It is worth noting that while the radiation from Alpha Centauri B makes its neighborhood slightly worse than that of Alpha Centauri A, the third star in the system, where we have found an exoplanet, is the most hostile among the three.
Polyphemis: An enormous planet, a gas giant almost twice the size of Jupiter, which in turn orbits the yellow sun of Alpha Centauri B. Its appearance is comparable to the eye of an angry deity leering down on Pandora.
"Our observations extended over more than four years using the HARPS instrument and have revealed a tiny, but real, signal from a planet orbiting Alpha Centauri B every 3.2 days," said Xavier Dumusque (Geneva Observatory, Switzerland, and Centro de Astrofisica da Universidade do Porto, Portugal), lead author of the paper.
European astronomers claim in the October 18th Nature that they have discovered an Earth-mass planet tightly orbiting Alpha Centauri B, a yellow-orange K1 star about 85% as luminous as the Sun in the closest stellar system to ours.
Brian Wood and Jeffrey Linsky (University of Colorado) and Gary Zank and Hans Mueller (Bartol Research Institute) used the Hubble Space Telescope to analyze an ultraviolet spectral line of Alpha Centauri B, the dimmer member of the famous binary star just 4.4 light-years away.