A Search for Temporal Atmospheric Variability of Kepler and TESS Hot Jupiters

We perform a systematic search for atmospheric variability in 53 Kepler and 237 TESS hot Jupiters, by looking for temporal variability of their secondary eclipse depths. This is motivated by a recent detection of such variability in KELT-1 b between TESS Sectors 17 and 57. A few of the planets show marginal variability in the form of a sudden increase/drop in the secondary eclipse depth during a single quarter/sector. Our sample is exhaustive of hot Jupiters with a detectable secondary eclipse in Kepler and TESS data, and the absence of detected clear secondary eclipse variability suggests that variations in weather are rare or perhaps unique to brown dwarfs like KELT-1 b. This work is an extension of Li and Shporer (2024).