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Astrophysics

How Many Transiting Giant Planets Can JWST Search for Moons and Rotational Oblateness?

Le-Chris Wang, Joshua N. Winn

Featured July 26, 2026

Original Paper

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Simply

Scientists predict how many distant giant planets JWST can check for squashed shapes or orbiting moons by carefully watching tiny changes in their starlight.

In depth
The paper forecasts the number of exoplanet systems where the James Webb Space Telescope (JWST) can detect rotational oblateness and moons by analyzing subtle distortions in transit light curves. It leverages detailed JWST noise models, analytic detectability scalings, and giant-planet occurrence rates to identify promising targets, highlighting the critical impact of time-correlated noise on detection yields.

Key Takeaways

  • 1
    JWST can detect rotational oblateness and Ganymede-sized moons in tens to hundreds of systems, depending on the assumed noise model and planetary obliquity distribution.
  • 2
    The detectability relies on analytic scaling relations that link expected signal-to-noise to stellar properties, orbital geometry, and photometric precision, validated through injection-recovery simulations.
  • 3
    Time-correlated noise (red noise) at levels of a few tens of parts per million (ppm) on 1-10 hour timescales can significantly suppress detection yields, emphasizing the need for robust data analysis.

Conceptual Flow

HIGH LEVEL
1
Methodology: Forecasting Detectability

The study used math rules and computer models to guess how many stars JWST could look at to find squashed planets or moons.

Star Catalog
Planet Model
JWST Noise
Calculate Detectability
Favorable Systems Count
2
Results: Predicted Yields

They found that JWST could find squashed planets or moons around many stars, especially if the planets are tilted or the moons are big.

Few Known Systems
Predict Many More
Detections Possible
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