The enigmatic origin of two dormant BH binaries: Gaia BH1 and Gaia BH2
I Kotko, S Banerjee, K Belczynski�- arXiv preprint arXiv:2403.13579, 2024 - arxiv.org
I Kotko, S Banerjee, K Belczynski
arXiv preprint arXiv:2403.13579, 2024•arxiv.orgThe two systems that have been confirmed as dormant (no X-ray emission detected) black
hole (BH)-low-mass star binaries (Gaia BH1 and Gaia BH2) in the latest Gaia mission data
release (DR3) are very intriguing in the context of their evolution. Both systems consist of
$\sim 9\mathrm {M_ {\odot}} $ BH and $\sim 1\mathrm {M_ {\odot}} $ star orbiting each other
on a wide, eccentric orbit ($ e\sim 0.5$). We argue that the formation of Gaia BH-like systems
through the isolated binary evolution (IBE) channel under standard common envelope�…
hole (BH)-low-mass star binaries (Gaia BH1 and Gaia BH2) in the latest Gaia mission data
release (DR3) are very intriguing in the context of their evolution. Both systems consist of
$\sim 9\mathrm {M_ {\odot}} $ BH and $\sim 1\mathrm {M_ {\odot}} $ star orbiting each other
on a wide, eccentric orbit ($ e\sim 0.5$). We argue that the formation of Gaia BH-like systems
through the isolated binary evolution (IBE) channel under standard common envelope�…
The two systems that have been confirmed as dormant (no X-ray emission detected) black hole (BH) - low-mass star binaries (Gaia BH1 and Gaia BH2) in the latest Gaia mission data release (DR3) are very intriguing in the context of their evolution. Both systems consist of BH and star orbiting each other on a wide, eccentric orbit (). We argue that the formation of Gaia BH-like systems through the isolated binary evolution (IBE) channel under standard common envelope assumptions and from dynamical interactions in young massive and open clusters is equally probable, and the formation rate of those binaries is on order of in both channels. What plays an important role in formation of Gaia BH-like systems in the case of IBE channel is the mutual position of the natal kick velocity vector and the binary angular momentum vector. We find that the natal kicks of median magnitude km/s are preferred for the formation of Gaia BH1-like binaries. of those binaries is formed with BH spin misaligned to orbital axis by less than . Gaia BH2-like binaries form if the low velocity natal kick (of median magnitude km/s) is directed within about the orbital plane. We follow the subsequent evolution of the binaries once formed as Gaia BH1 and Gaia BH2 systems to investigate their connection with the low-mass X-ray binary population.
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