A search for planets in the metal-enriched binary HD 219542

Abstract

The components of the wide binary HD 219542 were recently found to differ in metallicity by about 0.1 dex (Gratton et al. A&A 377, 123). In this paper, we present the results of 2 years of high precision radial velocity monitoring of these stars performed at the Telecopio Nazionale Galileo (TNG) using the high resolution spectrograph SARG. No indication for radial velocity variations above the measurement errors (5 m/s) was found for the metal richer component A. This allows us to place upper mass-limits for planets around this star. HD 219542B instead shows a low amplitude variation with a 112 day period at a confidence level of about 96-97%. This might suggest the presence of a Saturn-mass planet, although it is still possible that these variations are due to moderate activity of the star. Tests based on variations of bisectors, stellar magnitude and line equivalent widths were inconclusive so far.

15 pages, 16 figures, A&A, in press

References in corpus (25)

• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• Long-Term Stability of Planets in Binary Systems
• No planet for HD 166435
• The Discovery of a Planetary Companion to 16 Cygni B
• The metal-rich nature of stars with planets
• The Lick Planet Search: Detectability and Mass Thresholds
• Parent Stars of Extrasolar Planets VI: Abundance Analyses of 20 New Systems
• The Mass of the Convective Zone in FGK Main Sequence Stars and the Effect of Accreted Planetary Material on Apparent Metallicity Determinations
• On the Mass-Period Correlation of the Extrasolar Planets
• HD 80606 b, a planet on an extremely elongated orbit
• A Planet at 5 AU Around 55 Cancri
• The Abundance Distribution in the Extrasolar-Planet Host Star HD19994
• Sub-Saturn Planet Candidates to HD 16141 and HD 46375
• The High Eccentricity of the Planet Around 16 Cyg B
• A Critical Examination of Li Pollution and Giant Planet Consumption by a Host Star
• A Differential Spectroscopic Analysis of 16 Cygni A and B
• A Search for ${}^6$Li in Stars with Planets
• Searching for Planets in the Hyades II: Some Implications of Stellar Magnetic Activity
• The Host Stars of Extrasolar Planets Have Normal Lithium Abundances
• The planet search program at the ESO Coude Echelle spectrometer. III. The complete Long Camera survey results
• Stellar Pollution in the Solar Neighborhood
• Further evidence for the planet around 51 Pegasi
• On the Double Planet System Around HD 83443
• A Planet Candidate in the Stellar Triple System HD178911
• Galactic orbits of stars with planets

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• Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation
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• Statistical properties of exoplanets III. Planet properties and stellar multiplicity
• Abundance differences between components of wide binaries
• Four new wide binaries among exoplanet host stars
• A possibly inflated planet around the bright, young star DS Tuc A
• A giant planet in the triple system HD132563
• Line bisectors and radial velocity jitter from SARG spectra
• Spectroscopic abundance analysis of dwarfs in young open cluster IC 4665
• No Planet Around HD 219542 B
• Asteroseismology of Procyon A with SARG at TNG
• Accretion of chemically fractionated material on a wide binary with a blue straggler