Search for giant planets in M67 I. Overview
L. Pasquini, A. Brucalassi, M. T. Ruiz, P. Bonifacio, C. Lovis, R., Saglia, C. Melo, K. Biazzo, S. Randich, L. R. Bedin

TL;DR
This study uses precise radial velocity measurements of stars in M67 to identify potential exoplanets and binary systems, providing insights into planet formation in open clusters of solar metallicity.
Contribution
First comprehensive radial velocity survey of M67 stars, identifying candidates for hosting substellar companions and analyzing cluster characteristics.
Findings
11 binary candidates identified
11 stars show RV variability suggestive of substellar companions
Confirmed that RV measurements are consistent across stellar types
Abstract
Precise stellar radial velocities are used to search for massive (Jupiter masses or higher) exoplanets around the stars of the open cluster M67. We aim to obtain a census of massive exoplanets in a cluster of solar metallicity and age in order to study the dependence of planet formation on stellar mass and to compare in detail the chemical composition of stars with and without planets. This first work presents the sample and the observations, discusses the cluster characteristics and the radial velocity (RV) distribution of the stars, and individuates the most likely planetary host candidates. We observed a total of 88 main-sequence stars, subgiants, and giants all highly probable members of M67, using four telescopes and instrument combinations. We investigate whether exoplanets are present by obtaining radial velocities with precisions as good as 10 m/s. To date, we have performed 680…
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