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Exoplanetary Scratchpad

[SysBP Img]

F8 star also known as GSC 03547-01402 containing a transiting Hot Jupiter and an outer Jovian and a further out stellar companion. Transiting planet was used as a test for the Kepler mission (dubbed Kepler 2), which was able to detect the planet's occulation, as well as evidence of phases. Very little of its heat is transported to its night side, with its hottest spot being 1,300 F hotter than its coldest spot. Extremely strong easterly winds are produced as a result, but the planet's magnetic field has been shown to disrupt the direction of these winds at some times. This is because the high temperatures strip electrons from the atmospheric atoms of lithium, sodium, and potassium, making them positively charged, which follow the magnetic field lines. The stronger field lines may completely reverse the direction of the winds. Variation in brightness has been thought to be due to clouds of corundum (which emeralds and sapphires are made of) being blown into the dayside by the winds and then dissipating in the intense heat. Its atmosphere could be made up of exotic gases like Titanium Oxide. The Hubble Space Telescope made its 1,000,000th science observation on this planet in the attempt to detect water in its atmosphere. The planet may "lift" its stars surface up gravitationally, reducing its temperature a fraction of a degree in a darkened spot that lags a few hours behind the planet. It was found by a Japanese team to be orbiting backwards only a day after the first retrograde exoplanet WASP-17b was announced. The Japanese team inspected two stars nearby, measured their proper motions, and found that one of them was a member of the system. They also confirmed an outer radial velocity detected Jovian between the planet c and companion star B. Star B is suspected of tilting planet c's orbit, which in turn affected planet b's orbit and caused it to orbit backwards.

HAT-P-7 System Web Pages[]

HAT-P-7 System In the News[]

Kepler Detects Occulation, Proves its Abilities (2009)[]

Found to be Orbiting Backwards (Aug 2009)[]

See also WASP-17 System

Subject of 1 Millionth Science Observation by Hubble (2011)[]

Outer planet and star May Cause Retrograde Motion (Jan 2013)[]

Gravity May Darken Spot on Star (Feb 2013)[]

Clouds of Rubies and Sapphires (Dec 2016)[]

Magnetism Disrupts Winds (May 2017)[]

See Also[]