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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-6383
DTSTART:20210318T140000Z
DTEND:20210318T160000Z
DTSTAMP:20260415T010918Z
LAST-MODIFIED:20210304T143523Z
LOCATION:SPECIAL TIME 9:00 AM . Zoom link below in Abstract
SUMMARY:Planet Formation and the Composition of Rocky Planets\, Astron
 omy Colloquium\, Amy Bonsor\, University of Cambridge UK
DESCRIPTION:The composition of a rocky planet tells us about the struc
 ture of the planet\, its geology\, what it might be like on the surfac
 e and ultimately whether or not it hosts life. Identifying the key pro
 cesses during planet formation that control composition is crucial to 
 understanding exoplanets\, particularly as we start to detect many mor
 e rocky planets in the coming decades. White dwarfs that have accreted
  planetary material provide a unique window onto the composition of ex
 oplanetary 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 atmosphe
 res to learn about planet formation. I will discuss observational evid
 ence for a match between the compositions of planet-host stars and pla
 nets (Bonsor et al\, 2021). I will explore how these observations of p
 lanetary material in the atmospheres of white dwarfs can tell us about
  how planetary bodies lose volatiles and form iron cores\, exploring t
 he geology of exoplanetary systems (Harrison et al\, 2021b). I will pr
 esent observational evidence (based on Mn/Na) that rocky planetary bod
 ies in exoplanetary systems lost volatiles both during the initial pha
 se of grain growth\, whilst embedded in the nebula gas and later in th
 e system's evolution\, post-nebula\, due to heating from impacts (Harr
 ison et al\, 2021a).<br>
\nWeb Link:<br>
\n<br>
\nhttps://us02web.zoom
 .us/j/81316886240?pwd=RzlUdk5SRU5Xc1EyL0daTUFYUHBWUT09<br>
\n
URL:https://www.physics.wisc.edu/events/?id=6383
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