spitzer_ssc2007-12a July 11th, 2007
Credit: ESA, NASA/ JPL-Caltech/G. Tinett (Instiute d'Astrophysique de Paris, University College London)
This plot of data from NASA's Spitzer Space Telescope tells astronomers that a toasty gas exoplanet, or a planet beyond our solar system, contains water vapor.
Spitzer observed the planet, called HD 189733b, cross in front of its star at three different infrared wavelengths: 3.6 microns, 5.8 microns, and 8 microns (see lime-colored dots). For each wavelength, the planet's atmosphere absorbed different amounts of the starlight that passed through it. The pattern by which this absorption varies with wavelength matches known signatures of water, as shown by the theoretical model in blue.
Provider: Spitzer Space Telescope
Image Source: http://www.spitzer.caltech.edu/images/1811-ssc2007-12a-Exoplanet-Forecast-Hot-and-Wet
Curator: Spitzer Space Telescope, Pasadena, CA, USA
Image Use Policy: Public Domain
Detailed color mapping information coming soon...
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