Common-envelope episodes that lead to double neutron star - - PowerPoint PPT Presentation

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Common-envelope episodes that lead to double neutron star - - PowerPoint PPT Presentation

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Common-envelope episodes that lead to double neutron star formation Alejandro Vigna-Gmez Lund 2020 Compact Objects For All 1 Population Synthesis Initial Distributions p(M 1 ,q,e,a) ZAMS f acc V kick Mass M rem Supernovae Transfer

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Common-envelope episodes that lead to double neutron star formation

Alejandro Vigna-Gómez

Lund 2020 Compact Objects For All

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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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Common-Envelope Episodes (CEEs)

Credit: Philip D. Hall

ejection merger time

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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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DNS Formation

Credit: T. Rebagliato & A. Vigna-Gómez https://zenodo.org/record/3634498 (69% of all DNSs) 4

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DNS Formation

Credit: T. Rebagliato & A. Vigna-Gómez https://zenodo.org/record/3634498 (20% of all DNSs) 5

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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) 7

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Galactic-like DNS population

https://zenodo.org/record/3593844 8

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Summary of Uncertainties Two formation channels:

  • Single-core vs double-core

DNS merger rates (Gpc^3 yr^−1):

  • GW170817 :

110–3840

  • GW190425 :

250–2810

  • COMPAS^:

240–280

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

Conclusions

Wild Extrapolations Wide DNSs:

  • Galactic-like
  • Single-core
  • Non-merging (ish)

Close DNSs:

  • LIGO/LISA-like
  • Double-core
  • Merging (ish)

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Author arXiv Binary Physics BBHs DNSs Statistics Cosmic History Rates Data Only Barrett+2017 1704.03781 X X Barrett+2018 1711.06287 X X X Bavera+2019 1906.12257 X X X X X Broekgaarden+2019 1905.00910 X X X Chattopadhyay+2019 1912.02415 X X Howitt+2019 1912.07771 X Lau+2019 1910.12422 X X X Neijssel+2019 1906.08136 X X X Schrøder+2019 1906.04189 X X Stevenson+2017 1704.01352 X X Stevenson+2019 1904.02821 X X X Vigna-Gomez+2018 1805.07974 X X X X X Vigna-Gomez+2020 2001.09829 X X X

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