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« The Golden Dragons | Main | systemic planet finding »
Category: astro
Posted on: April 25, 2007 2:51 PM, by Steinn Sigurðsson
earlier this year I was a co-author on a paper which, among other things, attempted to "predict" which of the currently known planetary systems we might expect to find future planets in the habitable zones - specifically terrestrial or "super Earth" planets.
Gliese 581 was on our list (p. 33)
I like it.
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Comments
IF the gravity if 5x that of Earth, does that increase the temperature at the surface?
Posted by: elgar | April 25, 2007 8:06 PM
The gravity does not scale just with mass but also with the inverse square of the radius.
We don't know what the planet is made of, but for plausible compositions you infer a surface gravity of maybe 50-70% higher than the Earth.
All things being equal that'd give you a deeper, higher atmospheric pressure at the surface, which could give you a higher effective surface temperature. Kinda depends on a lot of things.
Posted by: Steinn Sigurdsson | April 25, 2007 9:24 PM
Thanks! I was telling people I'd weigh 750 pounds on that planet, but I could probably stagger along at 300. Briefly.
Posted by: elgar | April 26, 2007 11:30 PM