Oral title: Search for giant planets in the open cluster M67.

Oral abstract: Since 2008 we have carried out a search for massive planets around main-sequence and evolved stars in 
the open cluster M67 using precise radial velocity measurements.
In my talk I will present our stars sample, the science motivations of our research and the different detections in our 
survey. 
Our results show how in contrast with early reports and in agreement with recent findings massive planets around stars 
of open clusters are as frequent as those around field stars. Interesting, we found that the rate of Hot Jupiters (HJs) in the 
cluster (~5.7% for single stars and ~4.5% for the full sample) is substantially higher than in the field.
High metallicity is not a cause for the excess of HJs in M67, nor can the excess be attributed to high stellar masses. 
When combining this rate with the non-zero eccentricity of the orbits, our findings are qualitatively consistent with a HJ 
formation scenario dominated by strong encounters with other stars or binary companions and subsequent planet-planet 
scattering, as predicted by N-body simulations.