Coordinated X-ray and Optical observations of Star-Planet Interaction in HD 17156

  title={Coordinated X-ray and Optical observations of Star-Planet Interaction in HD 17156},
  author={Antonio Maggio and Ignazio Pillitteri and Gaetano Scandariato and Antonino F. Lanza and Salvatore Sciortino and F. Borsa and Aldo S. Bonomo and Riccardo Claudi and E. Covino and Silvano Desidera and Raffaele Gratton and G. Micela and Isabella Pagano and Giampaolo Piotto and Alessandro Sozzetti and R.Cosentino and J. Maldonado},
  journal={arXiv: Solar and Stellar Astrophysics},
The large number of close-in Jupiter-size exoplanets prompts the question whether star-planet interaction (SPI) effects can be detected. We focused our attention on the system HD 17156, having a Jupiter-mass planet in a very eccentric orbit. Here we present results of the XMM-Newton observations and of a five months coordinated optical campaign with the HARPS-N spectrograph. We observed HD 17156 with XMM-Newton when the planet was approaching the apoastron and then at the following periastron… 

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