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SUMMARY:The Impact of Inspiral Timing and Model Assumptions on Convective 
 Common Envelopes
DTSTART;VALUE=DATE-TIME:20261028T181900Z
DTEND;VALUE=DATE-TIME:20261028T182000Z
DTSTAMP;VALUE=DATE-TIME:20261025T124244Z
UID:indico-contribution-3697@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Chaudhuri Aishani (University of Toronto)\nCommon en
 velope (CE) evolution occurs when one\, often more massive\, star in a bin
 ary system completely engulfs a nearby companion. The companion continues 
 its inspiral inside the shared envelope\, leading to one of two outcomes: 
 the companion merges with the primary star\, or its liberated orbital ener
 gy unbinds and ejects the envelope. In the latter case\, the ejection of t
 he envelope leaves behind a tight binary\; this process is thought to be t
 he primary formation mechanism for both thermonuclear supernova and gravit
 ational wave progenitor systems. However\, population synthesis codes ofte
 n fail at reproducing the observed population of these systems\, highlight
 ing gaps in our physical understanding of the CE phase.  In this work\, we
  study the physics of CE evolution by using a convective CE model\, which 
 accounts for the redistribution of energy by convection within the primary
 \, where inspiral energy liberated in a convection-dominated zone is lost 
 via convection and radiation. We extend previous research by investigating
  how the specific convection models assumptions adopted in the stellar evo
 lution code MESA impact the predictions for the outcome of CE evolution al
 ong the asymptotic giant branch (AGB). We find that differences in stellar
  structure caused by variations in the adopted convective parameters can l
 ead to drastic differences in the predicted CE efficiency (and therefore f
 inal binary separation)\, particularly for binaries with large initial sep
 arations which enter the CE towards the end of the primary’s AGB phase.\
 n\nhttps://nyx.physics.mcgill.ca/event/587/contributions/3697/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3697/
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