Gliese 581 E Is The Lightest Exoplanet Discovered So Far

[Radojica]

This is a bit old news, but it is worth a reading.

Exoplanet researcher Michel Mayor today announced the discovery of the lightest exoplanet found so far. The planet, Gliese 581 e, in the famous system Gliese 581, is only about twice the mass of our Earth. The team also refined the orbit of the planet Gliese 581 d, first discovered in 2007, placing it well within the habitable zone, where liquid water oceans could exist.

These amazing discoveries are the outcome of more than four years of observations using the most successful low-mass-exoplanet hunter in the world, the HARPS spectrograph attached to the 3.6-meter ESO telescope at La Silla, Chile.

The discovery of Gliese 581 e was announced today at the JENAM conference during the European Week of Astronomy&Space Science, which is taking place at the University of Hertfordshire, UK.

By refining the orbit of the planet Gliese 581 d, first discovered in 2007, a team of astronomers has shown that it lies well within the habitable zone, where liquid water oceans could exist. This diagram shows the distances of the planets in the Solar System (upper row) and in the Gliese 581 system (lower row), from their respective stars (left). The habitable zone is indicated as the blue area, showing that Gliese 581 d is located inside the habitable zone around its low-mass red star. Based on a diagram by Franck Selsis, Univ. of Bordeaux. Credit: ESO

http://www.scientificblogging.com/ne...covered_so_far

[Radojica]

http://www.megavideo.com/?v=HE77298F

great doc about exoplanets.

Alien Earths: Join leading astronomers on a visual journey beyond our solar system in search of planets like Earth. Using CGI animation, we'll explore bizarre worlds that stretch our imagination: planets with iron rain and hot ice, with diamonds everywhere, and endless oceans of gas. Planets with abnormal orbital patterns and planets with no pattern at all that drift alone in the Milky Way. Planets so strange we never could have predicted them before. Could life exist there?