Transit Timing Variations and Transmission Spectroscopic Studies of Seven Exoplanets with Thai Telescopes

Since 2012, National Astronomical Research Institute of Thailand (NARIT) has operated the 2.4 metre Thai National Telescope and seven 0.5-0.7 metre class telescopes of the Thai Robotic Telescopes network, located in Thailand, Chile, China, USA and Australia. As a part of collaborations with the Spectroscopy and Photometry of Exoplanetary Atmospheres Research Network (SPEARNET), seven transitting exoplanets: HAT-P-26b, HAT-P-36b, HAT-P-43b, KELT-3b, WASP-11b/HAT-P-10b, WASP-43b and WASP-127b, were monitored with Thai telescopes from 2015 to 2019. Transit Timing Variations (TTV) and transmission spectroscopic analyses are performed on multi-wavelength optical photometric observational data, yielding results which indicate interesting properties of monitered exoplanets. TTV analysis of WASP-43b shows that the case of orbital decay can be ruled out, while in WASP-127b a significant Rayleigh scattering effect is confirmed through transmission spectroscopic analysis of u'-band light curves. Moreover, TTV analyses of two planets with large TTVs: HAT-P-26b and HAT-P-43b, have been performed in order to verify results published in the previous works. The first optical transmission spectroscopic analyses of two hot-Jupiters HAT-P-36b and WASP-11b/HAT-P-10b are also carried out.