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We present a search for Trojan companions to 25 transiting exoplanets. We usethe technique of Ford & Gaudi, in which a difference is sought between theobserved transit time and the transit time that is calculated by fitting atwo-body Keplerian orbit to the radial-velocity data. This technique issensitive to the imbalance of mass at the L4/L5 points of the planet-starorbit. No companions were detected above 2\sigma confidence. The median 2\sigmaupper limit is 56 M_\earth, and the most constraining limit is 2.8 M_\earth forthe case of GJ 436. A similar survey using forthcoming data from the Keplersatellite mission, along with the radial-velocity data that will be needed toconfirm transit candidates, will be sensitive to 10-50 M_\earth Trojancompanions in the habitable zones of their parent stars. As a by-product ofthis study, we present empirical constraints on the eccentricities of theplanetary orbits, including those which have previously been assumed to becircular. The limits on eccentricity are of interest for investigations oftidal circularization and for bounding possible systematic errors in themeasured planetary radii and the predicted times of secondary eclipses.

Empirical Constraints on Trojan Companions and Orbital Eccentricities in 25 Transiting Exoplanetary Systems