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We report high angular resolution (~0.6''x0.5'' at 1.3mm) observations of theClass 0 intermediate-mass (IM) protostar NGC 7129--FIRS 2 using the PdBI. Ourobservations show the existence of a hot core at the position of the Class 0object. This is, up to our knowledge, the first IM hot core detected so far.Interferometric maps of the region in the the continuum at 3mm and 1.3mm and inthe CH3CN 5_k-->4_k, CH3OH 5_kk'-->4_kk', and D2CO 4_04-->3_03 lines arepresented in this paper. Enhanced CH3CN and CH3OH abundances are measuredtowards the hot core (X(CH3CN)~7.010^{-9}, X(CH3OH)~3 10^{-8}-- a few 10^{-7}).While intense D2CO emission is detected towards the hot core, the N2D+ line hasnot been detected in our interferometric observations. The different behaviorsof D2CO and N2D+ emissions suggest different formation mechanisms for the twospecies and different deuteration processes for H2CO and N2H+ (surface andgas-phase chemistry, respectively). Finally, the spectrum of the largebandwidth correlator show a forest of lines at the hot core position revealingthat this object is extraordinarily rich in complex molecules.Comment: 14 pages, 7 figures, accepted for publication in Astronomy &  Astrophysic

Detection of a hot core in the intermediate-mass Class 0 protostar NGC 7129–FIRS 2