TrES-2: The First Transiting Planet in the Kepler Field*

Francis T. O’Donovan; David Charbonneau; Georgi Mandushev; Edward W. Dunham; David W. Latham; Guillermo Torres; Alessandro Sozzetti; Timothy M. Brown; John T. Trauger; Juan A. Belmonte; Markus Rabus; José M. Almenara; Roi Alonso; Hans J. Deeg; Gilbert A. Esquerdo; Emilio E. Falco; Lynne A. Hillenbrand; Anna Roussanova; Robert P. Stefanik; Joshua N. Winn

doi:10.1086/509123

TrES-2: The First Transiting Planet in the Kepler Field^*

Francis T. O'Donovan¹, David Charbonneau^2,3, Georgi Mandushev⁴, Edward W. Dunham⁴, David W. Latham², Guillermo Torres², Alessandro Sozzetti^2,5, Timothy M. Brown^6,7, John T. Trauger⁸, Juan A. Belmonte⁹, Markus Rabus⁹, José M. Almenara⁹, Roi Alonso¹⁰, Hans J. Deeg⁹, Gilbert A. Esquerdo^2,11, Emilio E. Falco², Lynne A. Hillenbrand¹, Anna Roussanova¹², Robert P. Stefanik², and Joshua N. Winn¹²

Published 2006 October 16 • © 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 651, Number 1 Citation Francis T. O'Donovan et al 2006 ApJ 651 L61 DOI 10.1086/509123

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Author affiliations

¹ California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125

² Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138

³ Alfred P. Sloan Research Fellow

⁴ Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001

⁵ INAF-Osservatorio Astronomico di Torino, 10025 Pino Torinese, Italy

⁶ Las Cumbres Observatory Global Telescope, 6720 Cortona Drive, Goleta, CA 93117

⁷ High Altitude Observatory, National Center for Atmospheric Research, 3080 Center Green, Boulder, CO 80301

⁸ Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109

⁹ Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain

¹⁰ Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, 13376 Marseille 12, France

¹¹ Planetary Science Institute, 1700 East Fort Lowell Road, Tucson, AZ 85719

¹² Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139

Dates

Received 2006 August 21
Accepted 2006 September 12
Published 2006 October 16

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Abstract

We announce the discovery of the second transiting hot Jupiter discovered by the Trans-atlantic Exoplanet Survey. The planet, which we dub TrES-2, orbits the nearby star GSC 03549-02811 every 2.47063 days. From high-resolution spectra, we determine that the star has T_eff = 5960 ± 100 K and log g = 4.4 ± 0.2, implying a spectral type of G0 V and a mass of 1.08 M_☉. High-precision radial velocity measurements confirm a sinusoidal variation with the period and phase predicted by the photometry, and rule out the presence of line bisector variations that would indicate that the spectroscopic orbit is spurious. We estimate a planetary mass of 1.28M_Jup. We model B, r, R, and I photometric time series of the 1.4% deep transits and find a planetary radius of 1.24R_Jup. This planet lies within the field of view of the NASA Kepler mission, ensuring that hundreds of upcoming transits will be monitored with exquisite precision and permitting a host of unprecedented investigations.

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Footnotes

*
Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among Caltech, the University of California, and NASA. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

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