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IC883 is a luminous infrared galaxy (LIRG) classified as a starburst-activegalactic nucleus (AGN) composite. In a previous study we detected alow-luminosity AGN (LLAGN) radio candidate. Here we report on our radiofollow-up at three frequencies which provides direct and unequivocal evidenceof the AGN activity in IC883. Our analysis of archival X-ray data, togetherwith the detection of a transient radio source with luminosity typical ofbright supernovae, give further evidence of the ongoing star formationactivity, which dominates the energetics of the system. At sub-parsec scales,the radio nucleus has a core-jet morphology with the jet being a newly ejectedcomponent showing a subluminal proper motion of 0.6c-1c. The AGN contributesless than two per cent of the total IR luminosity of the system. Thecorresponding Eddington factor is ~1E-3, suggesting this is a low-accretionrate engine, as often found in LLAGNs. However, its high bolometric luminosity(~10E44erg/s) agrees better with a normal AGN. This apparent discrepancy mayjust be an indication of the transition nature of the nucleus from a systemdominated by star-formation, to an AGN-dominated system. The nucleus has astrongly inverted spectrum and a turnover at ~4.4GHz, thus qualifying as acandidate for the least luminous (L_5.0GHz ~ 6.3E28erg/s/Hz) and one of theyoungest (~3000yr) gigahertz-peaked spectrum (GPS) sources. If the GPS originfor the IC883 nucleus is confirmed, then advanced mergers in the LIRG categoryare potentially key environments to unveil the evolution of GPS sources intomore powerful radio galaxies.

Unveiling the AGN in IC 883: discovery of a parsec-scale radio jet