The Hottest Giant Planet Yet: 7800 degrees F.

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Discussion Overview

The discussion revolves around the temperature records of giant exoplanets, specifically focusing on a newly identified planet that reaches 7800 degrees Fahrenheit, and comparisons to Kepler-70b, which is noted to be even hotter. The scope includes theoretical implications of extreme temperatures and the physical characteristics of these planets.

Discussion Character

  • Debate/contested

Main Points Raised

  • Some participants note that the newly identified planet is twice the size of Jupiter and has a temperature of 7800 degrees F, which is significantly higher than that of Venus.
  • Others assert that Kepler-70b holds the record for the hottest planet at approximately 7000 K (12000 F), which is hotter than the Sun's surface.
  • A participant questions the implications of such high temperatures, suggesting that if iron is a main constituent of Kepler-70b, its surface temperature exceeds the vaporization point of iron, potentially indicating a short lifespan for the planet.
  • Another participant points out that Earth exists above the boiling point of nitrogen, which is a major component of its outer layer, raising questions about the nature of gases at extreme temperatures.
  • Clarifications are made regarding the classification of the new planet as the hottest giant planet, while acknowledging that Kepler-70b, which is smaller than Earth, is hotter.

Areas of Agreement / Disagreement

Participants generally agree that Kepler-70b is hotter than the newly identified giant planet, but there is ongoing debate regarding the implications of such high temperatures and the physical characteristics of these planets.

Contextual Notes

There are unresolved questions about the density estimates of these planets and the implications of their extreme temperatures on their physical states and longevity.

CygnusX-1
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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.
 
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Kepler-70b holds that record, at ~7000 K (12000 F) - hotter than the surface of the Sun.

Edit: Changed thread title, see post 5.
 
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mfb said:
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.
 
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.
 
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."
 

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