Extra Solar Planets
New Planets Discovered
HD 189733b
Water, water everywhere - on an extrasolar planet
An artist’s impression of a transiting exoplanet, named 'HD 189733b' - Image credit: ESA

11 July 2007

Scientists report the first conclusive discovery of the presence of water vapour in the atmosphere of a planet beyond our Solar System.

The discovery was made in 2005 by analysing the transit of the gas giant HD 189733b across its star in the infrared.

Giovanna Tinetti, ESA fellow at the Institute d’Astrophysique de Paris, and colleagues from around the world, used data from NASA’s Spitzer Space Telescope. Infrared analysis of this gas giant’s transit across its parent star provided the breakthrough.  They targeted planet HD 189733b, 63 light-years away, in the constellation Vulpecula.

Credits: ESA - C.Carreau

Puzzled planet hunters can't find water - Thursday, 22 February 2007

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