Unpublished conference/Abstract (Scientific congresses and symposiums)
A VLTI/AMBER closure-phase search for low-mass companions around nearby young stars: first results on beta Pictoris
Absil, Olivier; Le Bouquin, J.-B.; Chauvin, G. et al.
2010In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks.
 

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Abstract :
[en] Young stars in nearby moving groups and associations are well suited to search for low-mass companions. In addition to their brightness, their proximity gives access to small linear separations and their youth makes potential low-mass companion brighter than around older main sequence stars. We have recently started a survey of such young nearby stars with the AMBER near-infrared interferometer at the VLTI. The closure phase measurements provided by AMBER on a triplet of baselines are particularly sensitive to nearby off-axis point-like sources. In this talk, we describe the first results of this survey obtained on beta Pictoris. Thanks to a closure phase accuracy of a few 0.1 degree, we show that a 3-sigma sensitivity of about 4e-3 can be reached on the contrast of potential companions for angular separations between 0.01 and 0.2 arcsec. This translates into a companion mass of about 35 Mjup from 0.2 to 4 AU in the case of beta Pictoris. We extrapolate this result on other stars of our survey and discuss the discovery space of AMBER.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Le Bouquin, J.-B.;  Laboratoire d'Astrophysique de l'Observatoire de Grenoble
Chauvin, G.;  Laboratoire d'Astrophysique de l'Observatoire de Grenoble
Hanot, Charles ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Benisty, M.;  MPIA Heidelberg
Augereau, J.-C.;  Laboratoire d'Astrophysique de l'Observatoire de Grenoble
Lebreton, J.;  Laboratoire d'Astrophysique de l'Observatoire de Grenoble
Language :
English
Title :
A VLTI/AMBER closure-phase search for low-mass companions around nearby young stars: first results on beta Pictoris
Publication date :
25 October 2010
Event name :
In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks.
Event organizer :
University of Paris Diderot
Event place :
Paris, France
Event date :
25-29 October 2010
Audience :
International
Available on ORBi :
since 22 February 2011

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