The Hottest Giant Planet Yet: 7800 degrees F.

[CygnusX-1]

The hottest planet yet is twice Jupiter’s size and hot as a star

by Leah Crane

Link: New Scientist

This planet is 7800 degrees F--versus "only" 860 degrees F for the Sun's hottest planet, Venus.

 

[mfb]

Kepler-70b holds that record, at ~7000 K (12000 F) - hotter than the surface of the Sun.

Edit: Changed thread title, see post 5.

 

[PAllen]

Kepler-70b holds that record, at ~7000 K (12000 F) - hotter than the surface of the Sun.

That link souggest iron as the main constituent. However, that surface temperature is way, way above the point at which iron vaporizes. So does that suggest a relatively short future for this planet.

 

[mfb]

Where is the problem with a gas?
Earth is above the boiling point of nitrogen and it is the main component of the outermost layer.

The density estimates are still discussed, but the planet is certainly very hot.

 

[CygnusX-1]

Apologies. The new planet is the hottest giant planet known; but Kepler 70 b, which is smaller than Earth, is indeed even hotter. So I should have entitled this, "The Hottest Giant Planet Yet: 7800 F."