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Monthly Notices of the Royal Astronomical Society
Article . 2024 . Peer-reviewed
License: CC BY
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https://dx.doi.org/10.48550/ar...
Article . 2024
License: CC BY
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The enigmatic origin of two dormant BH binaries: Gaia BH1 and Gaia BH2

Authors: I Kotko; S Banerjee; K Belczynski;

The enigmatic origin of two dormant BH binaries: Gaia BH1 and Gaia BH2

Abstract

ABSTRACT The two systems, namely, Gaia BH1 and Gaia BH2, that have been confirmed as dormant (i.e. no X-ray emission detected) black hole (BH) – low-mass star binaries in the latest Gaia mission data release are intriguing in the context of their formation and evolution. Both systems consist of $\sim 9\, \mathrm{{\rm M}_{\odot }}$ BH and $\sim 1\, \mathrm{{\rm M}_{\odot }}$ star orbiting each other on a wide, eccentric orbit ($e\sim 0.5$). We argue that formation of such Gaia BH-like systems through the isolated binary evolution (IBE) channel, under the standard common envelope assumptions, and from dynamical interactions in young massive and open clusters are equally probable, and that the formation rate of such binaries is of the order of $10^{-7}\, \mathrm{{\rm M}_{\odot }}^{-1}$ for both channels. We estimate that, according to our models, there are at most $\sim 900$ detectable Gaia BH-like binaries in the Milky Way thin disc. What plays an important role in formation of Gaia BH-like systems via the IBE channel is the mutual position of the natal kick velocity vector and the binary angular momentum vector. We find that natal kicks with a median magnitude of $\sim 40$ km s−1 are preferred for the formation of Gaia BH1-like binaries. Approximately 94 per cent of those binaries are formed with the BH spin misaligned to the orbital axis by less than $40^{\circ }$. Gaia BH2-like binaries form if the low-velocity natal kick (of median magnitude $\sim 20$ km s−1) is directed within $15^{\circ }$ about the orbital plane. In addition to natal kick, we also discuss the influence of tidal interaction and the adopted common envelope $\lambda _\mathrm{ce}$ parameter prescription on the evolution of Gaia BH-like binaries. 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.

Keywords

High Energy Astrophysical Phenomena (astro-ph.HE), stars: kinematics and dynamics, FOS: Physical sciences, open clusters and associations: general, Astrophysics - Astrophysics of Galaxies, methods: numerical, binaries: general, Astrophysics - Solar and Stellar Astrophysics, Astrophysics of Galaxies (astro-ph.GA), stars: evolution, Astrophysics - High Energy Astrophysical Phenomena, stars: black holes, Solar and Stellar Astrophysics (astro-ph.SR)

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
9
Top 10%
Average
Top 10%
Green
gold