On Monday, September 19 at 14.00 we will be welcoming Jakub Klencki (ESO Garching and Max Planck Institute for Astrophysics Garching) for the gravitation group seminar. The seminar will take place online, (the zoom link can be found below). 

Title: From massive stars through X-ray binaries to gravitational-wave sources

Abstract: 
The last few years have seen an unprecedented growth in all the aspects of gravitational-wave (GW) astrophysics. At the frontier is population modeling of GW sources and their potential progenitors: massive stars in binary systems. Various models suggest that bulk of the population of binary black hole mergers have formed in metal-poor environments. This is primarily because low-metallicity stars experience reduced mass loss through winds, allowing them to form more massive black holes. The pressing question is now: how well do we really understand the ''basics'' of stellar evolution and the ''classical'' formation scenarios in the regime of low metallicity? In my talk, I will argue against the formation of massive binary black holes through the common-envelope evolution, one of the most prominent channels discussed in the literature. Furthermore, I will show that the textbook picture of mass transfer evolution, where a giant star is stripped of its envelope by an accreting companion, may no longer hold in the case of massive stars at low metallicity. I will discuss implications of our findings for various classes of objects (supernova progenitors, X-ray binaries, LIGO/Virgo sources) and highlight the crucial role of observational constraints from nearby metal-poor dwarf galaxies in the future.  


The schedule for upcoming gravitation group seminars can be found here:
https://gitlab.in2p3.fr/marsat/apc-gravitation-seminars/-/wikis/APC-Gravitation-group-seminars

Topic: Gravitation Group Seminar
Time: Sep 19, 2022 02:00 PM Paris

Join Zoom Meeting
https://u-paris.zoom.us/j/82739225617?pwd=eG9SbURiMEdhWW5icDQwRTBrZkk2QT09