Free Fall of a Jupiter-like Planet onto a Protoplanetary Disk

The theory of the formation of planetary systems predicts ejection of bodies of different masses, including planets, from the system into interstellar space. In addition, isolated objects weighing up to 6 Jupiter masses can form in star formation regions due to gravitational collapse, like stars. According to modern estimates, in our Galaxy, the number of free-floating planets with a mass of several Jupiter masses should exceed the number of Main Sequence stars by at least two times. This means that the close approach of a star and a free-floating planet should be considered as not an exceptionally rare event. Free-floating planets can be captured by the gravitational field of another star and become its satellite, or fly by, changing the trajectory. If a star has a protoplanetary disk, a free-floating planet may collide with it. In this paper, the problem of the passage of a giant planet through the protoplanetary disk of a young star is considered. A gas dynamic simulation has been performed for a wide range of parameters of the orbit of the incoming planet. The possibility of observing such an event is analyzed on the light curves of stars whose disks are observed at a small angle to the line of sight (UX Ori type stars).