Hydrodynamic response of a trapped superfluid to a periodic perturbation Shuwei Jin, Sébastien Laurent and Frédéric Chevy Eur. Phys. J. Special Topics, 227 15-16 (2019) 2263-2273 Published online: 24 January 2019 DOI: 10.1140/epjst/e2018-800024-0