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The EXtreme PREcision Spectrograph (EXPRES) is an optical fiber fed echelleinstrument being designed and built at the Yale Exoplanet Laboratory to beinstalled on the 4.3-meter Discovery Channel Telescope operated by LowellObservatory. The primary science driver for EXPRES is to detect Earth-likeworlds around Sun-like stars. With this in mind, we are designing thespectrograph to have an instrumental precision of 15 cm/s so that the on-skymeasurement precision (that includes modeling for RV noise from the star) canreach to better than 30 cm/s. This goal places challenging requirements onevery aspect of the instrument development, including optomechanical design,environmental control, image stabilization, wavelength calibration, and dataanalysis. In this paper we describe our error budget, and instrumentoptomechanical design.

EXPRES: A Next Generation RV Spectrograph in the Search for Earth-like Worlds