  The discovery of optical jets immersed in the strong UV radiation field of
the Rosette Nebula sheds new light on, but meanwhile poses challenges to, the
study of externally irradiated jets. The jet systems in the Rosette are found
to have a high state of ionization and show unique features. In this paper, we
investigate the evolutionary status of the jet driving sources for young
solar-like stars. To our surprise, these jet sources indicate unexpected near
infrared properties with no excess emission. They are bathed in harsh external
UV radiation such that evaporation leads to a fast dissipation of their
circumstellar material. This could represent a transient phase of evolution of
young solar-like stars between classical and weak lined T Tauri stars. Naked T
Tauri stars formed in this way have indistinguishable evolutionary ages from
those of classical T Tauri stars resulting from the same episode of star
formation. However, it would be hard for such sources to be identified if they
are not driving an irradiated jet in a photoionized medium.
