Gliese581 - a small star 20lightyears from Earth, hosting 5 known planets, is so far the best candidate for a habitable exoplanetary system. But are any of the planets there habitable?

So far we have found 5 exoplanets orbiting Gliese 581 (GL581). They consist of 2 gas-giants, and 3 inner-planets close to the habitable zone around the red dwarf star.

Particulary Gliese581d has been mentioned as the best candidate for a new habitable planet.

Unfortunatly new calculations reveal that GL581d is most likely locked to a permanet day-side and a freezing pwermanent night-side.

The calculations are made based on atmospheric interaction on any planets between 0,117 and 0,175AU from the motherstar GL581.

Their calculations on different mixes of Nitrogen, water and CO2 atmosphere show, that the atmosphere will be completely frozen, unless there is 5% - 95% CO2 in the atmosphere. This is unfortunatly not the case for GL581d.

SEE ARTICLE  on arXiv