Paper: astro-ph/0512322
Date: Tue, 13 Dec 2005 13:03:32 GMT (71kb)

Title: Spectroscopic companions of very young brown dwarfs

Authors: Joergens Viki (Leiden Observatory)

Comments: Proceeding of ESO workshop 'Multiple Stars across the HRD' (Garching
2005). 6 pages, 4 figures
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I review here the results of the first RV survey for spectroscopic companions
to very young brown dwarfs (BDs) and (very) low-mass stars in the ChaI
star-forming cloud with UVES at the VLT. This survey studies the binary
fraction in an as yet unexplored domain not only in terms of primary masses
(substellar regime) and ages (a few Myr) but also in terms of companion masses
(sensitive down to planetary masses) and separations (< 1 AU). The UVES spectra
obtained so far hint at spectroscopic companions of a few Jupiter masses around
one BD and around one low-mass star (M4.5) with orbital periods of at least
several months. Furthermore, the data indicate a multiplicity fraction
consistent with field BDs and stellar binaries for periods < 100 days.

\\ ( http://arXiv.org/abs/astro-ph/0512322 , 71kb)