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Chemically Homogeneous Evolution: A rapid population synthesis approach

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arxiv 2010.00002 v2 pith:M5WI6O74 submitted 2020-09-29 astro-ph.SR astro-ph.HE

Jeff Riley , Ilya Mandel , Pablo Marchant , Ellen Butler , Kaila Nathaniel , Coenraad Neijssel , Spencer Shortt , Alejandro Vigna-Gomez This is my paper · ORCID
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keywords binaryevolutionpopulationgravitational-wavemergersapproachbbhschannel
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We explore chemically homogeneous evolution (CHE) as a formation channel for massive merging binary black holes (BBHs). We develop methods to include CHE in a rapid binary population synthesis code, Compact Object Mergers: Population Astrophysics and Statistics (COMPAS), which combines realistic models of binary evolution with cosmological models of the star-formation history of the Universe. For the first time, we simultaneously explore conventional isolated binary star evolution under the same set of assumptions. This approach allows us to constrain population properties and make simultaneous predictions about the gravitational-wave detection rates of BBH mergers for the CHE and conventional formation channels. The overall mass distribution of detectable BBHs is consistent with existing gravitational-wave observations. We find that the CHE channel may yield up to ~70% of all gravitational-wave detections of BBH mergers coming from isolated binary evolution.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Evidence for Three Subpopulations of Merging Binary Black Holes at Different Primary Masses

    astro-ph.HE 2025-09 conditional novelty 6.0 of 10

    GWTC-4 data supports three subpopulations of merging black holes with transition masses at about 28 and 40 solar masses, differing in mass ratio and spin.

  2. A Possible Triple Formation Scenario of Binary Black Hole Merge With One In Pair-instability Supernova Mass Gap

    astro-ph.HE 2026-07 conditional novelty 5.0 of 10

    An isolated hierarchical triple channel with chemically homogeneous evolution and triple common envelope can produce PISN mass-gap BBH mergers matching GW190706 at ~22% of the observed rate.

  3. Inferring the pair-instability mass gap from gravitational wave data

    astro-ph.HE 2025-06 conditional novelty 5.0 of 10

    Non-parametric analysis of GWTC-3 finds a transition at roughly 46 solar masses above which the effective spin distribution broadens and becomes consistent with symmetry around zero, consistent with second-generation ...

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