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Astrometric measurements are presented for seven nearby stars with previouslydetected planets: six M dwarfs (GJ 317, GJ 667C, GJ 581, GJ 849, GJ 876, and GJ1214) and one K dwarf (BD $-$10 3166). Measurements are also presented for sixadditional nearby M dwarfs without known planets, but which are more favorableto astrometric detections of low mass companions, as well as three binarysystems for which we provide astrometric orbit solutions. Observations havebaselines of three to thirteen years, and were made as part of the RECONSlong-term astrometry and photometry program at the CTIO/SMARTS 0.9m telescope.We provide trigonometric parallaxes and proper motions for all 16 systems, andperform an extensive analysis of the astrometric residuals to determine theminimum detectable companion mass for the 12 M dwarfs not having close stellarsecondaries. For the six M dwarfs with known planets, we are not sensitive toplanets, but can rule out the presence of all but the least massive browndwarfs at periods of 2 - 12 years. For the six more astrometrically favorable Mdwarfs, we conclude that none have brown dwarf companions, and are sensitive tocompanions with masses as low as 1 $M_{Jup}$ for periods longer than two years.In particular, we conclude that Proxima Centauri has no Jovian companions atorbital periods of 2 - 12 years. These results complement previously publishedM dwarf planet occurrence rates by providing astrometrically determined uppermass limits on potential super-Jupiter companions at orbits of two years andlonger. As part of a continuing survey, these results are consistent with thepaucity of super-Jupiter and brown dwarf companions we find among the over 250red dwarfs within 25 pc observed longer than five years in our astrometricprogram.

The Solar Neighborhood. XXXIV. A Search for Planets Orbiting Nearby M Dwarfs using Astrometry