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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:9
UID:UW-Physics-Event-9822
DTSTART:20261210T213000Z
DTEND:20261210T223000Z
DTSTAMP:20261015T133719Z
LAST-MODIFIED:20260914T160630Z
LOCATION:4421 Sterling Hall
SUMMARY:The Early Evolution of Exoplanetary Systems\, Astronomy Colloq
 uium\, Adina Feinstein\, Michigan State University
DESCRIPTION:Within the past decade\, we have discovered only a dozen y
 oung (< 300 Myr) short-period exoplanets\, compared to the ~6\,000 mat
 ure systems. The radii of these young planets are larger than older pl
 anets on similar orbital periods. The leading hypothesis is that these
  young planets have inflated atmospheres because they are still contra
 cting. Inflated atmospheres are more susceptible to photoevaporation â
 €” atmospheric removal driven by X-ray and ultraviolet (XUV) stellar i
 rradiation. These effects are intensified in the earliest stages of pl
 anetary evolution\, when young stars are more active and produce extre
 me XUV radiation on a variety of timescales. Even though it is challen
 ging to study exoplanets around active stars\, observational constrain
 ts of these targets provide crucial insights into our understanding of
  exoplanet formation and evolution. In this talk\, I will present earl
 y results of the characterization of eight young short-period exoplane
 ts and observed with JWST. I will present trends we have uncovered in 
 atmospheric composition as a function of age and highlight our search 
 for ongoing atmospheric escape. Beyond the planets\, I will present wh
 at we have been able to learn about the young host stars with these ne
 w high-precision observations. Understanding these properties is essen
 tial not only for correcting transmission spectra but for defining the
  environments that shape the fate of the exoplanet population we see t
 oday. 
URL:https://www.physics.wisc.edu/events/?id=9822
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