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Multiplicity of young brown dwarfs in Cha I | | V. Joergens
; E. Guenther
; R. Neuhäuser
; F. Comerón
; N. Huélamo
; J. Alves
; Wolfgang Brandner
; | | Date: |
11 Jun 2001 | | Subject: | astro-ph | | Affiliation: | MPE Garching), E. Guenther (TLS Tautenburg), R. Neuhäuser (MPE Garching), F. Comerón (ESO, Garching), N. Huélamo (MPE Garching), J. Alves (ESO, Garching), Wolfgang Brandner (ESO, Garching | | 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 ~ 2km/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. | | Source: | arXiv, astro-ph/0106185 | | Services: | Forum | Review | PDF | Favorites | |
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