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It is plausible that most of the Stars in the Milky Way (MW) Galaxy, like theSun, consist of planetary systems, instead of a single planet. Out of theestimately discovered 3,950 planet-hosting stars, about 860 of them are knownto be multiplanetary systems (as of March, 2023). Gravitational microlensing,which is the magnification in the light of a source star, due to a single orseveral lenses, has proven to be one of the most useful Astrophysical phenomenawith many applications. Until now, many extrasolar planets (exoplanets) havebeen discovered through binary microlensing, where the lens system consists ofa star with one planet. In this paper, we discuss and explore the detection ofmulti-planetary systems that host two exoplanets via microlensing. This is donethrough the analysis and modeling of possible triple lens configurations (onestar and two planets) of a microlensing event. Furthermore, we examinedifferent magnifications and caustic areas of the second planet, by comparingthe magnification maps of triple and binary models in different settings. Wealso discuss the possibility of detecting the corresponding light curves ofsuch planetary systems with the future implementation of the Nancy Grace Roman(Roman) Space Telescope and its Galactic Time Domain survey.

Detecting Multi-Planetary Systems with Gravitational Microlensing and the Roman Space Telescope