Reference : A VLTI/AMBER closure-phase search for low-mass companions around nearby young stars: fir...
Scientific congresses and symposiums : Unpublished conference
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/58041
A VLTI/AMBER closure-phase search for low-mass companions around nearby young stars: first results on beta Pictoris
English
Absil, Olivier mailto [Université de Liège - ULg > 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 - ULg > 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]
25-Oct-2010
No
No
International
In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks.
25-29 October 2010
University of Paris Diderot
Paris
France
[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.
Researchers
http://hdl.handle.net/2268/58041
also: http://hdl.handle.net/2268/109542
http://adsabs.harvard.edu/abs/2010lyot.confE..13A

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