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Planet formation in the pebble accretion scenario

Bertram Bitsch
MPIA, Heidelberg

Recent discoveries of exoplanetary systems have provided us with lots of information regarding single systems as well as with statistical overviews. Close in planets of a few Earth masses, so called super-Earths, seem to be the most common type of planet in the inner systems. However their formation pathway is still unknown. Observations of the birthplaces of planets, the protoplanetary discs, have revealed breathtaking sub-structures like rings and gaps in the mm-continuum. Among the many explanations for these sub-structures are that they are caused by growing planets.
In the core accretion scenario of planet formation, the core growth by the accretion of solids, where I will focus here in this talk on the accretion of mm-cm sized pebbles. When the planetary core becomes large enough, it starts to open a small gap in the gas disc which alters the movement of the mm-cm sized particles, which are then trapped exterior to the planet, causing gaps and rings in the observed protoplanetary discs.
In this talk, I will focus on the formation of super-Earths systems and their composition in the pebble accretion scenario and point to the questions we can answer with this model as well as to the open questions we have to attack in the next years. I will then discuss the formation of giant planets in the outer disc and how this can connect to the observations of sub-structures in protoplanetary discs with ALMA.

2019 October 29, 13:30

Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia