Speaker
Description
ALMA’s observations of circumstellar discs highlight the wide variety of properties and morphologies of their gas and dust. In particular, the widespread presence of rings and gaps in the dust component of discs is generally considered the direct signature of massive planets forming therein. These gaps and rings often appear at tens of au from the host star, raising the question of whether such distant planets can influence the formation of their inner counterparts. We took advantage of ALMA’s detailed characterization of the HD163296 system, a 5 Myr-old massive disk orbiting an A star and considered to host at least four distant giant planets and a massive planetesimal disk, to explore in detail the impact such planets have on the natal disk and the other planetary bodies forming therein. In this talk we will present how the formation of these gas giants excited the surrounding planetesimal disk and triggered the planetesimal-mediated large-scale transport of volatile elements (N, C, O), delivering them to the inner disk regions. We will examine how this delivery of volatile elements impacts the planets forming in such regions and how this process depends on the mass of the affected planets, from Earth-like to Jupiter-like planets. Finally, we will show how and when this process can create misleading atmospheric signatures overwriting those due to the formation history of the planets.
