Speaker
Mr
Ying Qin
(Geneva Observatory)
Description
For the “classical” isolated binary evolution, we ran an extensive grid of BH(Black hole)-He star binary evolution tracks, keeping track of the angular momentum evolution of the He star. For a He star with a compact object companion in a close orbit, tides can be efficient only when the orbital period is shorter than ~2 days. Based on the direct-collapse model (no angular momentum loss during the core-collapse), we find that the spin of the second-born BH covers the whole range of the BH spins (i.e. from 0 to 1), and that a weak inverse correlation exists between the merger timescale and the spin of the second-born BH.
Primary author
Mr
Ying Qin
(Geneva Observatory)
Co-authors
Dr
Fragos Tassos
(Geneva Observatory)
Prof.
Georges Meynet
(Geneva Observatory)
