PRISMATICO

PRISMATICO is a scientific project led by Dr Ján Šubjak at the Astronomical Institute of the Czech Academy of Sciences, in collaboration with the University of Tokyo.

The project focuses on how stellar activity affects the observed properties of transiting exoplanets. Starspots, faculae, rotational variability, and unresolved stellar contamination can change the measured depth of a planetary transit and bias the inferred planetary radius, density, and atmospheric properties.

PRISMATICO combines TESS and PLATO photometry, multi-color photometry, and high-resolution spectroscopy to identify these effects and improve the reliability of exoplanet characterization.

The project aims to:

• detect activity-induced changes in transit depths,

• connect photometric variability with spectroscopic activity indicators,

• prepare activity-aware follow-up strategies for planets discovered by TESS and PLATO.