The Palomar High-precision Astrometric Search for Exoplanet Systems monitored 51 subarcsecond binary systems to evaluate whether tertiary companions as small as Jovian planets orbited either the primary or secondary stars, perturbing their otherwise smooth Keplerian motions. Six binaries are presented that show evidence of substellar companions orbiting either the primary or secondary star. Of these six systems, the likelihoods of two of the detected perturbations to represent real objects are considered to be "high confidence", while the remaining four systems are less certain and will require continued observations for confirmation.
@article{arxiv.1010.4048,
title = {The PHASES Differential Astrometry Data Archive. V. Candidate Substellar Companions to Binary Systems},
author = {Matthew W. Muterspaugh and Benjamin F. Lane and S. R. Kulkarni and Maciej Konacki and Bernard F. Burke and M. M. Colavita and M. Shao and William I. Hartkopf and Alan P. Boss and M. Williamson},
journal= {arXiv preprint arXiv:1010.4048},
year = {2015}
}