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By comparing photon diffusion time with gas outflow time, I argue that alarge fraction of the energy carried by the jets during the grazing envelopeevolution (GEE) might end in radiation, hence leading to an intermediateluminosity optical transient (ILOT). In the GEE a companion orbiting near theoutskirts of the larger primary star accretes mass through an accretion disk,and launches jets that efficiently remove the envelope gas from the vicinity ofthe secondary star. In cases of high mass accretion rates onto the stellarcompanion the energy carried by the jets surpass the recombination energy fromthe ejected mass, and when the primary star is a giant this energy surpassesalso the gravitational binding energy of the binary system. Some future ILOTsof giant stars might be better explained by the GEE than by merger and commonenvelope evolution without jets.

Intermediate luminosity optical transients during the grazing envelope evolution (GEE)