Transiting exoplanets from the CoRoT space mission XVII. The hot Jupiter   CoRoT-17b: a very old planet
  We report on the discovery of a hot Jupiter-type exoplanet, CoRoT-17b, detected by the CoRoT satellite. It has a mass of $2.43\pm0.30$\Mjup and a radius of $1.02\pm0.07$\Rjup, while its mean density is $2.82\pm0.38$ g/cm$^3$. CoRoT-17b is in a circular orbit with a period of $3.7681\pm0.0003$ days. The host star is an old ($10.7\pm1.0$ 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 $\sim$380 earth masses of heavier elements. 
Sz. Csizmadia, C. Moutou, M. Deleuil, J. Cabrera, M. Fridlund, D.   Gandolfi, S. Aigrain, R. Alonso, J. M. Almenara, M. Auve...
astro-ph.EP