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Since 2008 we used high-precision radial velocity (RV) measurements obtainedwith different telescopes to detect signatures of massive planets aroundmain-sequence and evolved stars of the open cluster (OC) M67. We aimed toperform a long-term study on giant planet formation in open clusters anddetermine how this formation depends on stellar mass and chemical composition.A new hot Jupiter (HJ) around the main-sequence star YBP401 is reported in thiswork. An update of the RV measurements for the two HJ host-stars YBP1194 andYBP1514 is also discussed. Our sample of 66 main-sequence and turnoff starsincludes 3 HJs, which indicates a high rate of HJs in this cluster (~5.6% forsingle stars and ~4.5% for the full sample ). This rate is much higher thanwhat has been discovered in the field, either with RV surveys or by transits.High metallicity is not a cause for the excess of HJs in M67, nor can theexcess be attributed to high stellar masses. When combining this rate with thenon-zero eccentricity of the orbits, our results are qualitatively consistentwith a HJ formation scenario dominated by strong encounters with other stars orbinary companions and subsequent planet-planet scattering, as predicted byN-body simulations.

Search for giant planets in M67 III: excess of hot Jupiters in dense open clusters