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The high star formation rates of luminous infrared galaxies (LIRGs) make themideal places for core-collapse supernova (CCSN) searches. At radio frequencies,free from dust extinction, it is possible to detect compact components withinthe innermost LIRG nuclear regions, such as SNe and SN remnants, as well as AGNburied deep in the LIRG nuclei. We studied the LIRG IC883 aiming at: (i)investigating its (circum-)nuclear regions using the e-EVN at 5GHz, ande-MERLIN at 6.9GHz, complemented by archival VLBI data; (ii) detecting at radiofrequencies the two recently reported circumnuclear SNe 2010cu and 2011hi,which were discovered by near-IR (NIR) adaptive optics observations of IC883;and (iii) further investigating the nature of SN2011hi at NIR by means ofobservations with Gemini-North. The circumnuclear regions traced by e-MERLIN at6.9GHz have an extension of ~1kpc, and show a striking double-sided structure,which very likely corresponds to a warped rotating ring, in agreement withprevious studies. Our e-EVN observations at 5GHz and complementary archivalVLBI data at 5GHz and 8.4GHz, reveal the presence of various milliarcseccompact components in the nucleus of IC883. A single compact source, an AGNcandidate, dominates the emission at both nuclear and circumnuclear scales, asimaged with the e-EVN and e-MERLIN, respectively. The other milliarcseccomponents are very suggestive of ongoing nuclear CCSN activity. Our e-EVNobservations also resulted in upper limits to the radio luminosity of the twoSNe in IC883 recently discovered at NIR. We refine the classification ofSN2011hi as a Type IIP SN according to our latest Gemini-North epoch from 2012,in agreement with a low-luminosity radio SN nature. We estimate a CCSN ratelower limit of 1.1_{-0.6}^{+1.3} yr^{-1} for the entire galaxy, based on threenuclear radio SNe and the circumnuclear SNe 2010cu and 2011hi. (abridged)

e-MERLIN and VLBI observations of the luminous infrared galaxy IC883: a nuclear starburst and an AGN candidate revealed