Three planetary companions around M67 stars

Abstract

For the past six years we have carried out a search for massive planets around main sequence and evolved stars in the open cluster (OC) M67, using radial velocity (RV) measurements obtained with HARPS at ESO (La Silla), SOPHIE at OHP and HRS at HET. Additional RV data come from CORALIE at the Euler Swiss Telescope. We aim to perform a long-term study on giant planet formation in open clusters and determine how it depends on stellar mass and chemical composition. We report the detection of three new extrasolar planets: two in orbit around the two G dwarfs YBP1194 and YBP1514, and one around the evolved star S364. The orbital solution for YBP1194 yields a period of 6.9 days, an eccentricity of 0.24, and a minimum mass of 0.34 Mj. YBP1514 shows periodic RV variations of 5.1 days, a minimum mass of 0.40 Mj, and an eccentricity of 0.39. The best Keplerian solution for S364 yields a period of 121.7 days, an eccentricity of 0.35 and a minimum mass of 1.54 Mj. An analysis of H_alpha core flux measurements as well as of the line bisectors spans revealed no correlation with the RV periods, indicating that the RV variations are best explained by the presence of a planetary companion. Remarkably, YBP1194 is one of the best solar twins identified so far, and YBP1194b is the first planet found around a solar twin that belongs to a stellar cluster. In contrast with early reports and in agreement with recent findings, our results show that massive planets around stars of open clusters are as frequent as those around field stars.

7 pages (3 of supplementary online material), 4 figures, 5 tables. Published in: Astronomy & Astrophysics Letter, Volume 561, page L9, 2014. http://www.aanda.org/articles/aa/abs/2014/01/aa22584-13/aa22584-13.html

References in corpus (11)

• The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters
• Planets around evolved intermediate-mass stars. I. Two substellar companions in the open clusters NGC 2423 and NGC 4349
• Efficient fitting of multiplanet Keplerian models to radial velocity and astrometry data
• SOPHIE velocimetry of Kepler transit candidates VII. A false-positive rate of 35% for Kepler close-in giant exoplanet candidates
• Dynamics of Planetary Systems in Star Clusters
• The SEGUE Stellar Parameter Pipeline. IV. Validation with an Extended Sample of Galactic Globular and Open Clusters
• Ground-based CCD astrometry with wide field imagers. II. A star catalogue for M67: [email protected] MPG/ESO astrometry, FLAMES@VLT radial velocities
• Solar twins in M67
• Proplyds and Massive Disks in the Orion Nebula Cluster Imaged with CARMA and SMA
• Deep MMT Transit Survey of the Open Cluster M37 IV: Limit on the Fraction of Stars With Planets as Small as 0.3 R_J
• A Photometric Survey for Variables and Transits in the Field of Praesepe with KELT

Cited by in corpus (56)

• The K2 Mission: Characterization and Early results
• The GAPS programme with HARPS-N at TNG XI. Pr~0211 in M~44: the first multi-planet system in an open cluster
• Rotation periods for cool stars in the 4 Gyr-old open cluster M67, the solar-stellar connection, and the applicability of gyrochronology to at least solar age
• Stellar Radial Velocities in the Old Open Cluster M67 (NGC 2682) I. Memberships, Binaries, and Kinematics
• The Hyades open cluster is chemically inhomogeneous
• Stability of Multiplanetary Systems in Star Clusters
• The chemical compositions of solar twins in the open cluster M67
• K2 Discovers a Busy Bee: An Unusual Transiting Neptune Found in the Beehive Cluster
• Dynamical Interactions Make Hot Jupiters in Open Star Clusters
• Chemical Abundances of Main-Sequence, Turn-off, Subgiant and red giant Stars from APOGEE spectra I: Signatures of Diffusion in the Open Cluster M67
• A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- I. Search for exoplanets and variable stars in the field of 47 Tuc
• Planets In Young Massive Clusters: On the survivability of planets in young massive clusters and its implication of planet orbital architectures in globular clusters
• Search for giant planets in M67 III: excess of hot Jupiters in dense open clusters
• Companions to APOGEE Stars I: A Milky Way-Spanning Catalog of Stellar and Substellar Companion Candidates and their Diverse Hosts
• A PSF-based approach to Kepler/K2 data. I. Variability within the K2 Campaign 0 star clusters M 35 and NGC 2158
• A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- II. Search for exoplanets in open clusters of the southern ecliptic hemisphere and their frequency
• The Gaia-ESO Survey: Evidence of atomic diffusion in M67?
• Variable stars in one open cluster within the Kepler/K2-Campaign-5 field: M 67 (NGC 2682)
• Parent Stars of Extrasolar Planets - XIV. Strong Evidence of Li Abundance Deficit
• A Low-Mass Exoplanet Candidate Detected By $K2$ Transiting the Praesepe M Dwarf JS 183
• Search for giant planets in M67 IV: survey results
• Three Small Planets Transiting a Hyades Star
• Survival Rates of Planets in Open Clusters: the Pleiades, Hyades, and Praesepe clusters
• SWEET-Cat update and FASMA. A new minimization procedure for stellar parameters using high-quality spectra
• A new solar fluorine abundance and a fluorine determination in the two open clusters M 67 and NGC 6404
• How do disks and planetary systems in high-mass open clusters differ from those around field stars?
• Stellar rotational periods in the planet hosting open cluster Praesepe
• Discovery of a Transiting Adolescent Sub-Neptune Exoplanet with K2
• A PSF-based approach to Kepler/K2 data - III. Search for exoplanets and variable stars within the open cluster M 67 (NGC 2682)
• On the survival of resonant and non-resonant planetary systems in star clusters
• Planets Across Space and Time (PAST). V. The evolution of hot Jupiters revealed by the age distribution of their host stars
• K2-231 b: A sub-Neptune exoplanet transiting a solar twin in Ruprecht 147
• Globular Clusters as Cradles of Life and Advanced Civilizations
• Ultraviolet stellar population of the old open cluster M67 (NGC 2682)
• NIRPS joining HARPS at ESO 3.6 m. On-sky performance and science objectives
• Hot Jupiter and ultra-cold Saturn formation in dense star clusters
• Keplerian periodogram for Doppler exoplanets detection: optimized computation and analytic significance thresholds
• The detailed chemical composition of the terrestrial planet host Kepler-10
• Hot Jupiter formation in dense clusters: secular chaos in multi-planetary systems
• Lithium in Open Cluster Red Giants Hosting Substellar Companions
• Variability Among Stars in the M 67 Field from Kepler/K2-Campaign-5 Light Curves
• Did a stellar fly-by shape the planetary system around Pr 0211 in the cluster M 44?
• Planets around evolved intermediate-mass stars in open clusters II. Are there really planets around IC4651No9122, NGC2423No3 and NGC4349No127?
• Radial-velocity search and statistical studies for short-period planets in the Pleiades open cluster
• Multiplexing Precision RVs: Searching for Close in Gas Giants in Open Clusters
• Making hot Jupiters in stellar clusters: the importance of binary exchange
• Science Case and Requirements for the MOSAIC Concept for a Multi-Object Spectrograph for the European Extremely Large Telescope
• Constraining Planetary Migration and Tidal Dissipation with Coeval Hot Jupiters
• Change in the Orbital Period of a Binary System Due to Dynamical Tides for Main-Sequence Stars
• Dynamics of passing-stars-perturbed binary star systems
• Non-radial oscillations mimicking a brown dwarf orbiting the cluster giant NGC 4349 No. 127
• On the incidence of planet candidates in open clusters and a planet confirmation
• iota Horologii is unlikely to be an evaporated Hyades star
• TYCHO -- Realistically Simulating Exoplanets within Stellar Clusters I: Improving the Monte Carlo Approach
• Search for giant planets in M67 V: a warm Jupiter orbiting the turn-off star S1429
• 3D models of the circumstellar environments of evolved stars: Formation of multiple spiral structures