Atiyah class of DG manifolds of positive amplitude

Behrend, Liao, and Xu showed that differential graded (DG) manifolds of positive amplitude forms a category of fibrant objects. In particular, this ensures that notion of derived intersection – more generally, homotopy fibre product – is well-defined up to weak equivalences. We prove that the Atiyah and Todd classes of DG manifolds of positive amplitude are invariant under the weak equivalences. As an application, we study Hochschild cohomology of DG manifolds of positive amplitude defined using poly-differential operators, which is compatible with Kontsevich formality theorem and Duflo–Kontsevich-type theorem established by Liao, Stiénon and Xu. We prove that this Hochschild cohomology is invariant under weak equivalences.