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

By David J Armstrong, A. Santerne, D. Veras, S. Barros, O. Demangeon, J. Lillo-Box, J. McCormac, H. Osborn, M. Tsantaki, J. Almenara and 18 more. 2015

45 citations recorded by the source corpus.

Aims. 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 similar to 22 000 objects over an 80-day timespan. We searched these data with the aim of detecting more important new objects. Methods. Our search through two separate pipelines led to the independent discovery of K2-19b and c, a two-planet system of Neptune-sized objects (4.2 and 7.2 R-circle plus), orbiting a K dwarf extremely close to the 3: 2 mean motion resonance. The two planets each show transits, sometimes simultaneously owing to their proximity to resonance and the alignment of conjunctions. Results. We obtained further ground-based photometry of the larger planet with the NITES telescope, demonstrating the presence of large transit timing variations (TTVs), and used 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 validated the planets through the PASTIS tool,

Subfields: Astronomy and Astrophysics, Instrumentation

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Citations in the corpus

STELLAR AND PLANETARY PROPERTIES OF K2 CAMPAIGN 1 CANDIDATES AND VALIDATION OF 17 PLANETS, INCLUDING A PLANET RECEIVING EARTH-LIKE INSOLATION (2015, background): “The exception, K2-19, is a two-planet system with the two planets near a 3:2 period commensurability, so in this case the “secondary” is actually the transits of the other planet.”
PLANETARY CANDIDATES FROM THE FIRST YEAR OF THE K2 MISSION (2015, background): “Armstrong et al. (2015b) and Foreman-Mackey et al. (2015) previously identified two transiting giant planet candidates around EPIC 201505350, close to a 3:2 mean motion resonance, and Armstrong et al. (2015b) confirmed their planetary nature by detecting transit timing variations.”