Basic Parameters

These REACH specifications are for IRD using single-mode fibers, combined with SCExAO. Please note that the specifications of IRD on the IRD website are for multi-mode fibers (MMF) combined with only AO188 (IRD MMF mode). The detectors and the laser comb specifications are common for REACH and IRD MMF mode.

Effeciency

Parameters

Parameter	Values
Spectral Resulution	~100,000
Spectral Coverage	0.97-1.75 um
Field of View	Each fiber accepts 40 mas at 1.6um Fiber-to-fiber distance is 200 mas Fibers can be positioned at any location in the high-contrast region (2 x 2 arcsec)
Fiber	7 hexagonal packed single mode fibers (SMF) on the SCExAO focus. Light from a central fiber is fed to IRD’s SM. MCF output is connected to a photometric monitoring system.
Throughput	See the above plot. Note that 1) this throughput was obtained under 0.6 arcsec seeing condition 2) 90%:10% beam splliter was used at the time of the observation, but this beam splitter will not be used for science observation. Therefore the expected throughput should be 10% better than this value.
Wavelength Calibration	Laser comb or ThAr lamp
Instrumental RV stability	At least 2 m/s when used with the laser comb. This is from a long-term stability test of IRD with a multi-mode fiber.
RV precision	Depending on spectral type of a star, usable spectral coverage, S/N of spectrum
Detector Noise	Read-out noise ~12 e- (10min. exposure)