NIRISS also offers a spectroscopic mode that is specially designed for exoplanet characterisation using transit spectroscopy, a technique that allows Webb to study the chemical composition of an exoplanet’s atmosphere when it passes in front of its host star. Unlike in an ordinary spectrograph, the light source in a slitless spectrograph is not a narrow slit. It features a slitless spectrograph, where all the light falling on the camera will be dispersed into its spectrum. It has a camera that will be usable in parallel with the NIRCam camera to provide additional imaging capabilities for Webb.
NIRISS is an innovative instrument that will support operations in three observing modes. NIRISS - the Near-InfraRed Imager and Slitless Spectrograph It was provided by the University of Arizona. NIRCam will also be the primary tool for alignment of the telescope. NIRCam also has coronagraphic and spectroscopic capabilities, which will, for example, be used to characterise exoplanets. farthest away) near-infrared images ever obtained, detecting light from the first stars and galaxies. Taking advantage of Webb’s exquisite image quality and large primary mirror, the instrument will acquire some of the deepest (i.e.
Webb’s NIRCam is the observatory’s primary camera, and will simultaneously image the cosmos in two different infrared ranges.
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