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The Binarity Status of Stars with and without Planets Probed with VLT/NACO

Published online by Cambridge University Press:  22 February 2018

S. Udry ,
A. Eggenberger ,
J.-L. Beuzit ,
A.-M. Lagrange ,
M. Mayor  and
G. Chauvin
S. Udry
Affiliation:
Geneva Observatory, ch des Maillettes 51, 1290-Sauverny, Switzerland. emails: stephane.udry, anne.eggenberger, michel.mayor@obs.unige.ch
A. Eggenberger
Affiliation:
Geneva Observatory, ch des Maillettes 51, 1290-Sauverny, Switzerland. emails: stephane.udry, anne.eggenberger, michel.mayor@obs.unige.ch
J.-L. Beuzit
Affiliation:
Laboratoire d’Astrophysique, Observatoire de Grenoble, 414 rue de la piscine, St-Martin d’Hères, Franceemails: Jean-Luc.Beuzit, Anne-Marie. Lagrange, gael.chauvin@obs.ujf-grenoble.fr
A.-M. Lagrange
Affiliation:
Laboratoire d’Astrophysique, Observatoire de Grenoble, 414 rue de la piscine, St-Martin d’Hères, Franceemails: Jean-Luc.Beuzit, Anne-Marie. Lagrange, gael.chauvin@obs.ujf-grenoble.fr
M. Mayor
Affiliation:
Geneva Observatory, ch des Maillettes 51, 1290-Sauverny, Switzerland. emails: stephane.udry, anne.eggenberger, michel.mayor@obs.unige.ch
G. Chauvin
Affiliation:
Laboratoire d’Astrophysique, Observatoire de Grenoble, 414 rue de la piscine, St-Martin d’Hères, Franceemails: Jean-Luc.Beuzit, Anne-Marie. Lagrange, gael.chauvin@obs.ujf-grenoble.fr

Abstract

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The properties of planets orbiting a component of a binary or multiple-star system appear different from the ones of planets orbiting isolated stars (Udry et al. 2004). The effect of binarity has, however, still to be better characterized and quantified. In this contribution, we describe a VLT/NACO adaptive optics survey aimed at pointing out the potential effect of stellar duplicity on planet formation and evolution, by comparing the faint-companion statistics of similarly selected subsamples of stars with and without planets. The statistical results of the survey will allow us to possiblydiscriminate between the proposed models of planetary formation (accretion or disk instability), some of them predicting different influences of stellar duplicity. Preliminary results are already very interesting: 20 ± 7% of the “single” stars present companions within ~10″, whereas only 3 ± 3% equivalent companions are found close to stars hosting planets.

Resumen

Resumen

Las propiedades de los planetas en órbita alrededor de una componente de una estrella binaria o múltiple son distintas a las de los planetas de las estrellas aisladas (Udry et al., 2004). Describimos un sondeo con la óptica adaptativa VLT/NACO que intenta estudiar el efecto de la duplicidad estelar en la formación y evolución de los planetas, comparando la estadística de las compañeras débiles en muestras de estrellas con y sin planetas, seleccionadas en forma similar. Los resultados nos permitirán discriminar entre los modelos para la formación de planetas (acreción o inestabilidad del disco). Los resultados preliminares son muy interesantes: el 20 ± 7% delas estrellas “sencillas” tienen compañeras dentro de ~ 10″, mientras que sólo el 3 ± 3% de compañeras equivalentes se encuentran cerca de las estrellas que albergan.

Keywords

StarsPlanetary Systems — TechniquesHigh Angular Resolution
Type
Companions of Very Low Mass
Information
International Astronomical Union Colloquium , Volume 191: The Environment and Evolution of Double and Multiple Stars , August 2004 , pp. 215 - 216
Copyright
Copyright © Instituto de Astronomia – Mexico 2004

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