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SUMMARY:Towards realistic modelling of multiple-star systems - Adrian Hame
 rs - MPA\, Garching
DTSTART:20201019T130000Z
DTEND:20201019T140000Z
UID:TALK151504@talks.cam.ac.uk
CONTACT:Cleo Loi
DESCRIPTION:Observations have shown in recent years that multiple-star sys
 tems such as hierarchical triple- and quadruple-star systems are common\, 
 especially among massive stars. Such systems are potential sources of inte
 resting astrophysical phenomena including compact object mergers leading t
 o supernovae\, and gravitational wave events such as those recently detect
 ed by LIGO/VIRGO. However\, many uncertainties remain in their often compl
 ex evolution. In this talk\, I will discuss recent developments in multipl
 e-star evolution modelling in my newly-formed research group at the Max Pl
 anck Institute for Astrophysics. I will present the new Multiple Stellar E
 volution (MSE) code\, a population synthesis code designed to rapidly mode
 l the stellar\, binary\, and dynamical evolution of multiple-star systems.
  New features of MSE in comparison to previous population synthesis codes 
 include: 1) allowing for any number of stars\, as long as the initial syst
 em is hierarchical\, 2) dynamic switching between secular and direct N-bod
 y integration for fast yet accurate evolution of the gravitational dynamic
 s\, 3) treatment of mass transfer in eccentric orbits\, which occurs commo
 nly in multiple-star systems\, 4) a simplified treatment of tidal\, common
 -envelope\, and mass transfer evolution in which the companion is a binary
  instead of a single star\, and 5) support for including planets within th
 e stellar system. I will also briefly discuss ongoing efforts in my group 
 to improve upon existing prescriptions for tidal dissipation in stars\, an
 d talk about another code in development\, namely a multiple-star module f
 or the popular MESA stellar evolution code. The latter is detailed but com
 putationally demanding\, and it will complement the less accurate but fast
  MSE code. 
LOCATION:Online
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