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Progenitors of gravitational wave mergers: Binary evolution with the stellar grid-based code ComBinE

Kruckow, Matthias U., Tauris, Thomas M., Langer, Norbert, Kramer, Michael and Izzard, Robert G. (2018) Progenitors of gravitational wave mergers: Binary evolution with the stellar grid-based code ComBinE Monthly Notices of the Royal Astronomical Society.

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The first gravitational wave detections of mergers between black holes and neutron stars represent a remarkable new regime of high-energy transient astrophysics. The signals observed with LIGO-Virgo detectors come from mergers of extreme physical objects which are the end products of stellar evolution in close binary systems. To better understand their origin and merger rates, we have performed binary population syntheses at different metallicities using the new grid-based binary population synthesis code ComBinE. Starting from newborn pairs of stars, we follow their evolution including mass loss, mass transfer and accretion, common envelopes and supernova explosions. We apply the binding energies of common envelopes based on dense grids of detailed stellar structure models, make use of improved investigations of the subsequent Case BB Roche-lobe overflow and scale supernova kicks according to the stripping of the exploding stars. We demonstrate that all the double black hole mergers, GW150914, LVT151012, GW151226, GW170104, GW170608 and GW170814, as well as the double neutron star merger GW170817, are accounted for in our models in the appropriate metallicity regime. Our binary interaction parameters are calibrated to match the accurately determined properties of Galactic double neutron star systems, and we discuss their masses and types of supernova origin. Using our default values for the input physics parameters, we find a double neutron star merger rate of about 3.0 Myr-1 for Milky-Way equivalent galaxies. Our upper limit to the merger-rate density of double neutron stars is R≃400 yr-1 Gpc-3 in the local Universe (z=0).

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Kruckow, Matthias U.
Tauris, Thomas M.
Langer, Norbert
Kramer, Michael
Izzard, Robert
Date : 2018
Funders : Science and Technology Facilities Council (STFC)
Copyright Disclaimer : This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords : Gavitational waves. Stars: evolution. Binaries: close. Stars: neutron. Stars: black holes. Gamma-ray burst: general.
Related URLs :
Depositing User : Clive Harris
Date Deposited : 13 Aug 2018 23:09
Last Modified : 11 Dec 2018 11:24

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