New Frontier of Exoplanetary Science: High Dispersion Coronagraphy
Ji Wang

Thousands of exoplanets have been discovered, but only a handful of them are amendable for atmospheric spectroscopic study. Spectroscopy leads to understanding of physical and chemical processes taking place in an exoplanet. Spectroscopy of exoplanets can also detect biomarkers in potential habitable planets around other stars. The high dispersion coronagraphy (HDC) provides a pathway to search for biomarkers in planets around M dwarfs with next-generation ground-based extremely large telescopes (ELTs, e.g., TMT). The HDC combines high resolution spectroscopy (HRS) with a coronagraph operating behind an extreme adaptive optics (AO) system. The coronagraph spatially filters out starlight while the HRS spectrally discriminates starlight from planet light, reaching a starlight suppression level that enables biomarker detection. I will discuss a roadmap to achieve this ambitious goal. The roadmap consists of rigorous science cases at different stages of hardware developments, from existing facilities on Mauna Kea, to the near-term upgrade, to instruments on TMT, and to future space missions such as HabEx/LUVOIR.