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Events on Thursday, March 18th, 2021

Astronomy Colloquium
Planet Formation and the Composition of Rocky Planets
Time: 9:00 am - 11:00 am
Place: SPECIAL TIME 9:00 AM . Zoom link below in Abstract
Speaker: Amy Bonsor, University of Cambridge UK
Abstract: The composition of a rocky planet tells us about the structure of the planet, its geology, what it might be like on the surface and ultimately whether or not it hosts life. Identifying the key processes during planet formation that control composition is crucial to understanding exoplanets, particularly as we start to detect many more rocky planets in the coming decades. White dwarfs that have accreted planetary material provide a unique window onto the composition of exoplanetary bodies. My talk will focus on how we can use the ratios of key species such as Ca/Mg, Ca/Fe observed in the white dwarf atmospheres to learn about planet formation. I will discuss observational evidence for a match between the compositions of planet-host stars and planets (Bonsor et al, 2021). I will explore how these observations of planetary material in the atmospheres of white dwarfs can tell us about how planetary bodies lose volatiles and form iron cores, exploring the geology of exoplanetary systems (Harrison et al, 2021b). I will present observational evidence (based on Mn/Na) that rocky planetary bodies in exoplanetary systems lost volatiles both during the initial phase of grain growth, whilst embedded in the nebula gas and later in the system's evolution, post-nebula, due to heating from impacts (Harrison et al, 2021a).
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Cosmology Journal Club
Time: 12:00 pm - 1:00 pm
Abstract: Cosmology Journal Club is back! We will be having virtual meetings this semester.

Each week, we start with a couple scheduled 15 minute talks about one's research, or an arXiv paper. The last 30 minutes will typically be open to the group for anyone to discuss an arXiv paper.

All are welcome and all fields of cosmology are appropriate.

Contact Ross Cawthon, cawthon@wisc, for more information.

Zoom info
Meeting ID: 93592708053, passcode: cmbadger

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MS&E Spring Virtual Seminar
Exploiting soft X-ray ARPES to look beyond the surface in correlated electron systems
Time: 4:00 pm
Place: Zoom Meeting
Speaker: Dr. Jessica McChesney , Argonne National Laboratory
Abstract: Please see the attached flyer and biographical sketch for more detailed information on the talk. The seminar will be available via the below Zoom information:
Meeting ID: 986 4468 1493
Passcode: 409223
Presentation: Dr. Jessica McChesney, 3_18, MSE Spring Seminar '2, McChesney Biosketch 21.pdf
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