The correlation of X-ray binaries between X-ray and Optical light with MAXI and TESS

We searched for the correlation between X-ray and optical variabilities of X-ray binaries by comparing the light curves observed by MAXI and TESS at the same time. First, from MAXI public light curves of more than 400 X-ray sources, We chose 33 sources which show appreciable modulations in X-ray and are observed in TESS (at Nov 2019). Then I obtained light curves of these 33 sources from TESS Full-frame images using 'eleanor'. Among them, Cen X-3 and SMC X-1 have been observed by both satellites at the same time for 54 days and showed clear modulations in both X-ray and optical light. We performed the modeling of optical light curves for these X-ray binaries based on a simple geometric model. In our model, tidal and rotational distortion, limb-darkening and gravity darkening effects are taken into account. In addition, the effect of the presence of a disk is also included. I'll discuss light curves of SMC X-1 and Cen X-3 using this model and give constraints on their parameters