D$^0$ Meson R$_{AA}$ in PbPb Collisions at $\sqrt s_{NN}$ = 5.02~TeV and Elliptic Flow in pPb Collisions at $\sqrt s_{NN}$ = 8.16~TeV with CMS

The study of charm production in heavy-ion collisions is considered an excellent probe to study the properties of the hot and dense medium created in heavy-ion collisions. Measurements of D-meson nuclear modification can provide strong constraints into the mechanisms of in-medium energy loss and charm flow in the medium. The measurement of D$^0$ elliptic flow in pPb collision helps us understand the strength of the charm quark coupling to significantly reduced systems which demonstrate hydrodynamic properties. In this paper, the measurements of the D$^0$ nuclear modification factor in PbPb collisions at 5.02 TeV together with the a new measurement of D$^0$ elliptic flow in high multiplicity pPb collisions at 5.02 TeV using the two-particle correlation method will be presented.