Constraining accretion efficiency in massive binary stars with LIGO Virgo black holes
Abstract
The growing sample of LIGOVirgo black holes (BHs) opens new perspectives for the study of massive binary evolution. Here, we study the impact of mass accretion efficiency and common envelope on the properties of binary BH (BBH) mergers, by means of population synthesis simulations. We model mass accretion efficiency with the parameter f_{MT} ∈ [0.05, 1], which represents the fraction of mass lost from the donor which is effectively accreted by the companion. Lower values of f_{MT} result in lower BBH merger rate densities and produce mass spectra skewed towards lower BH masses. Our hierarchical Bayesian analysis, applied to BBH mergers in the first and second gravitationalwave transient catalogue, yields zero support for values of f_{MT} ≲ 0.6, with a lower boundary of the 99 per cent credible intervals equal to f_{MT} = 0.59. This result holds for all the values of the commonenvelope efficiency parameter we considered in this study α_{CE} ∈ [1, 10]. This confirms that gravitationalwave data can be used to put constraints on several uncertain binary evolution processes.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 August 2021
 DOI:
 10.1093/mnras/stab1589
 arXiv:
 arXiv:2010.11220
 Bibcode:
 2021MNRAS.505.3873B
 Keywords:

 black hole physics;
 gravitational waves;
 methods: numerical;
 methods: statistical;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 9 pages, 5 figures, published in MNRAS