A Search for Exotrojans in Transiting Exoplanetary systems

Abstract

We present a search for Trojan companions to 25 transiting exoplanets. We use the technique of Ford & Gaudi 2006, in which a difference is sought between the observed transit time and the transit time that is calculated by fitting a two-body Keplerian orbit to the radial-velocity data. This technique is sensitive to the imbalance of mass at the L4/L5 points of the planet-star orbit. No companions were detected. The median 2$\sigma$ upper limit is 60 Earth masses, and the most constraining limit is 2.5 Earth masses for the case of GJ 436.

To appear in Proceedings of the IAU Symposium No. 253, "Transiting Planets", May 19 - May 23, 2008, Cambridge, MA

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