Search for giant planets in M67 IV: survey results
A. Brucalassi, J. Koppenhoefer, R. Saglia, L. Pasquini, M.T. Ruiz, P., Bonifacio, L. R. Bedin, M. Libralato, K. Biazzo, C. Melo, C. Lovis, S., Randich

TL;DR
This seven-year radial velocity survey of 88 stars in M67 identified several giant planets and candidates, revealing a hot Jupiter rate higher than in the field, and providing insights into planet occurrence in open clusters.
Contribution
First detailed long-term RV survey of M67, providing new data on giant planet frequency and binary candidates in an open cluster environment.
Findings
Giant planet occurrence rate in M67 is ~18%.
Hot Jupiter rate in M67 is ~5.7%, higher than in the field.
Detected multiple binary candidates and planetary systems.
Abstract
We present the results of a seven-year-long radial velocity survey of a sample of 88 main-sequence and evolved stars to reveal signatures of Jupiter-mass planets in the solar-age and solar-metallicity open cluster M67. We aim at studying the frequency of giant planets in this cluster with respect to the field stars. In addition, our sample is also ideal to perform a long-term study to compare the chemical composition of stars with and without giant planets in detail. We analyzed precise radial velocity (RV) measurements obtained with five different instruments. We conducted Monte Carlo simulations to estimate the occurrence rate of giant planets in our radial velocity survey. All the planets previously announced in this RV campaign with their properties are summarized here: 3 hot Jupiters around the main-sequence stars YBP1194, YBP1514, and YBP401, and 1 giant planet around the evolved…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astro and Planetary Science · Astrophysics and Star Formation Studies
