Variability in the Atmosphere of the Hot Giant Planet HAT-P-7b
New World Weather | astrobites
https://astrobites.org/2016/12/22/new-world-weather/
Climate and weather are hot topics in the news lately, as much on Earth as in astronomy. As we look past our own atmosphere,
we’re beginning to find atmospheres all over the galaxy. A new look at data from NASA’s Kepler mission, reveals the first
detection of a variable atmosphere – indicating weather – on another exoplanet.
The hot Jupiter, known as HAT-P-7 b, was first discovered in 2008 via the transit method, which looks for drops in a star’s
brightness due to the planet passing in front of the star from our line of sight, much like an eclipse. HAT-P-7 b is only
40% larger than Jupiter but much closer to its own star – it completes an orbit in just 2.2 days (in comparison, Mercury has
an 88 day orbit). Like the moon, it is tidally locked, meaning the same side of the planet always faces its host star. At
such a close proximity, this makes the dayside temperatures reach as high as 2860 K.
Using four years of archival Kepler data, the scientists combined data from multiple orbits to look for subtle differences
in brightness. Their results showed definite variations over time, which could not be explained by any changes in
the instruments or in the star. The likely cause? Weather.
---
We Can Now Predict Weather On Alien Worlds
https://www.youtube.com/watch?v=LMp_YYCk2Sc