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Observations of exoplanet systems have revealed the presence of large-scale winds in the atmospheres of exoplanets, through the measurement of offsets of the bright spot in phase-curves and velocity signatures in high-resolution transmission spectra. What is more, for some planets the location of the peak of the phase-curve has been found to vary with time, indicating the presence of e.g., storms.

Ground-based observations of secondary eclipses of the ultra-hot Jupiter WASP-12b have been found to be differ significantly, and, if real, would indicate temperature changes in the day-side of this planet of over 300K. We present the first phase-curve of WASP-12b at red optical wavelengths obtained from data from the TESS mission. Our results show no significant variability over the ~28 days of TESS observations. Furthermore the observations have revealed the peak of the phase-curve to be offset towards the evening terminator.

In addition to the TESS observations, we will also present preliminary results from a ground-based campaign across multiple observatories to investigate the observed variability of the eclipse depth of WASP-12b over different time-scales.

Variability in Exoplanet Atmospheres