The infrared Doppler (IRD) instrument for the Subaru telescope: Instrument description and commissioning results

The Infrared Doppler (IRD) instrument is a fiber-fed high-resolution NIR spectrometer for the Subaru telescopecovering the Y,J, H-bandssimultaneously with a maximum spectral resolutionof 70,000. The main purpose of IRD is a search for Earth-massplanets around nearby M-dwarfs by precise radial velocitymeasurements, as well as a spectroscopic characterization of exoplanetatmospheres. We report the current status of the instrument, which is undergoing commissioning at the Subaru Telescope, and the first lightobservation successfully done in August 2017. The general description of the instrument will be given including spectrometer optics, fiber injection system, cryogenic system, scrambler, and laser frequency comb. A large strategic survey mainly focused on late-type M-dwarfs is planned to start from 2019.