The InfraRed Doppler (IRD) spectrograph can provide high-resolution (R > 70,000) spectra over 1000-1700 nm with stable wavelength calibrations thanks to a dedicated laser frequency comb. Since the first science operation on the Subaru 8.2-m Telescope in 2018, IRD has been extensively used for observations, in which the main field is exoplanet but some studies cover the fields of Galaxy evolution and compact object. One of the main outputs is the discovery of a super-Earth close to the habitable zone of cool M dwarf Ross 508. IRD was also used to constrain the masses of many planets identified with TESS, and to identify the atomic/molecular features of transiting planets. Recently, the extreme adaptive optics system, SCExAO, can be combined with IRD to directly characterize a substellar companion with high-contrast and high-resolution spectroscopy. We here highlight and summarize the outputs obtained via the six-year operation of IRD.
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