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Home NEWS Science News

Winds of rubies and sapphires strike the sky of giant planet

Bioengineer by Bioengineer
December 12, 2016
in Science News
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Credit: University of Warwick/Mark Garlick

  • Weather detected on HAT-P-7b – a planet 16x larger than Earth, over 1000 light years away
  • First ever gas giant outside our solar system to reveal weather patterns
  • Clouds on planet could be made of corundum, the mineral which forms rubies and sapphires
  • Kepler satellite measured changes in the light reflected from planet

Signs of powerful changing winds have been detected on a planet 16 times larger than Earth, over 1000 light years away – the first time ever that weather systems have been found on a gas giant outside our solar system – according to new research by the University of Warwick.

Dr David Armstrong in Warwick's Astrophysics Group has discovered that the gas giant HAT-P-7b is affected by large scale changes in the strong winds moving across the planet, likely leading to catastrophic storms.

This discovery was made by monitoring the light being reflected from the atmosphere of HAT-P-7b, and identifying changes in this light, showing that the brightest point of the planet shifts its position.

This shift is caused by an equatorial jet with dramatically variable wind-speeds – at their fastest, pushing vast amounts of cloud across the planet.

The clouds themselves would be visually stunning – likely made of up corundum, the mineral which forms rubies and sapphires.

The planet could never be inhabitable, due to its likely violent weather systems, and unaccommodating temperatures. One side of the planet always faces the star, because it is tidally locked, and that side remains much hotter than the other – the day side average temperature on HAT-P-7 being 2860K.

Thanks to this pioneering research, astrophysicists can now begin to explore how weather systems on other planets outside our solar system change over time.

Dr Armstrong comments on the discovery:

"Using the NASA Kepler satellite we were able to study light reflected from HAT-P-7b's atmosphere, finding that the atmosphere was changing over time. HAT-P-7b is a tidally locked planet, with the same side always facing its star. We expect clouds to form on the cold night side of the planet, but they would evaporate quickly on the hot dayside.

"These results show that strong winds circle the planet, transporting clouds from the night side to the dayside. The winds change speed dramatically, leading to huge cloud formations building up then dying away. This is the first detection of weather on a gas giant planet outside the solar system."

First discovered in 2008, HAT-P-7b is 320 parsecs (over 1040 light years) away from us. It is an exoplanet 40% larger than Jupiter and 500 times more massive than the Earth – and orbits a star 50% more massive, and twice as large, as the Sun.

###

The work was led by the University of Warwick, and performed by a team of scientists from Warwick, Queens University Belfast, Dublin City University and University College London.

The paper, 'Variability in the Atmosphere of the Hot Jupiter HAT-P-7', is published in the first issue of Nature Astronomy.

Media Contact

Luke Walton
[email protected]
44-782-454-0863
@warwicknewsroom

http://www.warwick.ac.uk

############

Story Source: Materials provided by Scienmag

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