Cover Image

Binary black hole mergers from merged stars in the Galactic field

Show other versions (1)

The majority of massive stars are found in close binaries which: (i) are prone to merge and (ii) are accompanied by another distant tertiary star (triples). Here, we study the evolution of the stellar postmerger binaries composed of the merger product and the tertiary companion. We find that postmer...

Full description

Saved in:
Bibliographic Details
Main Authors: Stegmann, Jakob (Author) , Antonini, Fabio (Author) , Schneider, Fabian (Author) , Tiwari, Vaibhav (Author) , Chattopadhyay, Debatri (Author)
Format: Article (Journal)
Language:English
Published: 12 July 2022
In: Physical review
Year: 2022, Volume: 106, Issue: 2, Pages: 1-12
ISSN:2470-0029
DOI:10.1103/PhysRevD.106.023014
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.106.023014
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.106.023014
Get full text
Author Notes:Jakob Stegmann, Fabio Antonini, Fabian R.N. Schneider, Vaibhav Tiwari, and Debatri Chattopadhyay
Description
Summary:The majority of massive stars are found in close binaries which: (i) are prone to merge and (ii) are accompanied by another distant tertiary star (triples). Here, we study the evolution of the stellar postmerger binaries composed of the merger product and the tertiary companion. We find that postmerger binaries originating from compact stellar triples with outer semimajor axes aout,init≲101-102 AU provide a new way to form binary black hole mergers in the galactic field. By means of a population synthesis, we estimate their contribution to the total black hole merger rate to be R(z=0)=0.3-25.2 Gpc−3 yr−1. Merging binary black holes that form from stellar postmerger binaries have exceptionally low mass ratios. We identify a critical mass ratio q≃0.5 below which they dominate the total black hole merger rate in the field. We show that after including their additional contribution, the mass ratio distribution of binary black hole mergers in the galactic field scenario is in better agreement with that inferred from gravitational wave detections.
Item Description:Gesehen am 28.08.2022
Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/PhysRevD.106.023014

Similar Items