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Multiplicity of Young Brown Dwarfs in Cha I

  • Conference paper
The Origins of Stars and Planets: The VLT View

Part of the book series: ESO Astrophysics Symposia ((ESO))

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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.

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Author information

Authors and Affiliations

  1. Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstr. 1, D-85748, Garching, Germany

    Viki Joergens, Ralph Neuhäuser & Nuria Huélamo

  2. Thüringer Landessternwarte Tautenburg, Karl-Schwarzschild-Observatorium, Sternwarte 5, D-07778, Tautenburg, Germany

    Eike Guenther

  3. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748, Garching, Germany

    Fernando Comerón, João Alves & Wolfgang Brandner

Authors
  1. Viki Joergens
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  2. Eike Guenther
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  3. Ralph Neuhäuser
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  4. Fernando Comerón
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  5. Nuria Huélamo
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  6. João Alves
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  7. Wolfgang Brandner
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Editor information

Editors and Affiliations

  1. European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748, Garching, Germany

    João F. Alves

  2. Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482, Potsdam, Germany

    Mark J. McCaughrean

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© 2002 Springer-Verlag Berlin Heidelberg

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Joergens, V. et al. (2002). Multiplicity of Young Brown Dwarfs in Cha I. In: Alves, J.F., McCaughrean, M.J. (eds) The Origins of Stars and Planets: The VLT View. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-40277-1_16

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  • DOI: https://doi.org/10.1007/978-3-662-40277-1_16

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-39255-3

  • Online ISBN: 978-3-662-40277-1

  • eBook Packages: Springer Book Archive

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