Planets Make it Harder to Figure out a Star's age - by ScottyJ_PhD
Now it seems that exoplanets might throw another wrench in the works.
“It’s almost like using twins in a study where one twin lives in a completely different neighborhood that affects their health. By comparing one star with a nearby planet to its twin without one, we can study the differences in behavior of the same-aged stars,” says Katja Poppenhäger, head of the Stellar Physics and Exoplanets section at AIP.
Chandra data for two systems where one star is orbited by 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. Image Credit: NASA/CXC/Potsdam Univ./N. Ilic et al. The authors also considered whether the increase in X-ray emissions was caused by magnetic fields rather than tidal forces – after all, planets like Jupiter tend to have powerful magnetic fields. But the fact that the stars also rotated more quickly in addition to the increased X-ray activity indicates a gravitational, that is, tidal, source for the de-aging process, not a magnetic one.
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