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Title: Transiting exoplanets from the CoRoT space mission XVII. The hot Jupiter CoRoT-17b: a very old planet
Authors: Sz. Csizmadia, C. Moutou, M. Deleuil, J. Cabrera, M. Fridlund, D. Gandolfi, S. Aigrain, R. Alonso, J. M. Almenara, M. Auvergne, A. Baglin, P. Barge, A. S. Bonomo, P. Borde, F. Bouchy, H. Bruntt, L. Carone, S. Carpano, C. Cavarroc, W. Cochran, H. J. Deeg, R. F. Diaz, R. Dvorak, M. Endl, A. Erikson, S. Ferraz-Mello, Th. Fruth, J. C. Gazzano, M. Gillon, E. W. Guenther, T. Guillot, A. Hatzes, M. Havel, G. Hebrard, E. Jehin, L. Jorda, A. Leger, A. Llebaria, H. Lammer, C. Lovis, P. J. MacQueen, T. Mazeh, M. Ollivier, M. Paetzold, D. Queloz, H. Rauer, D. Rouan, A. Santerne, J. Schneider, B. Tingley, R. Titz-Weider, G. Wuchterl

We report on the discovery of a hot Jupiter-type exoplanet, CoRoT-17b, detected by the CoRoT satellite. It has a mass of 2.43 ±0.30 Jupiter masses and a radius of 1.02 ±0.07 Jupiter radii, while its mean density is 2.82 ±0.38 g/cm³. CoRoT-17b is in a circular orbit with a period of 3.7681 ±0.0003 days. The host star is an old (10.7 ±1.0 Gyr) main-sequence star, which makes it an intriguing object for planetary evolution studies. The planet's internal composition is not well constrained and can range from pure H/He to one that can contain ~380 earth masses of heavier elements.

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