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French Team Records 11-Hour Super-Puff Transits, JWST to Probe Atmospheres

6/29/2026

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Summary

Story summary

French researchers at Concordia Station recorded the 11-hour transits of super-puff planets TOI-791b and TOI-791c.
Volunteers in the Planet Hunters TESS citizen-science project first flagged the Jupiter-sized worlds.
Transit-timing variations gave masses that imply densities of 0.038 g/cm³ and 0.047 g/cm³.
Co-authors plan James Webb Space Telescope observations to search for carbon, nitrogen and oxygen species in the planets’ atmospheres.

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Story summary

French researchers at Concordia Station recorded the 11-hour transits of super-puff planets TOI-791b and TOI-791c.
Volunteers in the Planet Hunters TESS citizen-science project first flagged the Jupiter-sized worlds.
Transit-timing variations gave masses that imply densities of 0.038 g/cm³ and 0.047 g/cm³.
Co-authors plan James Webb Space Telescope observations to search for carbon, nitrogen and oxygen species in the planets’ atmospheres.