CoRoT LRa02_E2_0121: Neptune-size planet candidate turns into a   hierarchical triple system with a giant primary
  This paper presents the case of CoRoT LRa02_E2_0121, which was initially classified as a Neptune-size transiting-planet candidate on a relatively wide orbit of 36.3 days. Follow-up observations were performed with UVES, Sandiford, SOPHIE and HARPS. These observations revealed a faint companion in the spectra. To find the true nature of the system we derived the radial velocities of the faint companion using TODMOR - a two-dimensional correlation technique, applied to the SOPHIE spectra. Modeling the lightcurve with EBAS we discovered a secondary eclipse with a depth of ~0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02_E2_0121 is a hierarchical triple system with an evolved G-type primary and an A-type:F-type grazing eclipsing binary. Such triple systems are difficult to discover. 
L. Tal-Or, A. Santerne, T. Mazeh, F. Bouchy, C. Moutou, R. Alonso, D.   Gandolfi, S. Aigrain, M. Auvergne, P. Barge, A. S. B...
astro-ph.EP astro-ph.SR