Soker studies a variety of astrophysical objects, with a common thread being the conservation of angular momentum. For over 20 years Soker has been studying processes by which planets influence the late evolution of stars, such as the shaping of some planetary nebulae. He is known for his model of planetary nebulae formation as a result of binary star interaction that results in disc accretion and the ejection of jets that shape the nebula into a bipolar form.