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Loosely bound light nuclei are produced in abundance in heavy-ion collisions.There are two main possible models to explain their production mechanism - thethermal model and the coalescence model. The thermal model suggests that thelight nuclei are produced from a thermal source, where they are in equilibriumwith other species present in the fireball. However, due to the small bindingenergies, the produced nuclei are not likely to survive the high-temperatureconditions of the fireball. The coalescence model tries to explain theproduction of light nuclei by assuming that they are formed at later stages bythe coalescence of protons and neutrons near the kinetic freeze-out surface.The final-state coalescence of nucleons will lead to the mass number scaling ofthe elliptic flow ($v_2$) of light nuclei. This scaling states that the $v_2$of light nuclei scaled by their respective mass numbers will follow veryclosely the $v_2$ of nucleons. Therefore, studying the $v_2$ of light nucleiand comparing it with the $v_2$ of protons will help us in understanding theirproduction mechanism.  In this talk, we will present the transverse momentum ($p_{T}$) andcentrality dependence of $v_2$ of $d$, $t$, and $^3\text{He}$ in Au+Aucollisions at $\sqrt{s_{NN}}$ = 14.6, 19.6, 27, and 54.4 GeV. Mass numberscaling of $v_2(p_T)$ of light (anti-)nuclei will be shown and physicsimplications will be discussed.

Elliptic flow of light nuclei in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.6, 19.6, 27, and 54.4 GeV using the STAR detector