Planetary Science Seminar winter-2020

There is a wealth of evidence for differential transport in planet forming discs, both from the Solar System and observations of protoplanetary discs. I will discuss two topics: (i) how snow-lines - regions where volatiles transition from the solid phase to the vapour phase - can be more dynamic that previously thought, having wide ranging implications. (ii) the Sun is depleted in refractories relative to nearby "Solar-twins". I will use the exoplanet data places strong constraints on its origin and suggest the early formation of Jupiter is the explanation. This explanation has support from observations of "Transition discs" around young A/F-type stars that show similar refractory depletion.