Possibility of protostellar inheritance of organics to Jupiter-family comet 67P/C-G
Résumé
Complex organic molecules (COMs) play an essential role in the emergence of life. Understanding how, when and where COMs (including potentially prebiotic molecules) are formed is one of the most critical questions in the "Cradle of Life" science theme of astronomy. COMs have been detected in prestellar cores, protostars, and protoplanetary disks. Is it possible to preserve part of the molecular content during protostellar stage which can be incorporated into comets? By looking at the cometary compositions, observations of solar-type protostars can help to address this fundamental question. In this context, here we will present our observations towards the solar-type protostar IRAS 16293-2422 in the 3mm band of the IRAM 30m telescope along with current ALMA observations. We will describe how an integrative study using observations and chemo-dynamical simulations (using the state-of-the-art gas-grain-bulk (3 Phase) chemical-kinetic model) can help us to understand the chemical composition both on the surface as well as on the coma of comet 67P/C-G observed by the COSAC and ROSINA instruments onboard Rosetta spacecraft.