The Mid-Infrared Instrument for the James Webb Space Telescope, IV: The Low-Resolution Spectrometer
2015
The Low Resolution Spectrometer of the
MIRI, which forms part of the imager module, will provide R~100 long-slit and slitless spectroscopy from 5 to 12 micron. The design is optimised for observations of compact sources, such as
exoplanethost stars. We provide here an overview of the design of the LRS, and its performance as measured during extensive test campaigns, examining in particular the delivered image quality, dispersion, and resolving power, as well as spectrophotometric performance, flatfield accuracy and the effects of fringing. We describe the operational concept of the slitless mode, which is optimally suited to transit spectroscopy of
exoplanetatmospheres. The LRS mode of the
MIRIwas found to perform consistently with its requirements and goals.
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