Bibcode
Cardoso, C. V.; McCaughrean, M. J.; King, R. R.; Close, L. M.; Scholz, R.-D.; Lenzen, R.; Brandner, W.; Lodieu, N.; Zinnecker, H.
Referencia bibliográfica
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings, Volume 1094, pp. 509-512 (2009).
Fecha de publicación:
2
2009
Número de citas
14
Número de citas referidas
13
Descripción
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.