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September 30, 2025Open Access

Precise Constraints on the Energy Budget of WASP-121 b from its JWST NIRISS/SOSS Phase Curve

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Authors

JSJared SplinterLCLouis-Philippe CoulombeRFRobert C. Frazier

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Overview

Observational analysis reveals energy budget constraints in WASP-121 b's atmosphere, indicating inefficient heat redistribution.

Key Points

  • The phase-dependent effective temperatures indicate a stark temperature contrast between day and night.
  • The Bond albedo calculated for WASP-121 b is notably higher than previous measurements, suggesting unique atmospheric characteristics.
  • The NIRISS/SOSS phase curve captured a significant portion of the planet's bolometric flux, enhancing previous measurements.
  • Unexpectedly low wind speeds suggest that heat redistribution on WASP-121 b is less efficient than anticipated.

Cite This Study

Splinter et al. (2025) studied this question.

synapsesocial.com/papers/68dc12d38a7d58c25ebb0ff2https://doi.org/10.48550/arxiv.2509.09760
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