JWST-TST DREAMS: Nonuniform Dayside Emission for WASP-17b from MIRI/LRS

Daniel Valentine; Hannah R. Wakeford; Ryan C. Challener; Natasha E. Batalha; Nikole K. Lewis; David Grant; Elijah Mullens; Lili Alderson; Jayesh Goyal; Ryan J. MacDonald; Erin M. May; Sara Seager; Kevin B. Stevenson; Jeff A. Valenti; Natalie H. Allen; Néstor Espinoza; Ana Glidden; Amélie Gressier; Jingcheng Huang; Zifan Lin; Douglas Long; Dana R. Louie; Mark Clampin; Marshall Perrin; Roeland P. van der Marel; C. Matt Mountain

doi:10.3847/1538-3881/ad5c61

The Astronomical Journal (Jan 2024)

JWST-TST DREAMS: Nonuniform Dayside Emission for WASP-17b from MIRI/LRS

Daniel Valentine,
Hannah R. Wakeford,
Ryan C. Challener,
Natasha E. Batalha,
Nikole K. Lewis,
David Grant,
Elijah Mullens,
Lili Alderson,
Jayesh Goyal,
Ryan J. MacDonald,
Erin M. May,
Sara Seager,
Kevin B. Stevenson,
Jeff A. Valenti,
Natalie H. Allen,
Néstor Espinoza,
Ana Glidden,
Amélie Gressier,
Jingcheng Huang,
Zifan Lin,
Douglas Long,
Dana R. Louie,
Mark Clampin,
Marshall Perrin,
Roeland P. van der Marel,
C. Matt Mountain

Affiliations

Daniel Valentine: ORCiD; University of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UK ; [email protected]
Hannah R. Wakeford: ORCiD; University of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UK ; [email protected]
Ryan C. Challener: ORCiD; Department of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USA
Natasha E. Batalha: ORCiD; NASA Ames Research Center , MS 245-3, Moffett Field, CA 94035, USA
Nikole K. Lewis: ORCiD; Department of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USA
David Grant: ORCiD; University of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UK ; [email protected]
Elijah Mullens: ORCiD; Department of Astronomy and Carl Sagan Institute, Cornell University , 122 Sciences Drive, Ithaca, NY 14853, USA
Lili Alderson: ORCiD; University of Bristol , HH Wills Physics Laboratory, Tyndall Avenue, Bristol, UK ; [email protected]
Jayesh Goyal: ORCiD; School of Earth and Planetary Sciences (SEPS), National Institute of Science Education and Research (NISER) , HBNI, Odisha, India
Ryan J. MacDonald: ORCiD; Department of Astronomy, University of Michigan , 1085 S. University Avenue, Ann Arbor, MI 48109, USA
Erin M. May: ORCiD; Johns Hopkins University Applied Physics Laboratory , 11100 Johns Hopkins Road, Laurel, MD 20723, USA
Sara Seager: ORCiD; Department 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, USA
Kevin B. Stevenson: ORCiD; Johns Hopkins University Applied Physics Laboratory , 11100 Johns Hopkins Road, Laurel, MD 20723, USA
Jeff A. Valenti: ORCiD; Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
Natalie H. Allen: ORCiD; William H. Miller III Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USA
Néstor Espinoza: ORCiD; Space 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, USA
Ana Glidden: ORCiD; Department 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
Amélie Gressier: ORCiD; Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
Jingcheng Huang: ORCiD; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
Zifan Lin: ORCiD; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
Douglas Long: ORCiD; Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
Dana R. Louie: ORCiD; Catholic 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, USA
Mark Clampin: NASA Headquarters , 300 E Street SW, Washington, DC 20546, USA
Marshall Perrin: ORCiD; Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
Roeland P. van der Marel: ORCiD; Space 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, USA
C. Matt Mountain: Association of Universities for Research in Astronomy , 1331 Pennsylvania Avenue NW Suite 1475, Washington, DC 20004, USA

DOI: https://doi.org/10.3847/1538-3881/ad5c61
Journal volume & issue: Vol. 168, no. 3
p. 123

Abstract

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We present the first spectroscopic characterization of the dayside atmosphere of WASP-17b in the mid-infrared using a single JWST MIRI/LRS eclipse observation. From forward-model fits to the 5–12 μ m emission spectrum, we tightly constrain the heat redistribution factor of WASP-17b to be 0.92 ± 0.02 at the pressures probed by this data, indicative of inefficient global heat redistribution. We also marginally detect a supersolar abundance of water, consistent with previous findings for WASP-17b, but note our weak constraints on this parameter. These results reflect the thermodynamically rich but chemically poor information content of MIRI/LRS emission data for high-temperature hot Jupiters. Using the eclipse mapping method, which utilizes the signals that the spatial emission profile of an exoplanet imprints on the eclipse light curve during ingress/egress due to its partial occultation by the host star, we also construct the first eclipse map of WASP-17b, allowing us to diagnose its multidimensional atmospheric dynamics for the first time. We find a day–night temperature contrast of order 1000 K at the pressures probed by this data, consistent with our derived heat redistribution factor, along with an eastward longitudinal hotspot offset of ${18.7}_{-3.8}^{+11.1\circ }$ , indicative of the presence of an equatorial jet induced by day–night thermal forcing being the dominant redistributor of heat from the substellar point. These dynamics are consistent with general circulation model predictions for WASP-17b. This work is part of a series of studies by the JWST Telescope Scientist Team, in which we use Guaranteed Time Observations to perform Deep Reconnaissance of Exoplanet Atmospheres through Multi-instrument Spectroscopy.

Published in The Astronomical Journal

ISSN: 0004-6256 (Print); 1538-3881 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Astronomy
Website: https://iopscience.iop.org/journal/1538-3881

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