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SUMMARY:Planetary Evolution Across Stellar Lifetimes - Sydney Jenkins\, MI
 T
DTSTART:20250923T120000Z
DTEND:20250923T130000Z
UID:TALK235324@talks.cam.ac.uk
CONTACT:Max Sommer
DESCRIPTION:Over the past thirty years\, nearly 6\,000 planets have been c
 onfirmed. These systems provide key insights into how planet populations e
 volve over time\, sculpted by planetary dynamics and stellar processes. Su
 ch mechanisms can drive dramatic changes on the planet and\, in extreme ca
 ses\, lead to its destruction. However\, there are many gaps in our unders
 tanding of the evolution of planetary systems. In particular\, the ultimat
 e fate of these systems as their host stars evolve off the main sequence r
 emains largely unknown. In this talk\, I will present my work probing the 
 mechanisms that shape planets over their lifetime. First\, I will examine 
 the impact of migration and photoevaporation on main-sequence systems. The
  recently confirmed planet\, TOI-5800 b\, provides a unique case study of 
 an eccentric sub-Neptune on a close-in orbit\, and may provide insight int
 o how evolutionary processes contribute to population-level features such 
 as the Neptunian desert. Second\, I will describe how stellar evolution tr
 ansforms planetary systems. In addition to destroying inner planets and dr
 amatically altering the dynamics of outer planets\, this process may also 
 fundamentally alter the atmospheric composition of giant planets through a
  phase called common envelope evolution. Finally\, I will discuss the ulti
 mate fate of planet populations as their host stars evolve to their final 
 state as white dwarfs. Even in these mature systems\, planets can be destr
 oyed through scattering into their host’s Roche radius\, leaving an obse
 rvational signature called “pollution.” I will also highlight ongoing 
 efforts to probe the surviving planet population around white dwarf stars 
 with JWST.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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