Planet formation in the solar system and abroad

24/05/2022

Dear colleagues,

We are pleased to invite you to the next virtual seminar organized by the ExoplaNAts team Tuesday 31st, May, at 14:30 on google meets at the link: https://meet.google.com/bjp-etjy-ykm.

We will host Dr. Bertram Bitsch (Max Planck Institute for Astronomy,  Heidelberg, Germany), who will speak about 

 

Planet formation in the solar system and abroad

 

ABSTRACT:

Planet formation theories were inspired in the past by our own solar system, but the detection of exoplanets have further challenged our understanding of planet formation - especially the classes of planets we do not host in our own solar system like close-in super-Earths and hot Jupiters. A good planet formation theory thus has to explain the formation of the solar system as well as the formation of exoplanetary systems.

In the core accretion scenario, a planetary core of several earth masses forms first by accreting pebbles and/or planetesimals before it can start to accrete gas. In the pebble accretion scenario, this transition in the accretion regime is linked to the pebble isolation mass, the mass at which growing planets open partial gaps in their protoplanetary disc - a so-called pressure bump - and block the inward flux of pebbles, allowing the planetary atmosphere to cool, contract and grow. The blocking of pebbles does not only influence the growing planet, but also the disc interior to the planet, which is starved of material, resulting in reduced growth of inner planets. In this talk, I will first introduce the concepts relevant for planetary growth (e.g. pebble growth and drift, pebble accretion, planetesimal formation). I will then focus on how drifting pebbles (and their blocking) can help to explain constraints in the solar system (carbonaceous vs. non carbonaceous chondrites) and for exoplanets.

 

 

We look forward to seeing you there!

 

Cheers,

The Exo-plaNAts Group