@inproceedings{20c035272252437ebcc40cdfd8b1f44a,
title = "Multiplicity of Young Brown Dwarfs in Cha I",
abstract = "How frequent are brown dwarf binaries? Do brown dwarfs have planets? Are current theoretical pre-main-sequence evolutionary tracks valid down to the substellar regime? - Any detection of a companion to a brown dwarf takes us one step forward towards answering these basic questions of star formation. We report here on a search for spectroscopic and visual companions to young brown dwarfs in the Cha I star forming cloud. Based on spectra taken with UVES at the VLT, we found significant radial velocity (RV) variations for five bona-fide and candidate brown dwarfs in Cha I. They can be caused by either a (substellar or planetary) companion or stellar activity. A companion causing the detected RV variations would have about a few Jupiter masses. We are planning further UVES observations in order to explore the nature of the detected RV variations. We also found that the RV dispersion is only ˜2 km/s indicating that there is probably no run-away brown dwarf among them. Additionally a search for companions by direct imaging with the HST and SOFI (NTT) has yielded to the detection of a few companion candidates in larger orbits.",
author = "Viki Joergens and Eike Guenther and Ralph Neuh{\"a}user and Fernando Comer{\'o}n and Nuria Hu{\'e}lamo and Jo{\~a}o Alves and Wolfgang Brandner",
year = "2002",
doi = "10.1007/10856518_16",
language = "English",
isbn = "978-3-540-43541-9",
series = "ESO Astrophysics Symposia",
publisher = "Springer-Verlag Berlin-Heidelberg",
pages = "127",
editor = "{Alves }, {Jo{\~a}o F.} and McCaughrean, {Mark J. }",
booktitle = "The Origin of Stars and Planets: The VLT View",
}