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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-9447
DTSTART:20251009T203000Z
DTEND:20251009T213000Z
DTSTAMP:20260413T102615Z
LAST-MODIFIED:20251006T122110Z
LOCATION:4421 Sterling Hall
SUMMARY:Old New Worlds: Planetary Destruction and Renewal over Stellar
  Lifetimes\, Astronomy Colloquium\, Dr. Chris O'Connor\, Northwestern 
 University
DESCRIPTION:Planetary systems are ubiquitous\, but not eternal. In thi
 s two-part talk\, I will describe recent work on long-term stellar evo
 lutionary and dynamical processes that shape\, transform\, and destroy
  planets and planetary systems. In part one\, I will introduce the ext
 raordinary exoplanet WD1856b and summarize recent theoretical and obse
 rvational progress\, and enduring challenges\, in understanding its fo
 rmation and evolution. In part two\, I will discuss the timely "breaki
 ng the chains" problem in exoplanet dynamics\, which seeks an explanat
 ion for the declining prevalence of mean-motion resonances (MMRs) with
  age in compact planetary systems. I will describe a possible scenario
  for breaking the chains through planetesimal interactions and its imp
 lications about exoplanet architectures beyond the "ice line."
URL:https://www.physics.wisc.edu/events/?id=9447
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