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We follow the evolution of four observed exoplanets to the time when therespective parent star of each planet evolves off the main sequence and engulfsits planet to start a common envelope evolution (CEE), concluding that in eachcase this process powers an intermediate luminosity optical transient (ILOT;luminous red nova). We characterise the final thousands of days of the orbitaldecay towards a CEE and determine the properties of the star at the onset ofthe CEE. We scale the properties of the ILOT V1309 Scorpii to the properties ofa planet that enters a CEE inside a star on and near the Hertzsprung gap toestimate the duration and luminosity of the expected ILOT. Based on these weestimate that for a planet of Jupiter mass the ILOT will last for several daysand reach a luminosity of several thousand solar luminosity. This type of ILOTsare less luminous than classical novae. Because of the small amount of expecteddust and the small amount of energy that an accretion process onto the planetcan release, such ILOTs can teach us on the merger at the onset of CEE ofstellar companions. Our study adds to the variety of ILOTs that planets canpower as they interact with a more massive companion.

Faint intermediate luminosity optical transients (ILOTs) from engulfing exoplanets on the Hertzsprung gap