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The inner region of circumstellar discs makes an extra near-infrared emission(NIR bump). Detecting and studying these NIR bumps from nearby stars have beendone mostly through infrared interferometry. In this work, we study thefeasibility of detecting NIR bumps for Galactic bulge stars throughmicrolensing from observations by The Nancy Grace Roman Space Telescope (RST)survey. We first simulate microlensing light curves from source stars withdiscs in near-infrared. Four main conclusions can be extracted from thesimulations. (i) If the lens is crossing the disc inner radius, two extra andwide peaks appear and the main peak of microlensing light curve is flattened.(ii) In microlensing events with the lens impact parameters larger than thedisc inner radius, the disc can break the symmetry of light curves with respectto the time of closest approach. (iii) In caustic-crossing binary microlensing,the discs produce wide peaks right before entering and immediately afterexiting from the caustic curves. (iv) The disc-induced perturbations are largerin the W149 filter than in the Z087 filter, unless the lens crosses the disccondensation radius. By performing a Monte Carlo simulation, the probabilitiesof detecting the disc perturbations by \wfirst~are estimated ~3 and 20 per centin single and binary microlensing, respectively. We anticipate that RST detectsaround 109 disc-induced perturbations during its microlensing survey if 5 percent of its source stars have discs.

Detecting the inner regions of discs around sources of microlensing with Roman Space Telescope