Interferometric Astrometry of Proxima Centauri and Barnard's Star Using HUBBLE SPACE TELESCOPE Fine Guidance Sensor 3: Detection Limits for Substellar Companions

@article{Benedict1999InterferometricAO,
  title={Interferometric Astrometry of Proxima Centauri and Barnard's Star Using HUBBLE SPACE TELESCOPE Fine Guidance Sensor 3: Detection Limits for Substellar Companions},
  author={G. Fritz Benedict and Barbara E. Mcarthur and D.W.G. Chappell and Edmund P. Nelan and William H. Jefferys and William F. van Altena and J. T. Lee and David Elbaz Cornell and Peter John Shelus and Paul D. Hemenway and Otto G. Franz and Lawrence H. Wasserman and Raynor Lockwood Duncombe and Darrell B. Story and Arthur L. Whipple and Laurence W. Fredrick},
  journal={The Astronomical Journal},
  year={1999},
  volume={118},
  pages={1086 - 1100}
}
We report on a substellar-companion search utilizing interferometric fringe-tracking astrometry acquired with Fine Guidance Sensor 3 on the Hubble Space Telescope. Our targets were Proxima Centauri and Barnard's star. We obtain absolute parallax values of πabs = 0.″7687 ± 0.″0003 for Proxima Cen and πabs = 0.″5454 ± 0.″0003 for Barnard's star. Once low-amplitude instrumental systematic errors are identified and removed, our companion detection sensitivity is less than or equal to one Jupiter… 

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