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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 447973.0, MPI für Astronomie / Publikationen_mpia
Dynamical masses for the nearest brown dwarf binary: ε Indi Ba, Bb
Authors:Cardoso, C. V.; McCaughrean, M. J.; King, R. R.; Close, L. M.; Scholz, R. D.; Lenzen, R.; Brandner, W.; Lodieu, N.; Zinnecker, H.
Language:English
Publisher:AIP, Springer
Place of Publication:New York
Date of Publication (YYYY-MM-DD):2009
Title of Proceedings:Cool Stars, Stellar Systems and the Sun
Start Page:509
End Page:512
Title of Series:AIP Conference Proceedings
Volume (in Series):1094
Name of Conference/Meeting:15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present preliminary astrometric results for the closest known brown dwarf binary to the Sun: V Indi Ba, Bb at a distance of 3.626 pc. With ongoing monitoring of the relative separation of the two brown dwarfs (spectral types T1 and T6) with VLT NACO near-IR adaptive optics system since June 2004, we obtain a model-independent dynamical total mass for the system of 121 MJup, some 60% larger than the one obtained by McCaughrean et al., implying that the system may be as old as 5 Gyr. We have also been monitoring the absolute astrometric motions of the system using the VLTFORS2 optical imager since August 2005 to determine the individual masses. We predict a periastron passage in early 2010, by which time the system mass will be constrained to <1 MJup and we will be able to determine the individual masses accurately in a dynamical, model-independent manner.
Free Keywords:celestial mechanics; astrometry; stars
Comment of the Author/Creator:Date: 2009, February 1, 2009
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISBN:978-0735406278 [ID No:1]
URL:http://adsabs.harvard.edu/abs/2009AIPC.1094..509C [ID No:2]
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