The JWST Transiting Exoplanet Community Early Release Science Program
Published April 30, 2024 | Version v1
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Products and Models for "Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b"

Creators

  • 1. ROR icon Bay Area Environmental Research Institute
  • 2. ROR icon Ames Research Center

Description

Hot Jupiters are among the best-studied exoplanets, but it is still poorly understood how their chemical composition and cloud properties vary with longitude. Theoretical models predict that clouds may condense on the nightside and that molecular abundances can be driven out of equilibrium by zonal winds. Here we report a phase-resolved emission spectrum of the hot Jupiter WASP-43b measured from 5-12 μm with JWST's Mid-Infrared Instrument (MIRI). The spectra reveal a large day-night temperature contrast (with average brightness temperatures of 1524±35 and 863±23 Kelvin, respectively) and evidence for water absorption at all orbital phases. Comparisons with three-dimensional atmospheric models show that both the phase curve shape and emission spectra strongly suggest the presence of nightside clouds which become optically thick to thermal emission at pressures greater than ~100 mbar. The dayside is consistent with a cloudless atmosphere above the mid-infrared photosphere. Contrary to expectations from equilibrium chemistry but consistent with disequilibrium kinetics models, methane is not detected on the nightside (2σ upper limit of 1-6 parts per million, depending on model assumptions).

Files

WASP43b_MIRI_Data.zip

Files (11.5 MB)

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Additional details

Software

Repository URL
https://github.com/kevin218/Eureka
Programming language
Python
Development Status
Active