Carbon depletion in the early Solar system

ABSTRACT Earth and other rocky objects in the inner Solar system are depleted carbon compared to outer system, Sun, or ISM. It is believed that this a result of selective removal refractory from primordial circumstellar material. In work, we study irreversible release into gaseous environment via photolysis pyrolysis carbonaceous material during disc phase early system. We analytically solve one-dimensional advection equation derive an explicit expression describes depletion solids under influence radial vertical transport. find both mechanisms individually fail reproduce abundances typical conditions. While transport only marginally restricts photodecomposition, it inefficient limits these show explicitly increase mixing efficiency, and/or directly irradiated volume, favours depletion. Thermal decomposition requires hot (>500 K) beyond 3 au deplete formation region chondrites. FU Ori-type outbursts produce conditions such moderately compounds depleted. However, likely do not most innermost region. Hence, abundance at 1 typically does reach terrestrial levels. Nevertheless, specific conditions, combined abundances.