Probing Transit Timing Variations of Three Hot-Jupiters: HATP-36b, HATP-56b, and WASP-52b

TL;DR

This study presents new transit timing observations for three hot Jupiters, analyzes their transit variations over four years, and finds no strong evidence for additional bodies in these systems.

Contribution

It provides updated ephemerides and TTV analysis for HATP-36b, HATP-56b, and WASP-52b using new and literature data, with no evidence of additional planets.

Findings

Transit timings are consistent with previous studies.

No significant TTV signals indicating additional planets.

Updated linear ephemeris for each system.

Abstract

We report the results of new transit observations for the three hot Jupiter-like planets HATP-36b, HATP-56b and WASP-52b respectively. Transit timing variations (TTVs) are presented for these systems based on observations that span the period 2016 - 2020. The data were collected with the 0.6 m telescope at Adiyaman University (ADYU60, Turkey) and the 1.0 m telescope at T\"UB\.ITAK National Observatory (TUG, Turkey). Global fits were performed to the combined light curves for each system along with the corresponding radial velocity (RV) data taken from the literature. The extracted parameters (for all three systems) are found to be consistent with the values from previous studies. Through fits to the combined mid-transit times data from our observations and the data available in the literature, an updated linear ephemeris is obtained for each system. Although a number of potential outliers are noted in the respective O-C diagrams, the majority of the data are consistent within the 3$\sigma$ confidence level implying a lack of convincing evidence for the existence of additional objects in the systems studied.