissance of Exoplanet Atmospheres through Multi-instrument Spectroscopy (DREAMS).https://doi.org/10.3847/1538-3881/ad9688Exoplanet atmospheresTransmission spectroscopyHot JupitersJames Webb Space TelescopeExoplanet atmospheric compositionAstronomy data analysis |
| spellingShingle | Dana R. Louie Elijah Mullens Lili Alderson Ana Glidden Nikole K. Lewis Hannah R. Wakeford Natasha E. Batalha Knicole D. Colón Amélie Gressier Douglas Long Michael Radica Néstor Espinoza Jayesh Goyal Ryan J. MacDonald Erin M. May Sara Seager Kevin B. Stevenson Jeff A. Valenti Natalie H. Allen Caleb I. Cañas Ryan C. Challener David Grant Jingcheng Huang Zifan Lin Daniel Valentine Mark Clampin Marshall Perrin Laurent Pueyo Roeland P. van der Marel C. Matt Mountain JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum The Astronomical Journal Exoplanet atmospheres Transmission spectroscopy Hot Jupiters James Webb Space Telescope Exoplanet atmospheric composition Astronomy data analysis |
| title | JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum |
| title_full | JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum |
| title_fullStr | JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum |
| title_full_unstemmed | JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum |
| title_short | JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum |
| title_sort | jwst tst dreams a precise water abundance for hot jupiter wasp 17b from the niriss soss transmission spectrum |
| topic | Exoplanet atmospheres Transmission spectroscopy Hot Jupiters James Webb Space Telescope Exoplanet atmospheric composition Astronomy data analysis |
| url | https://doi.org/10.3847/1538-3881/ad9688 |
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