Astronomy and Astrophysics, volume 592, L1-1 (2016/8-1)
Search for giant planets in M67. III. Excess of hot Jupiters in dense open clusters.
BRUCALASSI A., PASQUINI L., SAGLIA R., RUIZ M.T., BONIFACIO P., LEAO I., CANTO MARTINS B.L., DE MEDEIROS J.R., BEDIN L.R., BIAZZO K., MELO C., LOVIS C. and RANDICH S.
Abstract (from CDS):
Since 2008 we used high-precision radial velocity (RV) measurements obtained with different telescopes to detect signatures of massive planets around main-sequence and evolved stars of the open cluster (OC) M67. We aimed to perform a long-term study on giant planet formation in open clusters and determine how this formation depends on stellar mass and chemical composition. A new hot Jupiter (HJ) around the main-sequence star YBP401 is reported in this work. An update of the RV measurements for the two HJ host-stars YBP1194 and YBP1514 is also discussed. Our sample of 66 main-sequence and turnoff stars includes 3 HJs, which indicates a high rate of HJs in this cluster (5.6+5.4–2.6% for single stars and 4.5%+4.5–2.5% for the full sample). This rate is much higher than what 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 the excess be attributed to high stellar masses. When combining this rate with the non-zero eccentricity of the orbits, our results 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.
© ESO, 2016
planets and satellites: gaseous planets - techniques: radial velocities
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