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We present a refined orbital solution for the components A, B, and C of thenearby late-M type multiple system LHS 1070. By combining astrometricdatapoints from NACO/VLT, CIAO/SUBARU, and PUEO/CFHT, as well as a radialvelocity measurement from the newly commissioned near infrared high-resolutionspectrograph CRIRES/VLT, we achieve a very precise orbital solution for the Band C components and a first realistic constraint on the much longer orbit ofthe A-BC system. Both orbits appear to be co-planar. Masses for the B and Ccomponents calculated from the new orbital solution (M_(B+C) = 0.157 +/- 0.009M_sun) are in excellent agreement with theoretical models, but do not matchempirical mass-luminosity tracks. The preliminary orbit of the A-BC systemreveals no mass excess for the A component, giving no indication for apreviously proposed fourth (D) component in LHS 1070.

Improved orbital solution and masses for the very low-mass multiple system LHS 1070