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More luminous than classical novae, but less luminous than Supernovae, liesthe exotic stellar eruptions known as Intermediate luminosity opticaltransients (ILOTs). They are divided into a number of sub-groups depending onthe erupting progenitor and the properties of the eruption. A large part of theILOTs is positioned on the slanted Optical Transient Stripe (OTS) in theEnergy-Time Diagram (ETD) that shows their total energy vs. duration of theireruption. We describe the different kinds of ILOTs that populate the OTS andother parts of the ETD. The high energy part of the OTS hosts the supernovaimpostors -- giant eruption (GE) of very massive stars. We show results of 3Dhydrodynamical simulations of GEs that expose the mechanism behind these GEs,and present new models for recent ILOTs. We discuss the connection betweendifferent kinds of ILOTs, and suggest that they have a common energy source --gravitational energy released by mass transfer. We emphasize similaritiesbetween Planetary Nebulae (PN) and ILOTs, and suggest that some PNe were formedin an ILOT event. Therefore, simulations used for GEs can be adapted for PNe,and used for learning about the influence of the ILOT events on the the centralstar of the planetary nebula.

Simulations and Modeling of Intermediate Luminosity Optical Transients and Supernova Impostors