Detectability of water vapor on terrestrial exoplanets around GK stars with Tianlin

China has proposed a space telescope with aperture size of 6.6 meters named Tianlin, which is dedicated for the characterization of rocky planets in the habitable zones (HZ) around nearby GK stars. It will be equipped with a low to high resolution spectrograph and a high contrast coronagraph that should allow the delivery of high quality spectrum of exoplanets. We conduct a preliminary simulation of transmission and reflected spectra for Earth-like planets around G, K type stars and perform retrieval analysis of the detectablity of H2O, a key bio-indicating molecule. Our results show that Tianlin has the ability to constrain H2O abundances in the atmosphere of Earth-like planets in most cases.