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Forgot to mention in this thread! I have posted a barebones script to correct uncal NIRISS data using the sinusoid we infer in our paper. Would be great to try it on any NIRISS data you have lying around and see what the effects are on your data! #astro #exoplanets 🔭 github.com/shashankdhol...
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Calibrating the JWST NIRISS analog-to-digital converter periodic integral nonlinearity - shashankdholakia/niriss-cal-inl
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GitHub - shashankdholakia/niriss-cal-inl: Calibrating the JWST NIRISS analog-to-digital converter periodic integral nonlinearity
Shashank Dholakia
And finally--the transmission spectra before and after the correction (with the difference on the bottom). The most obvious effect of the sinusoidal systematic is to offset Orders 1 and 2 in NIRISS, which we estimate for WASP-39b at 55ppm. It also seemingly randomly disperses points by ~30ppm. (9/N)
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Shashank Dholakia