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More Images: NASA's Chandra: Planets Can Be Anti-Aging Formula for Stars
1
Illustration of Hot Jupiters
(Credit: NASA/CXC/M.Weiss)
Click for large jpg Illustration
Jpeg, Tif
An artist’s illustration shows a gas giant planet (lower right) closely orbiting its host star (left), with another star in the distance (upper right). The two stars are themselves in orbit with each other.

2
X-ray Images of Hot Jupiters
(Credit: NASA/CXC/Potsdam Univ./N. Ilic et al.)
Click for large jpg X-ray
HD189733 & WASP-77
(Labeled)
Jpeg, Tif
Click for large jpg X-ray
HD189733 & WASP-77
(Unlabeled)
Jpeg, Tif
Click for large jpg X-ray
HD46375 & HD109749
(Labeled)
Jpeg, Tif
Click for large jpg X-ray
HD46375 & HD109749
(Unlabeled)
Jpeg, Tif
Chandra data for two of the systems where one star is orbited by a hot Jupiter (HD189733 and WASP-77) and two with neither star orbited by a hot Jupiter (HD46375 and HD109749). In the latter two systems one of the stars hosts a planet that is more distant or has a lower mass than a hot Jupiter. The stars with hot Jupiters are clearly brighter than their companion stars, including a non-detection for the companion in WASP-77. The stars without hot Jupiters have comparable brightness to their companions. This dependence of a star's X-ray brightness on the type of planet it hosts shows that hot Jupiters make their host stars act younger than they really are.


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