Title

A Hubble Space Telescope advanced camera for surveys search for brown dwarf binaries in the Pleiades open cluster

Authors

Authors

H. Bouy; E. Moraux; J. Bouvier; W. Brandner; E. L. Martin; F. Allard;I. Baraffe

Comments

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Abbreviated Journal Title

Astrophys. J.

Keywords

binaries : general; globular clusters : general; globular clusters :; individual (M45, Pleiades); stars : low-mass, brown dwarfs; stars :; luminosity function, mass function; LOW-MASS STARS; MULTIPLICITY; PERIODS; VARIABILITY; POPULATION; STATISTICS; MEMBERSHIP; VELOCITIES; EVOLUTION; DISCOVERY; Astronomy & Astrophysics

Abstract

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 M-circle dot. Together with the results of our previous study (Martin and coworkers), we can derive a visual binary frequency of 13.3(-4.3)(+13.7)% for separations greater than 7 AU, masses in the range 0.055-0.065 M-circle dot, 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.

Journal Title

Astrophysical Journal

Volume

637

Issue/Number

2

Publication Date

1-1-2006

Document Type

Article

Language

English

First Page

1056

Last Page

1066

WOS Identifier

WOS:000235131600046

ISSN

0004-637X

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