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- W1972890490 abstract "'Hot Jupiters', extrasolar giant planets orbiting close to their parent stars, have transformed our view about what planets are and how they form. One in particular, HD 209458b, was found to have a huge escaping atmosphere that forms a comet-like tail. New Hubble Space Telescope observations of HD 209458b reveal a hot dense layer in its atmosphere where the temperature rises and atmospheric gas accelerates to escape the planet. This detection provides a new way to study the complex escape process of extrasolar planetary atmospheres. The atmospheres of extrasolar giant planets orbiting close to their parent stars are heated by the immense stellar irradiation. For the planet HD 209458b, this causes a sizable expansion of the atmosphere, and escape of neutral hydrogen gas. This paper reports the detection of absorption by hot hydrogen in the atmosphere of HD 209458b, probing a layer where the escaping gas forms in HD 209458b's upper atmosphere. About ten per cent of the known extrasolar planets are gas giants that orbit very close to their parent stars. The atmospheres of these ‘hot Jupiters’ are heated by the immense stellar irradiation1,2,3,4,5. In the case of the planet HD 209458b, this energy deposition results in a hydrodynamic state in the upper atmosphere, allowing for sizeable expansion and escape of neutral hydrogen gas2,3,4,5,6. HD 209458b was the first extrasolar planet discovered that transits in front of its parent star7. The size of the planet can be measured using the total optical obscuration of the stellar disk during an observed transit, and the structure and composition of the planetary atmosphere can be studied using additional planetary absorption signatures in the stellar spectrum. Here we report the detection of absorption by hot hydrogen in the atmosphere of HD 209458b. Previously, the lower atmosphere and the full extended upper atmosphere of HD 209458b have been observed2,6,8, whereas here we probe a layer where the escaping gas forms in the upper atmosphere of HD 209458b." @default.
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- W1972890490 date "2007-02-01" @default.
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- W1972890490 title "The signature of hot hydrogen in the atmosphere of the extrasolar planet HD 209458b" @default.
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- W1972890490 doi "https://doi.org/10.1038/nature05525" @default.
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