Evolutionary Origins of Binary Neutron Star Mergers: Effects of Common Envelope Efficiency and Metallicity
The formation histories of compact binary mergers, especially stellar-mass binary black hole mergers, have recently come under increased scrutiny and revision. We revisit the question of the dominant formation channel and efficiency of forming binary neutron star (BNS) mergers. We use the stellar an...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ace434 |
| _version_ | 1827806188166709248 |
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| author | Monica Gallegos-Garcia Christopher P. L. Berry Vicky Kalogera |
| author_facet | Monica Gallegos-Garcia Christopher P. L. Berry Vicky Kalogera |
| author_sort | Monica Gallegos-Garcia |
| collection | DOAJ |
| description | The formation histories of compact binary mergers, especially stellar-mass binary black hole mergers, have recently come under increased scrutiny and revision. We revisit the question of the dominant formation channel and efficiency of forming binary neutron star (BNS) mergers. We use the stellar and binary evolution code MESA and implement a detailed method for common envelope and mass transfer. We perform simulations for donor masses between 7 M _⊙ and 20 M _⊙ with a neutron star (NS) companion of 1.4 M _⊙ and 2.0 M _⊙ at two metallicities, using varying common envelope efficiencies and two different prescriptions to determine if the donor undergoes core collapse or electron capture, given their helium and carbon–oxygen cores. In contrast to the case of binary black hole mergers, for an NS companion of 1.4 M _⊙ , all BNS mergers are formed following a common envelope phase. For an NS mass of 2.0 M _⊙ , we identify a small subset of mergers following only stable mass transfer if the NS receives a natal kick sampled from a Maxwellian distribution with velocity dispersion σ = 265 km s ^−1 . Regardless of the supernova prescription, we find more BNS mergers at subsolar metallicity compared to solar. |
| first_indexed | 2024-03-11T21:37:36Z |
| format | Article |
| id | doaj.art-405d838cc1e24df8a5682f3b73584aee |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T21:37:36Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-405d838cc1e24df8a5682f3b73584aee2023-09-26T17:14:28ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01955213310.3847/1538-4357/ace434Evolutionary Origins of Binary Neutron Star Mergers: Effects of Common Envelope Efficiency and MetallicityMonica Gallegos-Garcia0https://orcid.org/0000-0003-0648-2402Christopher P. L. Berry1https://orcid.org/0000-0003-3870-7215Vicky Kalogera2https://orcid.org/0000-0001-9236-5469Department of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA ; mgallegosgarcia@u.northwestern.edu; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) , 1800 Sherman, Evanston, IL 60201, USADepartment of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA ; mgallegosgarcia@u.northwestern.edu; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) , 1800 Sherman, Evanston, IL 60201, USA; SUPA, School of Physics and Astronomy, University of Glasgow , Glasgow, G12 8QQ, UKDepartment of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA ; mgallegosgarcia@u.northwestern.edu; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) , 1800 Sherman, Evanston, IL 60201, USAThe formation histories of compact binary mergers, especially stellar-mass binary black hole mergers, have recently come under increased scrutiny and revision. We revisit the question of the dominant formation channel and efficiency of forming binary neutron star (BNS) mergers. We use the stellar and binary evolution code MESA and implement a detailed method for common envelope and mass transfer. We perform simulations for donor masses between 7 M _⊙ and 20 M _⊙ with a neutron star (NS) companion of 1.4 M _⊙ and 2.0 M _⊙ at two metallicities, using varying common envelope efficiencies and two different prescriptions to determine if the donor undergoes core collapse or electron capture, given their helium and carbon–oxygen cores. In contrast to the case of binary black hole mergers, for an NS companion of 1.4 M _⊙ , all BNS mergers are formed following a common envelope phase. For an NS mass of 2.0 M _⊙ , we identify a small subset of mergers following only stable mass transfer if the NS receives a natal kick sampled from a Maxwellian distribution with velocity dispersion σ = 265 km s ^−1 . Regardless of the supernova prescription, we find more BNS mergers at subsolar metallicity compared to solar.https://doi.org/10.3847/1538-4357/ace434Gravitational wave sourcesNeutron starsCommon envelope evolutionStellar evolutionary modelsRoche lobe overflow |
| spellingShingle | Monica Gallegos-Garcia Christopher P. L. Berry Vicky Kalogera Evolutionary Origins of Binary Neutron Star Mergers: Effects of Common Envelope Efficiency and Metallicity The Astrophysical Journal Gravitational wave sources Neutron stars Common envelope evolution Stellar evolutionary models Roche lobe overflow |
| title | Evolutionary Origins of Binary Neutron Star Mergers: Effects of Common Envelope Efficiency and Metallicity |
| title_full | Evolutionary Origins of Binary Neutron Star Mergers: Effects of Common Envelope Efficiency and Metallicity |
| title_fullStr | Evolutionary Origins of Binary Neutron Star Mergers: Effects of Common Envelope Efficiency and Metallicity |
| title_full_unstemmed | Evolutionary Origins of Binary Neutron Star Mergers: Effects of Common Envelope Efficiency and Metallicity |
| title_short | Evolutionary Origins of Binary Neutron Star Mergers: Effects of Common Envelope Efficiency and Metallicity |
| title_sort | evolutionary origins of binary neutron star mergers effects of common envelope efficiency and metallicity |
| topic | Gravitational wave sources Neutron stars Common envelope evolution Stellar evolutionary models Roche lobe overflow |
| url | https://doi.org/10.3847/1538-4357/ace434 |
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