Two planets orbiting the recently formed post-common envelope binary NN Serpentis

  title={Two planets orbiting the recently formed post-common envelope binary NN Serpentis},
  author={Klaus P. Beuermann and Frederic V. Hessman and Stefan Dreizler and Thomas R. Marsh and Sarah Parsons and Don E. Winget and G. F. Miller and Matthias R. Schreiber and Wilhelm Kley and Vik S. Dhillon and Stuart P. Littlefair and C. M. Copperwheat and J. J. Hermes},
  journal={Astronomy and Astrophysics},
Planets orbiting post-common envelope binaries provide fundamental information on planet formation and evolution. We searched for such planets in NN Ser ab, an eclipsing short-period binary that shows long-term eclipse time variations. Using published, reanalysed, and new mid-eclipse times of NN Ser ab obtained between 1988 and 2010, we find excellent agreement with the light-travel-time effect produced by two additional bodies superposed on the linear ephemeris of the binary. Our multi… 

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