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Abstract:
Exoplanet science has entered a data-rich era, yet some of its most fundamental questions remain unanswered. This talk highlights three major open problems in the field: the origin of the bimodal distribution of exoplanet radii, the nature and diversity of rogue planets, and the factors that govern exoplanet habitability. Addressing these problems will require close interdisciplinary collaboration across astrophysics, planetary science, cosmology, and geochemistry. As missions such as the Jiao Tong University Spectroscopic Telescope (JUST), JWST, Twinkle, and Ariel deliver increasingly detailed observations, progress will depend not only on new data but on the integration of diverse scientific perspectives.
Biography:
Darius Modirrousta-Galian is a postdoctoral researcher in the Earth and Planetary Science Department at Yale University, specializing in theoretical exoplanetary and planetary science. He holds a Ph.D. in Physics from the University of Palermo, and a Master's in Planetary Science and a B.Sc. in Astrophysics from University College London. His research combines atmospheric, geophysical, and stellar principles to model the evolution of exoplanet atmospheres, such as atmosphere-interior interactions and atmospheric photoevaporation. He recently proposed a new model suggesting that primordial planetary atmospheres become chemically fractionated because of X-ray and ultraviolet-induced photoevaporation, transitioning from a hydrogen-rich atmosphere to a secondary heavier one over billion-year timescales. His work has resulted in over fifteen peer-reviewed publications, including eight as the first author, in international journals such as The Astrophysical Journal, Astronomy & Astrophysics, and Icarus.