Considerations for using Spatial Scans with WFC3

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A DETECTION OF WATER IN THE TRANSMISSION SPECTRUM OF THE HOT JUPITER WASP-12b AND IMPLICATIONS FOR ITS ATMOSPHERIC COMPOSITION (2015, background): “…scaling fac- 4 Kreidberg et al. tor S(t) is equal to 1 for exposures with forward spatial scanning and s for reverse scanning; this accounts for a small offset in normalization between the scan directions caused by the upstream-downstream effect of the detector readout (McCullough & MacKenty 2012).”
Exoplanetary Atmospheres: Key Insights, Challenges, and Prospects (2019, background): “On the other hand, the lowtemperature super-Earths and Neptunes have mostly shown flat spectra in the WFC3 bandpass (131, 124) with a few exceptions (85, 277), which indicate the predominance of clouds in low-temperature atmospheres.”
DETECTION OF H2O AND EVIDENCE FOR TiO/VO IN AN ULTRA-HOT EXOPLANET ATMOSPHERE (2016, methodology): “Spectroscopic mode was used with grism G141 and forward scanning to allow longer exposures without saturating the detector (McCullough & MacKenty 2012).”