This is a preview of subscription content, access via your institution
Access Nature and 54 other Nature Portfolio journals
Get Nature+, our best-value online-access subscription
$29.99 / 30 days
cancel any time
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Rent or buy this article
Prices vary by article type
Prices may be subject to local taxes which are calculated during checkout
The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.
Liu, J. et al. A wide star–black-hole binary system from radial-velocity measurements. Nature 575, 618–621 (2019).
Belczynski, K. et al. The formation of a 70-M☉ black hole at high metallicity. Astrophys. J. 890, 113–859 (2020).
Groh, J. H. et al. Massive black holes regulated by luminous blue variable mass loss and magnetic fields – implications for the progenitor of LB-1. Preprint at http://arXiv.org/abs/1912.00994 (2019).
Ziółkowski, J. Evolutionary constraints on the masses of the components of the HDE 226868/Cyg X-1 binary system. Mon. Not. R. Astron. Soc. 358, 851–859 (2005).
Casares, J. et al. A Be-type star with a black-hole companion. Nature 505, 378–381 (2014).
Abbott, B. P. et al. GWTC-1: a gravitational-wave transient catalog of compact binary mergers observed by LIGO and Virgo during the first and second observing runs. Phys. Rev. X 9, 031040 (2019).
Raskin, G. et al. HERMES: a high-resolution fibre-fed spectrograph for the Mercator telescope. Astron. Astrophys. 526, A69 (2011).
El-Badry, K. & Quataert, E. Not so fast: LB-1 is unlikely to contain a 70 M☉ black hole. Mon. Not. R. Astron. Soc. 493, L22–L27 (2020).
Tkachenko, A. Grid search in stellar parameters: a software for spectrum analysis of single stars and binary systems. Astron. Astrophys. 581, A129 (2015).
Simón-Díaz, S. et al. A detailed non-LTE analysis of LB-1: revised parameters and surface abundances. Astron. Astrophys. 634, L7 (2020).
Lanz, T. & Hubeny, I. A grid of non-LTE line-blanketed model atmospheres of O-type stars. Astrophys. J. Suppl. Ser. 146, 417–441 (2003).
Schneider, F. R. N. et al. Bonnsai: a Bayesian tool for comparing stars with stellar evolution models. Astron. Astrophys. 570, A66 (2014).
Brott, I. et al. Rotating massive main-sequence stars. I. Grids of evolutionary models and isochrones. Astron. Astrophys. 530, A115 (2011).
Condori, C. A. H. et al. The study of unclassified B[e] stars and candidates in the Galaxy and Magellanic Clouds. Mon. Not. R. Astron. Soc. 488, 1090–1110 (2019).
Kamath, D. et al. Optically visible post-AGB stars, post-RGB stars and young stellar objects in the Large Magellanic Cloud. Mon. Not. R. Astron. Soc. 454, 1468–1502 (2015).
We acknowledge support from the Fonds Wetenschappelijk Onderzoek (FWO, Research Foundation Flanders) under project IDs G0F8H6N, G0B3818N, 12ZY520N, G0H5416N and GST-D6267-I002519N, and from the Onderzoeksraad (Research Council), KU Leuven under project IDs C16/17/007, C16/18/005 and C14/17/082. This project received funding from the European Research Council under the European Union’s Horizon 2020 research and innovation programme (grant agreement numbers 772225 MULTIPLES and 670519 MAMSIE).
The authors declare no competing interests.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended data figures and tables
a, b, Top, best atmosphere model adjusted using the Grid Search in Stellar Parameters (GSSP) fitting suite (red) overlaid on the observed HERMES spectrum (black); and bottom, residuals of the fit. a and b each show a different small portion of the spectrum around the diagnostic lines of interest.
a–d, Chi-squared maps of the GSSP atmosphere fitting projected on the one-dimensional parameter space for effective temperature (a), surface gravity (b), projected rotational velocity (c) and metallicity (d). The black data points are models, the blue solid and black dotted lines show linear and cubic interpolations through the best-fit grid points, respectively, and the horizontal red line corresponds to the adopted 1σ confidence threshold.
About this article
Cite this article
Abdul-Masih, M., Banyard, G., Bodensteiner, J. et al. On the signature of a 70-solar-mass black hole in LB-1. Nature 580, E11–E15 (2020). https://doi.org/10.1038/s41586-020-2216-x
This article is cited by
Science China Physics, Mechanics & Astronomy (2023)
An X-ray-quiet black hole born with a negligible kick in a massive binary within the Large Magellanic Cloud
Nature Astronomy (2022)