Coffee talks
Friday 23/10/2026 @ 11:30, OAS Seminar Room Second floor (CNR area) + Remote meet.google.com/sue-bwvk-axf
Maria de Juan Ovelar (University of Warwick (UK)), "Setting up the stage for Sandwiched Planet Formation: Segregation of planet-forming environments by multiple planets in discs"
Sandwiched Planet Formation is a theory that aims to explain how some planetary systems come to host a low-mass planet “sandwiched” between two more massive ones. With the outer planet acting as a gatekeeper, the supply of solids to the region between the planets is hindered capping the mass budget. Moreover, it does so sorting dust by size and dividing the disc into physically and chemically distinct regions constituting different planet-forming environments. In this work we combine multifluid hydrodynamical and radiative transfer simulations to explore these different environments through multi-wavelnegth synthetic observations showing that the outer ring becomes a massive, almost purely large-grained trap of likely ice-rich pebbles holding ~5–13× more solids than the sandwiched ring, at dust-to-gas ratios approaching or exceeding unity, which are prime conditions for streaming instability and planetesimal formation. The sandwiched region is instead less massive and more polydisperse reservoir of solids, setting up a different stage for grain processing, chemistry and pebble accretion.