Free access article

A&A 505, L5-L8 (2009)
DOI: 10.1051/0004-6361/200912869

Letter

Infrared radial velocities of vB 10

M. R. Zapatero Osorio^{1, 2}, E. L. Martín^{1, 2, 3}, C. del Burgo⁴, R. Deshpande³, F. Rodler⁵, and M. M. Montgomery<sup>3

1</sup>  Centro de Astrobiología (CAB-CSIC), Ctra. Ajalvir km 4, 28850 Torrejón de Ardoz, Madrid, Spain
    e-mail: zapateroor@inta.es
²  Formerly at Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
³  University of Central Florida, Physics Department, PO Box 162385, Orlando, FL32816, USA
⁴  School of Cosmic Physics, Dublin Institute for Advanced Studies, Dublin 2, Ireland
⁵  Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain

Received 11 July 2009 / Accepted 25 August 2009

Abstract
We present radial velocities of the M8V-type, very low-mass star vB 10 obtained at four different epochs between 2001 and 2008. We use high-resolution (R ~ 20 000) near-infrared (J-band) spectra taken with the NIRSPEC instrument on the Keck II telescope. Our data suggest that vB 10 shows radial velocity variability with an amplitude of ~1 km s^-1, a result that is consistent with the recent finding of a massive planet companion around the star. More velocity measurements and a better sampling of the orbital phase are required to precisely constrain the orbital parameters and the individual masses of the pair.

Key words: stars: late-type -- stars: low-mass, brown dwarfs -- stars: individual: vB 10 -- techniques: radial velocities -- planetary systems -- binaries: general

© ESO 2009

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