VSPEC (Variable Star PhasE Curve) simulates exoplanet observations. It combines NASA’s Planetary Spectrum Generator (PSG) with a custom variable star model. Originally built to simulate the infrared excess of non-transiting planets, VSPEC supports transit, eclipse, phase curve geometries as well as spots, faculae, flares, granulation, and the transit light source effect.
https://ui.adsabs.harvard.edu/abs/2025A%2526C....5000890J ; also see https://github.com/VSPEC-collab/VSPEC/blob/main/CITATION.cff