Rapid population synthesis of double neutron stars Alejandro - - PowerPoint PPT Presentation

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Rapid population synthesis of double neutron stars Alejandro - - PowerPoint PPT Presentation

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Rapid population synthesis of double neutron stars Alejandro Vigna-Gmez avignagomez@nbi.ku.dk Bonn 2020 14th Bonn workshop on the formation and evolution of neutron stars 1 Double Neutron Stars (DNSs): Observations Data as presented in

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Rapid population synthesis of double neutron stars

Alejandro Vigna-Gómez avignagomez@nbi.ku.dk

Bonn 2020 14th Bonn workshop on the formation and evolution of neutron stars

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Double Neutron Stars (DNSs): Observations

See Tauris+2017 and references therein.

2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00

mtot (M)

2 4 6 8 10

Probability density

χ < 0.89 χ < 0.05 Galactic BNS

* GW170817: Abbott+2017 (arXiv:1710.05832) ^GW190425 : Abbott+2019 (arXiv:2001.01761) Data as presented in Vigna-Gómez+2018 (arXiv:1805.07974)

^GW190425 *GW170817: mtot=2.74, 2.82 Msol

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Synthetic Population

Vigna-Gómez+2020 (arXiv:2001.09829) https://zenodo.org/record/3593844 Period-eccentricity (P-e) diagram Hertzsprung-Russell diagram

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  • Rapid population synthesis code
  • Isolated binary evolution
  • Sampling: MC/AIS
  • Integration over cosmic history
  • Interpolation using machine learning

https://compas.science/ compas-user@googlegroups.com 3

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Population Synthesis

p(M1,q,e,a)ZAMS p(M1,q,e,a)DNS Common Envelope Supernovae Mass Transfer Winds Vkick Mrem λ α facc γ fWR fLBV Initial Distributions Final Distributions

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Galactic-like DNS population

Data: https://zenodo.org/record/3593844 5

Galactic-like DNS population

Data: https://zenodo.org/record/3593844 5

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DNS Formation

Credit: T. Rebagliato & A. Vigna-Gómez Plots: https://zenodo.org/record/3634498 (69% of all DNSs) 6

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DNS Formation

Credit: T. Rebagliato & A. Vigna-Gómez Plots: https://zenodo.org/record/3634498 (20% of all DNSs) 7

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Distinctive Common-envelope Episodes

Neutron star – Giant donor Single-core common-envelope episode Channel I (~70%) Giant donor – Giant companion Double-core common-envelope episode Channel II (~20%)

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Sub-Populations

Vigna-Gómez+2020 (arXiv:2001.09829) 9

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Synthetic Population

Vigna-Gómez+2020 (arXiv:2001.09829) https://zenodo.org/record/3593844 BLUE: single-core RED: double-core

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Binary Neutron Stars: Achille’s Heel

Fryer Delayed, Z=0.0142

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Two formation channels:

  • Single-core
  • Wide
  • Galactic-like
  • Double-core
  • Merging
  • LISA-like (?)
  • LIGO-like (?)

Conclusions

^“Similar” results with MOBSE, ComBiNe, StarTrack, etc.

DNS merger rates (Gpc^3 yr^−1):

  • GW170817 :

110–3840

  • GW190425 :

250–2810

  • COMPAS^:

240–280

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