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

Common-envelope episodes that lead to double neutron star formation Alejandro Vigna-Gómez Lund 2020 Compact Objects For All

1 Population Synthesis Initial Distributions p(M 1 ,q,e,a) ZAMS f acc V kick Mass γ M rem Supernovae Transfer Common Winds Envelope λ f WR α f LBV p(M 1 ,q,e,a) DNS Final Distributions

2 Common-Envelope Episodes (CEEs) time ejection merger Credit: Philip D. Hall

3 • 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

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

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

6 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%)

7 Sub-Populations Vigna-Gómez+2020 (arXiv:2001.09829)

8 Galactic-like DNS population https://zenodo.org/record/3593844

9 Conclusions Summary of Uncertainties Wild Extrapolations Two formation channels: Wide DNSs: • Single-core vs double-core • Galactic-like DNS merger rates (Gpc^3 yr^ − 1): • Single-core • GW170817 : 110–3840 • Non-merging (ish) • GW190425 : 250–2810 Close DNSs: • COMPAS^: 240–280 • LIGO/LISA-like • Double-core ^“Similar” results with MOBSE, • Merging (ish) ComBiNe, StarTrack, etc.

Author arXiv Binary BBHs DNSs Statistics Cosmic Rates Data Physics History 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