JWST found heavy elements in atmosphere of exoplanet HD 209458 b

5. 10. 2023 (accepted)

JWST found heavy elements in atmosphere of exoplanet HD 209458 b

Star system: HD 209458 | Distance from the Sun: 159 light years

JWST has observed the atmosphere of HD 209458b, a hot Jupiter exoplanet. The observations reveal that the planet has a super-solar metallicity and a very low C/O ratio, suggesting that it has undergone significant contamination by evaporating planetesimals while migrating inward.

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JWST transmission spectroscopy of HD 209458b: a super-solar metallicity, a very low C/O, and no evidence of CH4, HCN, or C2H2 external link

Stars mentioned

HD 209458

G0V, Yellow star

mass: 1.23 M☉

radius: 1 R☉

distance: 159 ly

stars in the system: 1

exoplanets: 1

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