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Probing the impact of stellar duplicity on the frequency of giant planets: Final results of our VLT/NACO survey

Published online by Cambridge University Press:  10 November 2011

Anne Eggenberger
Affiliation:
Université Joseph Fourier – Grenoble 1 / CNRS, Laboratoire d'Astrophysique de Grenoble (UMR 5571), BP 53, 38041 Grenoble Cedex 9, France email: Anne.Eggenberger@obs.ujf-grenoble.fr, Gael.Chauvin@obs.ujf-grenoble.fr, Thierry.Forveille@obs.ujf-grenoble.fr, Jean-Luc.Beuzit@obs.ujf-grenoble.fr, Anne-Marie.Lagrange@obs.ujf-grenoble.fr
Stéphane Udry
Affiliation:
Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland email: Stephane.Udry@unige.ch, Michel.Mayor@unige.ch
Gaël Chauvin
Affiliation:
Université Joseph Fourier – Grenoble 1 / CNRS, Laboratoire d'Astrophysique de Grenoble (UMR 5571), BP 53, 38041 Grenoble Cedex 9, France email: Anne.Eggenberger@obs.ujf-grenoble.fr, Gael.Chauvin@obs.ujf-grenoble.fr, Thierry.Forveille@obs.ujf-grenoble.fr, Jean-Luc.Beuzit@obs.ujf-grenoble.fr, Anne-Marie.Lagrange@obs.ujf-grenoble.fr
Thierry Forveille
Affiliation:
Université Joseph Fourier – Grenoble 1 / CNRS, Laboratoire d'Astrophysique de Grenoble (UMR 5571), BP 53, 38041 Grenoble Cedex 9, France email: Anne.Eggenberger@obs.ujf-grenoble.fr, Gael.Chauvin@obs.ujf-grenoble.fr, Thierry.Forveille@obs.ujf-grenoble.fr, Jean-Luc.Beuzit@obs.ujf-grenoble.fr, Anne-Marie.Lagrange@obs.ujf-grenoble.fr
Jean-Luc Beuzit
Affiliation:
Université Joseph Fourier – Grenoble 1 / CNRS, Laboratoire d'Astrophysique de Grenoble (UMR 5571), BP 53, 38041 Grenoble Cedex 9, France email: Anne.Eggenberger@obs.ujf-grenoble.fr, Gael.Chauvin@obs.ujf-grenoble.fr, Thierry.Forveille@obs.ujf-grenoble.fr, Jean-Luc.Beuzit@obs.ujf-grenoble.fr, Anne-Marie.Lagrange@obs.ujf-grenoble.fr
Anne-Marie Lagrange
Affiliation:
Université Joseph Fourier – Grenoble 1 / CNRS, Laboratoire d'Astrophysique de Grenoble (UMR 5571), BP 53, 38041 Grenoble Cedex 9, France email: Anne.Eggenberger@obs.ujf-grenoble.fr, Gael.Chauvin@obs.ujf-grenoble.fr, Thierry.Forveille@obs.ujf-grenoble.fr, Jean-Luc.Beuzit@obs.ujf-grenoble.fr, Anne-Marie.Lagrange@obs.ujf-grenoble.fr
Michel Mayor
Affiliation:
Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland email: Stephane.Udry@unige.ch, Michel.Mayor@unige.ch
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Abstract

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If it is commonly agreed that the presence of a (moderately) close stellar companion affects the formation and the dynamical evolution of giant planets, the frequency of giant planets residing in binary systems separated by less than 100 AU is unknown. To address this issue, we have conducted with VLT/NACO a systematic adaptive optics search for moderately close stellar companions to 130 nearby solar-type stars. According to the data from Doppler surveys, half of our targets host at least one planetary companion, while the other half show no evidence for short-period giant planets. We present here the final results of our survey, which include a new series of second-epoch measurements to test for common proper motion. The new observations confirm the physical association of two companion candidates and prove the unbound status of many others. These results strengthen our former conclusion that circumstellar giant planets are slightly less frequent in binaries with mean semimajor axes between 35 and 100 AU than in wider systems or around single stars.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

Eggenberger, A., Udry, S., Chauvin, G., Beuzit, J. L., Lagrange, A. M., & Mayor, M. 2008, ASP-CS, 398, 179Google Scholar
Eggenberger, A., Udry, S., Chauvin, G., Beuzit, J.-L., Lagrange, A.-M., Ségransan, D., & Mayor, M. 2007, A&A, 474, 273Google Scholar