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Published August 1, 2007 | Published
Journal Article Open

The Transit Light Curve (TLC) Project. VI. Three Transits of the Exoplanet TrES-2


Of the nearby transiting exoplanets that are amenable to detailed study, TrES-2 is both the most massive and the one with the largest impact parameter. We present z-band photometry of three transits of TrES-2. We improve on the estimates of the planetary, stellar, and orbital parameters, in conjunction with the spectroscopic analysis of the host star by Sozzetti and coworkers. We find the planetary radius to be Rp = 1.222 ± 0.038 RJup and the stellar radius to be R* = 1.003 ± 0.027 R☉. The quoted uncertainties include the systematic error due to the uncertainty in the stellar mass (M* = 0.980 ± 0.062 M☉). The timings of the transits have an accuracy of 25 s and are consistent with a uniform period, thus providing a baseline for future observations with the NASA Kepler satellite, whose field of view will include TrES-2.

Additional Information

© 2007. The American Astronomical Society. Received 2007 March 20; accepted 2007 April 20. Print publication: Issue 2 (2007 August 1). We thank E. Falco for accommodating our observing schedule changes. KeplerCam was developed with partial support from the Kepler mission under NASA Cooperative Agreement NCC2-1390 (PI: D. Latham), and the KeplerCam observations described in this paper were partly supported by grants from the Kepler mission to SAO and PSI. N.M.J.H. acknowledges support for this work NASA Origins grant NG06GH69G. Work by F.T.O'D. and D.C. was supported by NASA under grant NNG05GJ29G, issued through the Origins of Solar Systems Program. A.S. gratefully acknowledges the Kepler mission for partial support under NASA Cooperative Agreement NCC 2-1390. G.T. acknowledges partial support for this work from NASA Origins grant NNG04LG89G.

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