No signature of the orbital motion of a putative 70 solar mass black hole in LB-1

Abstract

Liu et al. (2019) recently reported the detection of a 68 [+11/-13] solar mass (Msun) black hole (BH) paired with an 8.2 [+0.9/-1.2] Msun B-type sub-giant star in the 78.9-day spectroscopic binary system LB-1. Such a black hole is over twice as massive as any other known stellar-mass black hole with non-compact companions2 and its mass approaches those that result from BH-BH coalescences that are detected by gravitational wave interferometers. Its presence in a solar-like metallicity environment challenges conventional theories of massive binary evolution, stellar winds and core-collapse supernovae, so that more exotic scenarios seem to be needed to explain the existence and properties of LB-1. Here, we show that the observational diagnostics used to derive the BH mass results from the orbital motion of the B-type star, not that of the BH. As a consequence, no evidence for a massive BH remains in the data, therefore solving the existing tension with formation models of such a massive BH at solar metallicity and with theories of massive star evolution in general.

10 pages, 8 figures

References in corpus (7)

• A wide star-black-hole binary system from radial-velocity measurements
• BONNSAI: a Bayesian tool for comparing stars with stellar evolution models
• Not so fast: LB-1 is unlikely to contain a 70 $M_{\odot }$ black hole
• The Formation of a 70 Msun Black Hole at High Metallicity
• A detailed non-LTE analysis of LB-1: Revised parameters and surface abundances
• The study of unclassified B[e] stars and candidates in the Galaxy and Magellanic Clouds
• Massive black holes regulated by luminous blue variable mass loss and magnetic fields

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