Past Events

Speaker: CAROLINE DORN, ETH ZURICH Title: Hidden water in magma oceans Abstract: Over the past years, there has been huge progress in our understanding of the bulk properties of sub-Neptune exoplanets. Because hot and close-in planets are abundant in the exoplanet population, phase transitions in the interiors of small, dominantly rocky planets have come into sharper focus. Here, we use coupled structural models of the interior and atmosphere of up to super-Earth-sized exoplanets to explore the effect of water partitioning…

Speaker: MEGAN NEWCOMBE, UNIVERSITY OF MARYLANDTitle: Efficient Degassing of Planetesimals During Melting and Differentiation: Water Delivery to Earth via Unmelted MaterialAbstract:The origin of water in the terrestrial planets is a topic of debate. Inner solar system bodies (e.g., Angrites, 4-Vesta, and the Moon) have D/H and volatile element ratios consistent with delivery of water by chondritic material, but uncertainties persist regarding the timing of that delivery, the ability of planetesimals to retain volatiles during accretion and differentiation, and the role…

Speaker: Jacob Kegerreis, Institute for Computational Cosmology, Durham University Title: Atmospheric Erosion (and more!) by Giant Impacts onto Terrestrial Planets Abstract: Giant impacts dominate many planets' late accretion and evolution, including the Earth's, and can build, erode, or completely destroy a young atmosphere. In this talk, I'll present how we use 3D simulations to examine the erosion and other consequences of these collisions. For example, in the Moon-forming impact, only around 10% of the atmosphere would have been lost from…

Speaker: Karin Öberg, Department of Astronomy, Harvard University Title: The Chemistry of Planet Formation Abstract: Planets form in disks of dust and gas around young stars. The compositions of planets, including the hospitality to life, is fundamentally set by the composition of this dust and gas across the planet-forming disk. Recently we undertook a large ALMA project to map out the chemical content of five such disks at scales of 10s to 100s of au. We find a rich and…

Speaker: Fabrice Gaillard, CNRS, Orleans Title: Atmophile elements in magma oceans Abstract: The process ruling the fate light volatile elements (life-forming elements, C-H-O-S-N) during the magma ocean stage are important to define since numerous geochemical observations indicate that these were delivered early on planetry systems. Here, combining experimental data and thermodynamic modelling, I will expose two axis of our research on 1- the outgassing of the magma ocean atmosphere and 2- the sequestration of some of these elements in the…

Speaker: Christoph Burkhardt, Institut für Planetologie, Westfälische Wilhelms-Universität Münster Title: Mode of terrestrial planet formation and heritage of Earth's volatiles: the story from isotope anomalies in meteorites Abstract: As tracers of planetary genetics, isotope anomalies among planetary materials can provide key constraints for unraveling the Solar System’s dynamical evolution, from the collapse of the molecular cloud to the formation of the terrestrial planets. In this lecture I will show how isotope anomalies among meteorites can be used to constrain the origin…