Cloudy vs. Clear Atmospheres on Exoplanets WASP-67 b and HAT-P-38 b

Cloudy vs. Clear Atmospheres on Exoplanets WASP-67 b and HAT-P-38 b

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Fast Facts
News release ID: STScI-2017-22
Release Date: Jun 5, 2017
Image Use: Copyright
About this image

This diagram compares Hubble Space Telescope observations of two "hot Jupiter"-class planets orbiting very closely to different sunlike stars. Astronomers measured how light from each parent star is filtered through each planet's atmosphere. Hubble near-infrared observations were used to measure the spectral fingerprint caused by the presence of water vapor in the atmosphere. HAT-P-38 b did have a water signature indicated by the absorption-feature peak in the spectrum. This is interpreted as indicating the upper atmosphere is free of clouds or hazes. By contrast, a very similar hot Jupiter, WASP-67 b, has a flat spectrum that lacks any water-absorption feature. This suggests that most of the planet's atmosphere is masked by high-altitude clouds.


Tags
American Astronomical Society Meeting, Annotated, Artwork, Data, Extrasolar Planets, Hubble Telescope

Credits

Artwork: NASA, ESA, and Z. Levy (STScI)
Science: NASA, ESA, and G. Bruno (STScI)