Asteroid multiplicity detection in Gaia DR2

Binary asteroids are of special importance in planetary science as they provide direct measurements of the body's bulk mass and density. The main way to discover these systems is by detecting their mutual events in the lightcurves. There are almost 400 asteroids with satellites known as of writing this. Gaia Data Release 2 (Gaia DR2) contains sparse disk-integrated brightness measurements for more than 14.000 asteroids spanned over 22 months of observations. We have studied these data to detect multiple asteroid system candidates. For this work we have used the inversion genetic algorithm which provides best fit solutions for asteroids' spin and shape parameters. In order to cope with the limited viewing geometries of a large majority of asteroids, we have upgraded the inversion algorithm to combine Gaia DR2 with other ground-based data such as the Lowell Observatory photometric database. In the near future we envisage a great increase on the number of multiple asteroid discovery by analysing the data of large sky surveys. Particularly interesting will be the analysis of Gaia DR3 (expected for H2 2021) which will contain data for more than 100.000 asteroids.