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HISPEC (High-resolution Infrared Spectrograph for Exoplanet Characterization)is a proposed diffraction-limited spectrograph for the W.M. Keck Observatory,and a pathfinder for the MODHIS facility project (Multi-ObjectDiffraction-limited High-resolution Infrared Spectrograph) on the Thirty MeterTelescope. HISPEC/MODHIS builds on diffraction-limited spectrograph designswhich rely on adaptively corrected single-mode fiber feeds. Seeing-limitedhigh-resolution spectrographs, by virtue of the conservation of beam etendue,grow in volume following a D^3 power law (D is the telescope diameter), and aresubject to daunting challenges associated with their large size.Diffraction-limited spectrographs fed by single mode fibers are decoupled fromthe telescope input, and are orders of magnitude more compact and haveintrinsically stable line spread functions. Their efficiency is directlyproportional to the performance of the adaptive optics (AO) system. AOtechnologies have matured rapidly over the past two decades and are baselinedfor future extremely large telescopes. HISPEC/MODHIS will take R>100,000spectra of a few objects in a 10" field-of-view sampled at the diffractionlimit (~10-50 mas), simultaneously from 0.95 to 2.4 microns (y-K). Thescientific scope ranges from exoplanet infrared precision radial velocities,spectroscopy of transiting, close-in, and directly imaged exoplanets(atmospheric composition and dynamics, RM effect, spin measurements, Dopplerimaging), brown dwarf characterization, stellar physics/chemistry,proto-planetary disk kinematics/composition, Solar system, extragalacticscience, and cosmology. HISPEC/MODHIS features a compact, cost-effective designoptimized to fully exploit the existing Keck-AO and future TMT-NFIRAOSinfrastructures and boost the scientific reach of Keck Observatory and TMT soonafter first light.

High-resolution Infrared Spectrograph for Exoplanet Characterization with the Keck and Thirty Meter Telescopes