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Title: DOUBLE COMPACT OBJECTS. I. THE SIGNIFICANCE OF THE COMMON ENVELOPE ON MERGER RATES

Abstract

The last decade of observational and theoretical developments in stellar and binary evolution provides an opportunity to incorporate major improvements to the predictions from population synthesis models. We compute the Galactic merger rates for NS-NS, BH-NS, and BH-BH mergers with the StarTrack code. The most important revisions include updated wind mass-loss rates (allowing for stellar-mass black holes up to 80 M {sub Sun }), a realistic treatment of the common envelope phase (a process that can affect merger rates by 2-3 orders of magnitude), and a qualitatively new neutron star/black hole mass distribution (consistent with the observed {sup m}ass gap{sup )}. Our findings include the following. (1) The binding energy of the envelope plays a pivotal role in determining whether a binary merges within a Hubble time. (2) Our description of natal kicks from supernovae plays an important role, especially for the formation of BH-BH systems. (3) The masses of BH-BH systems can be substantially increased in the case of low metallicities or weak winds. (4) Certain combinations of parameters underpredict the Galactic NS-NS merger rate and can be ruled out. (5) Models incorporating delayed supernovae do not agree with the observed NS/BH 'mass gap', in accordance with our previousmore » work. This is the first in a series of three papers. The second paper will study the merger rates of double compact objects as a function of redshift, star formation rate, and metallicity. In the third paper, we will present the detection rates for gravitational-wave observatories, using up-to-date signal waveforms and sensitivity curves.« less

Authors:
; ;  [1];  [2];  [3];  [4];  [5];  [6]
  1. Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw (Poland)
  2. CCS-2, MSD409, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
  3. Enrico Fermi Institute, Department of Physics, and Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States)
  4. Department of Physics and Astronomy, University of Mississippi, University, MS 38677 (United States)
  5. School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT (United Kingdom)
  6. Center for Gravitation and Cosmology, University of Wisconsin-Milwaukee, Milwaukee, WI 53211 (United States)
Publication Date:
OSTI Identifier:
22086466
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; BINDING ENERGY; BLACK HOLES; GRAVITATIONAL WAVES; MASS; MASS DISTRIBUTION; NEUTRON STARS; RED SHIFT; SENSITIVITY; STAR EVOLUTION; STELLAR WINDS; SUPERNOVAE; WAVE FORMS

Citation Formats

Dominik, Michal, Belczynski, Krzysztof, Bulik, Tomasz, Fryer, Christopher, Holz, Daniel E., Berti, Emanuele, Mandel, Ilya, and O'Shaughnessy, Richard. DOUBLE COMPACT OBJECTS. I. THE SIGNIFICANCE OF THE COMMON ENVELOPE ON MERGER RATES. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/52.
Dominik, Michal, Belczynski, Krzysztof, Bulik, Tomasz, Fryer, Christopher, Holz, Daniel E., Berti, Emanuele, Mandel, Ilya, & O'Shaughnessy, Richard. DOUBLE COMPACT OBJECTS. I. THE SIGNIFICANCE OF THE COMMON ENVELOPE ON MERGER RATES. United States. doi:10.1088/0004-637X/759/1/52.
Dominik, Michal, Belczynski, Krzysztof, Bulik, Tomasz, Fryer, Christopher, Holz, Daniel E., Berti, Emanuele, Mandel, Ilya, and O'Shaughnessy, Richard. Thu . "DOUBLE COMPACT OBJECTS. I. THE SIGNIFICANCE OF THE COMMON ENVELOPE ON MERGER RATES". United States. doi:10.1088/0004-637X/759/1/52.
@article{osti_22086466,
title = {DOUBLE COMPACT OBJECTS. I. THE SIGNIFICANCE OF THE COMMON ENVELOPE ON MERGER RATES},
author = {Dominik, Michal and Belczynski, Krzysztof and Bulik, Tomasz and Fryer, Christopher and Holz, Daniel E. and Berti, Emanuele and Mandel, Ilya and O'Shaughnessy, Richard},
abstractNote = {The last decade of observational and theoretical developments in stellar and binary evolution provides an opportunity to incorporate major improvements to the predictions from population synthesis models. We compute the Galactic merger rates for NS-NS, BH-NS, and BH-BH mergers with the StarTrack code. The most important revisions include updated wind mass-loss rates (allowing for stellar-mass black holes up to 80 M {sub Sun }), a realistic treatment of the common envelope phase (a process that can affect merger rates by 2-3 orders of magnitude), and a qualitatively new neutron star/black hole mass distribution (consistent with the observed {sup m}ass gap{sup )}. Our findings include the following. (1) The binding energy of the envelope plays a pivotal role in determining whether a binary merges within a Hubble time. (2) Our description of natal kicks from supernovae plays an important role, especially for the formation of BH-BH systems. (3) The masses of BH-BH systems can be substantially increased in the case of low metallicities or weak winds. (4) Certain combinations of parameters underpredict the Galactic NS-NS merger rate and can be ruled out. (5) Models incorporating delayed supernovae do not agree with the observed NS/BH 'mass gap', in accordance with our previous work. This is the first in a series of three papers. The second paper will study the merger rates of double compact objects as a function of redshift, star formation rate, and metallicity. In the third paper, we will present the detection rates for gravitational-wave observatories, using up-to-date signal waveforms and sensitivity curves.},
doi = {10.1088/0004-637X/759/1/52},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}