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SUMMARY:Evidence of planet engulfment in post-main sequence stars - Dr. Cl
 audia Aguilera Gomez\, ESO - Universidad Diego Portales (Chile)
DTSTART:20220610T121500Z
DTEND:20220610T124500Z
UID:TALK175670@talks.cam.ac.uk
CONTACT:Francisco Paz-C
DESCRIPTION:The post-main sequence stellar evolution can have catastrophic
  consequences for orbiting planets. With the expansion of the star's envel
 ope during the red giant branch\, some exoplanets are likely engulfed\, pr
 oducing changes in the surface chemical composition of the star. There are
  no clear chemical signatures that are unequivocally associated with this 
 event\, but enhancement of light elements that should be depleted on the s
 urface of red giants can be considered indicators of engulfment. In this t
 alk\, I will discuss lithium as a signature of accretion of substellar com
 panions in red giant branch stars. Although identifying individual engulfm
 ent events during the red giant evolutionary phase can be complicated\, th
 e death of a low-mass star provides new opportunities to study engulfment.
  Metals in the atmosphere of white dwarfs are signs of accretion of smalle
 r planetary bodies. Thus\, I will also show how these polluted white dwarf
 s offer a novel means to study the composition of rocky exoplanets and und
 erstand if they retain the same composition as the material from which the
 y formed.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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