Dr. Ralph Pudritz – McMaster University


Date: May 4, 2022
Location: ABB 102
Time: 2:30 PM

Dr. Ralph Pudritz – McMaster University
Professor, Department of Physics and Astronomy
Director, Origins institute

Title: Connecting exoplanetary populations with planet formation

Connecting the observed properties of exoplanet populations such as their masses, compositions, and orbital properties to how planets form is one of the great questions in exoplanetary science. Large numbers of protoplanetary disks have now been surveyed. The results indicate that substructure is common but that only a minority of systems have large disks with prominent ring/gap structures, thought to be created by forming planets. How planets accrete and migrate depends sensitively on properties of their underlying disks - such as the level of disk turbulence and winds. In this talk I will give an overview of recent advances on these topics. I will then summarize several of our own recent contributions arguing that large disks with gapped structure arise in disks with particularly weak turbulence in which forming planets are pushed out to large distances before returning towards the disk inner regions. Furthermore our populations synthesis studies indicate that the best match to observed planetary populations and their compositions arises for systems in which both turbulence and disks winds are active with a wide distribution of turbulence levels.
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