Search for giant planets in M67 V: a warm Jupiter orbiting the turn-off star S1429
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Thomas, Luis Saglia, Roberto Pasquini, Luca Brucalassi, Anna Bonifacio, Piercarlo de Medeiros, José Renan Leão, Izan de Castro Martins, Bruno Leonardo Canto Ruh, Henrik Lukas Bedin, Luigi Rolly Libralato, Mattia Biazzo, Katia |
| author_facet | Thomas, Luis Saglia, Roberto Pasquini, Luca Brucalassi, Anna Bonifacio, Piercarlo de Medeiros, José Renan Leão, Izan de Castro Martins, Bruno Leonardo Canto Ruh, Henrik Lukas Bedin, Luigi Rolly Libralato, Mattia Biazzo, Katia |
| contents | 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 $\text{M} \sin i = 1.80 \pm 0.2$ M$_\text{J}$. 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_02911 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Search for giant planets in M67 V: a warm Jupiter orbiting the turn-off star S1429 Thomas, Luis Saglia, Roberto Pasquini, Luca Brucalassi, Anna Bonifacio, Piercarlo de Medeiros, José Renan Leão, Izan de Castro Martins, Bruno Leonardo Canto Ruh, Henrik Lukas Bedin, Luigi Rolly Libralato, Mattia Biazzo, Katia Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics 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 $\text{M} \sin i = 1.80 \pm 0.2$ M$_\text{J}$. 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. |
| title | Search for giant planets in M67 V: a warm Jupiter orbiting the turn-off star S1429 |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2403.02911 |