One of the closest exoplanet pairs to the 3:2 mean motion resonance: K2-19b and c

David J. Armstrong, Alexandre Santerne, Dimitri Veras, Susana C. C. Barros, Olivier Demangeon, Jorge Lillo-Box, James McCormac, Hugh P. Osborn, Maria Tsantaki, José-Manuel Almenara, David Barrado, Isabelle Boisse (+15 others)
2015 Astronomy and Astrophysics  
The K2 mission has recently begun to discover new and diverse planetary systems. In December 2014 Campaign 1 data from the mission was released, providing high-precision photometry for 22000 objects over an 80 day timespan. We searched these data with the aim of detecting further important new objects. Our search through two separate pipelines led to the independent discovery of K2-19b & c, a two-planet system of Neptune sized objects (4.2 and 7.2 R_⊕), orbiting a K dwarf extremely close to the
more » ... 3:2 mean motion resonance. The two planets each show transits, sometimes simultaneously due to their proximity to resonance and alignment of conjunctions. We obtain further ground based photometry of the larger planet with the NITES telescope, demonstrating the presence of large transit timing variations (TTVs), and use the observed TTVs to place mass constraints on the transiting objects under the hypothesis that the objects are near but not in resonance. We then statistically validate the planets through the PASTIS tool, independently of the TTV analysis.
doi:10.1051/0004-6361/201526008 fatcat:xpcdqjt4xbbeljut4rusylzjye