A 4MJ planet with a 15.8day orbital period has been detected from very precise radial velocity measurements with the CORALIE echelle spectrograph. A second remote and more massive companion has also been detected. All the planetary companions so far detected in orbit closer than 0.08 AU have a parent star with a statistically higher metal content compared to the metallicity distribution of other stars with planets. Different processes occuring during their formation may provide a possible explanation for this observation.
@article{arxiv.astro-ph/9910223,
title = {A planet orbiting the star Gliese 86},
author = {D. Queloz and M. Mayor and L. Weber and A. Blecha and M. Burnet and B. Confino and D. Naef and F. Pepe and N. Santos and S. Udry},
journal= {arXiv preprint arXiv:astro-ph/9910223},
year = {2007}
}