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Constraints on the binary black hole hypothesis for system LB-1 · Around

2019

Constraints on the binary black hole hypothesis for system LB-1

Shen, R. -F., Matzner, C. D., Howard, A. W. et al.

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At about 70 solar masses, the recently-discovered dark object orbited by a B-type star in the system LB-1 is difficult to understand as the end point of standard stellar evolution, except as a binary black hole (BBH).

LB-1 shows a strong, broad H-alpha emission line that is best attributed to a gaseous disk surrounding the dark mass.
We use the observed H-alpha line shape, particularly its wing extension, to constrain the inner radius of the disk and thereby the separation of a putative BBH.
The hypothesis of a current BBH is effectively ruled out on the grounds that its merger time must be a small fraction of the current age of the B star.

Built on

Leung S.-C., Nomoto K., Blinnikov S., 2019, Preprint arXiv:1901.11136
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