  We calculate the lightcurves of jet-driven bipolar core collapse supernova
(CCSN) explosions into a bipolar circumstellar mater (CSM) and show that an
equatorial observer finds the lightcurves to possess a rapid, and even an
abrupt, drop. The scenario that might lead to such an explosion morphology is a
common envelope evolution (CEE) where shortly before the CCSN explosion the RSG
progenitor interacts with a more compact companion that spirals-in and spins-up
the core. The companion can be a main sequence star, a neutron star, or a black
hole. The binary interaction ejects a shell through an intensive wind and the
CEE ejects a denser gas in the equatorial plane. We assume that the companion
accretes mass and launches jets. We conduct three-dimensional (3D)
hydrodynamical simulations where we launch weak jets, the shaping jets, into
the dense shell and show that the interaction forms a bipolar CSM. As a result
of the rapid pre-collapse core rotation jets drive the CCSN explosion. We
simulate the interaction of the jets with the bipolar CSM and use a simple
scheme to calculate the lightcurves. We show that the abrupt drop in the
lightcurve of an observer not too close to the polar directions can account for
the lightcurve of the hydrogen poor luminous supernova (LSN) SN 2018don. Our
study strengthens the claim that jet-driven explosions account for many, even
most, CCSNe.
