29 July 2016 The infrared spectrometer for Twinkle
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Abstract
Twinkle is a small satellite mission to observe the atmospheres of exoplanets in the visible to near infrared. This paper describes the design of the infrared (1.3 to 4.5 micron) spectrometer which works at the diffraction limit of the 450mm diameter telescope and at a resolving power of 300 (1.3-2.4 microns) and, in order to achieve the required SNR, R=30 for 2.4-4.5 microns. The planetary spectrum is obtained by taking differences between the spectra of star + planet at different phases of the planet’s orbit so there is an emphasis of spectral and radiometric stability. The design incorporates a number of features to enhance this stability - compact all aluminium structure and mirror substrates to reduce alignment offsets when cooled to the operating temperature of ~100K - pupil imaging in the across dispersion direction to minimise changes due to sub-pixel variations in sensitivity and reduce the number of illuminated pixels for background measurements
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Martyn Wells, Martyn Wells, "The infrared spectrometer for Twinkle", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99044N (29 July 2016); doi: 10.1117/12.2232046; https://doi.org/10.1117/12.2232046
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