S19A0074

Planetary radial velocity (PRV) has been measured in several exoplanetary systems. PRV measurements by high dispersion spectroscopy are recognized as a promising approach, because this technique can provide us unique informations, such as dynamical stellar and planetary mass, molecules in the planetary atmosphere, atmospheric structures, and so on. UV absorbers (e.g. TiO/VO) have a key role in the upper planetary atmosphere by inducing a thermal inversion layer. These molecules have been detected only in super hot-Jupiters, and this might be due to "cold-trap effect". To investigate this scenario and the universality of TiO, we have conducted PRV measurements and detected TiO in the atmosphere of a super hot-Jupiter (T ∼ 3150K) WASP-33b with Subaru/HDS. Here we propose PRV measurements of two hot-Jupiters. The dayside temperatures of our targets are lower than WASP-33b and higher than most of hot Jupiters with no inversion signature, thus these are quite unique samples for understanding the thermal structure of exoplanetary atmosphere. We need NIR observations with high wavelength resolution for sufficient signal per noise ratio and robust molecular detection, therefore Subaru/IRD is a suitable approach for our goals.


This document was translated from LATEX by HEVEA.