Search for giant planets in M67 V: a warm Jupiter orbiting the turn-off star S1429
Astronomy & Astrophysics(2024)
摘要
Planets orbiting members of open or globular clusters offer a great
opportunity to study exoplanet populations systematically as stars within
clusters provide a mostly homogeneous sample at least in chemical composition
and stellar age. However, even though there have been coordinated efforts to
search for exoplanets in stellar clusters, only a small number of planets has
been detected. One successful example is the seven-year radial velocity (RV)
survey "Search for giant planets in M67" of 88 stars in the open cluster M67
which led to the discovery of five giant planets, including three close-in (P
< 10 days) hot-Jupiters. In this work, we continue and extend the observation
of stars in M67 with the aim to search for additional planets. We conducted
spectroscopic observations with the HPF, HARPS, HARPS-North, and SOPHIE
spectrographs of 11 stars in M67. Six of our targets showed a variation or
long-term trends in their RV during the original survey, while the other five
were not observed in the original sample bringing the total number of stars to
93. An analysis of the radial velocities revealed one additional planet around
the turn-off point star S1429 and gave solutions for the orbits of stellar
companions around S2207 and YBP2018. S1429 b is a warm Jupiter on a likely
circular orbit with a period of 77.48_-0.19^+0.18 days and a minimum mass
Msin i = 1.80 ± 0.2 M_J. We update the hot-Jupiter
occurrence rate in M67 to include the five new stars, deriving
4.2_-2.3^+4.1% when considering all stars, and 5.4_-3.0^+5.1%
if binary star systems are removed.
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