Article (Scientific journals)
Deep near-infrared interferometric search for low-mass companions around β Pictoris
Absil, Olivier; Le Bouquin, Jean-Baptiste; Lebreton, Jérémy et al.
2010In Astronomy and Astrophysics, 520, p. 2
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Keywords :
stars: individual: β Pic; planets and satellites: detection; techniques: interferometric; planetary systems
Abstract :
[en] Aims. We search for low-mass companions in the innermost region (<300 mas, i.e., 6 AU) of the β Pic planetary system. Methods. We obtained interferometric closure phase measurements in the K-band with the VLTI/AMBER instrument used in its medium spectral resolution mode. Fringe stabilization was provided by the FINITO fringe tracker. Results. In a search region of between 2 and 60 mas in radius, our observations exclude at 3σ significance the presence of companions with K-band contrasts greater than 5×10^-3 for 90% of the possible positions in the search zone (i.e., 90% completeness). The median 1σ error bar in the contrast of potential companions within our search region is 1.2×10^-3. The best fit to our data set using a binary model is found for a faint companion located at about 14.4 mas from β Pic, which has a contrast of 1.8×10^-3 ± 1.1×10^-3 (a result consistent with the absence of companions). For angular separations larger than 60 mas, both time smearing and field-of-view limitations reduce the sensitivity. Conclusions. We can exclude the presence of brown dwarfs with masses higher than 29 MJup (resp. 47 MJup) at a 50% (resp. 90%) completeness level within the first few AUs around β Pic. Interferometric closure phases offer a promising way to directly image low-mass companions in the close environment of nearby young stars.
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, Jean-Baptiste
Lebreton, Jérémy
Augereau, Jean-Charles
Benisty, Myriam
Chauvin, Gaël
Hanot, Charles ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Mérand, Antoine
Montagnier, Guillaume
Language :
English
Title :
Deep near-infrared interferometric search for low-mass companions around β Pictoris
Publication date :
23 September 2010
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
520
Pages :
L2
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 October 2010

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