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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308826.0, MPI für Astronomie / Publikationen_mpia
A Hubble Space Telescope Advanced Camera for surveys search for brown dwarf binaries in the Pleiades open cluster
Authors:Bouy, H.; Moraux, E.; Bouvier, J.; Brandner, W.; Martín, E. L.; Allard, F.; Baraffe, I.; Fernández, M.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:The Astrophysical Journal
Start Page:1056
End Page:1066
Audience:Not Specified
Abstract / Description:We present the results of a high-resolution imaging survey for brown dwarf binaries in the Pleiades open cluster. The observations were carried out with the Advanced Camera for Surveys (Pavlovsky and coworkers) on board the Hubble Space Telescope. Our sample consists of 15 bona fide brown dwarfs. We confirm two binaries and detect their orbital motion, but we did not resolve any new binary candidates in the separation range between 5.4 and 1700 AU and masses in the range 0.035-0.065 Msolar. Together with the results of our previous study (Martín and coworkers), we can derive a visual binary frequency of 13.3+13.7-4.3% for separations greater than 7 AU, masses in the range 0.055-0.065 Msolar, and mass ratios in the range 0.45-0.9<q<1.0. The other observed properties of Pleiades brown dwarf binaries (distributions of separation and mass ratio) appear to be similar to their older counterparts in the field.
Free Keywords:Stars: Binaries: General; Galaxy: Globular Clusters: General; globular clusters: individual (M45); globular clusters: individual (Pleiades); Stars: Low-Mass; Brown Dwarfs; Stars: Luminosity Function; Mass Function
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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