Exoplanet Atmosphere Mapping
TESS maps a hot, mostly cloud-free face on WASP-43b
Visible-light phase curves show excess brightness and an eastward hotspot that point toward deep atmospheric heat.
Briefed September 11, 2026 · Aliens in the Clouds
Developing Preprint · Model-Based Interpretation
Maura Lally and colleagues analyzed five TESS observing sectors for the hot Jupiter WASP-43b and compared its visible-light phase curve with published measurements at longer wavelengths. They measure a secondary-eclipse depth of 130 plus or minus 34 parts per million, brighter than expected from the modeled thermal emission alone. If the extra light is reflection, it still implies a low geometric albedo of roughly 0.05 to 0.10.
The planet's brightest hemisphere is shifted eastward by 44 plus or minus 18 degrees, a larger offset than JWST measured at longer wavelengths. The authors interpret the wavelength-dependent pattern as evidence that the short-wavelength observations reach a hotter, deeper atmospheric layer and that the dayside lacks substantial reflective clouds. This is atmospheric mapping of an extremely hot gas giant, not evidence of habitability or biology.
Why it matters
Combining phase curves across wavelengths turns a point of light into a crude weather map. It also demonstrates why brightness can mix reflected light, atmospheric emission, and depth-dependent circulation.
What the source establishes
Verified new preprint and reported TESS measurements. Atmospheric structure is inferred from phase-curve models; no biosignature or life claim is made.
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