CAOSP abstracts, Volume: 49, No.: 2, year: 2019

Abstract: The continuous photometric monitoring within the original Kepler mission allowed for the identification of a number of eclipsing binaries that display considerable eclipse timing variations (ETV). In their work on candidate triple systems in the Kepler field Conroy et al. (2014) drew a selection of 31 systems with ETV curves, whose shapes within the 1400-day monitoring period are seemingly parabolic. There are several possible explanations, including mass transfer, the Applegate effect, and a third component with a period considerably longer than 1400 days. We tried to determine the cause of the parabolic ETV curves by timing minima of 8 systems from this selection in 2017 and 2018, thus checking whether the ETV curves preserve their parabolic shapes or show signs of periodicity a further 1500 days after the original Kepler data. Results from the 30 cm IRIDA-South and the 50/70 cm Schmidt telescopes at the Rozhen observatory (Bulgaria) are presented.