Using the OWL@OUKA telescope to follow-up the TESS planet candidates: first results

The OWL@OUKA is the Optical Wide-field patroL (OWL) facility designed and built by Korea Astronomy and Space Science Institute (KASI) and installed in 2015 at Oukaimeden Observatory. For the first time we used the opportunities offered by this instrument for the detection and monitoring the exoplanets by the transit method. In this work, we present, first, the validation of the OWL@OUKA for the transit method by reporting the observations we have done to calibrate the instrument in order to chose the best exposure time for a given star. We report on the results obtained form the first observations, in V filter, of a known transit event of the planet Qatar-1b, a hot Jupiter orbiting a metal-rich K dwarf star (Teff = 5013.0, Vmag = 12.84). We have used the software AstroImagJ to reduce the data and the software EXOFASTv2 to fit the transit and extract the planetary parameters, where we obtained a transit depth 0.0207^+0.0044 _-0.0040 and a planetary radius of 1.09 +/- 0.11 RJ , that are in good consistence with the discovery paper. Given the good results obtained, we moved to the second stage of our program, which consists of tracking TESS candidates.