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Accreting Material from a Hot Jupiter

21 Mar 2015, 22:00 UTC
Accreting Material from a Hot Jupiter
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HD 189733 b is a hot Jupiter circling a K-type star that is somewhat less massive and less luminous than the Sun. Like Jupiter, HD 189733 b is a gas giant planet comprised mostly of hydrogen and helium. However, HD 189733 b orbits very close to its host star, about 30 times closer than Earth is from the Sun. The planet has an orbital period of only 2.22 days. During each orbit, HD 189733 b also transits across the face of its host star. HD 189733 b is slightly more massive and slightly larger in size than Jupiter. Because it is so close to its host star, HD 189733 b is subjected to very intense irradiation, about 275 times more insolation than Earth gets from the Sun. Due to the intense heating, the outer atmosphere of HD 189733 b is known to be evaporating into space.Figure 1: Artist’s impression of HD 189733 b. Credit: NASA’s Goddard Space Flight Center.The host star of HD 189733 b was observed with the Cosmic Origin Spectrograph (COS) on the Hubble Space Telescope (HST). The observations revealed the presence of an active spot on the surface of the star. An indication that HD 189733 b ...

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