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Aims. Our aim is to study deuterium burning in objects forming according tothe core accretion scenario in the hot and cold start assumption and whatminimum deuterium burning mass limit is found for these objects. We also studyhow the burning process influences the structure and luminosity of the objects.Furthermore we want to test and verify our results by comparing them to alreadyexisting hot start simulations which did not consider, however, the formationprocess.  Methods. We present a new method to calculate deuterium burning of objects ina self-consistently coupled model of planet formation and evolution. We discusswhich theory is used to describe the process of deuterium burning and how itwas implemented.  Results. We find that the objects forming according to a hot start scenariobehave approximately in the same way as found in previous works of evolutionarycalculations, which did not consider the formation. However, for cold startobjects one finds that the objects expand during deuterium burning instead ofbeing partially stabilized against contraction. In both cases, hot and coldstart, the mass of the solid core has an influence on the minimum mass limit ofdeuterium burning. The general position of the mass limit, 13 MJ, stays howeverapproximately the same. None of the investigated parameters was able to changethis mass limit by more than 0.8 MJ. Due to deuterium burning, the luminosityof hot and cold start objects becomes comparable after ~ 200 Myrs.

Deuterium burning in objects forming via the core accretion scenario - Brown dwarfs or planets?