Hierarchical triple star systems towards the Galactic Bulge through OGLE's eye
Tamás Hajdu
Konkoly Observatory

Search for hierarchical stellar systems is essential to understand the orbital evolution of the close binary systems but also to study their life. The Optical Gravitational Lensing Experiment (OGLE) with its around half million eclipsing binary candidates is an excellent survey for the search for triple systems with eclipse timing variation (ETV) analyses. We have identified around 1000 potential triple (or multiple) system candidates. In addition, we determined the orbital parameters and we carried out statistical analyses of the properties of the candidates. I will review our OGLE ETV projects with some updated information.

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