1. The Tarantula Massive Binary Monitoring VI: Characterisation of hidden companions in 51 single-lined O-type binaries: A flat mass-ratio distribution and black-hole binary candidates
- Author
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T. Shenar, H. Sana, L. Mahy, J. Maíz Apellániz, Paul A. Crowther, M. Gromadzki, A. Herrero, N. Langer, P. Marchant, F. R. N. Schneider, K. Sen, I. Soszyński, S. Toonen, and Low Energy Astrophysics (API, FNWI)
- Subjects
Science & Technology ,STAR ,GRAVITATIONAL LENSING EXPERIMENT ,FOS: Physical sciences ,ORBITAL ANALYSIS ,Astronomy and Astrophysics ,Astronomy & Astrophysics ,spectroscopic [binaries] ,MULTIPLICITY PROPERTIES ,Astrophysics - Astrophysics of Galaxies ,EVOLUTION ,massive [stars] ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,evolution [stars] ,Physical Sciences ,black holes [stars] ,Magellanic Clouds ,BLANKETED MODEL ATMOSPHERES ,WOLF-RAYET BINARY ,COMPOSITE SPECTRA ,Solar and Stellar Astrophysics (astro-ph.SR) ,SPECTRAL CLASSIFICATION ,SYSTEM - Abstract
We aim to hunt for massive binaries hosting a black hole companion (OB+BH) and establish the natal mass-ratio distribution of massive stars at the subsolar metallicity environment of the Large Magellanic Cloud (LMC). We use the shift-and-add grid disentangling technique to characterize the hidden companions in 51 SB1 O-type and evolved B-type binaries in the LMC monitored in the framework of the Tarantula Massive Binary Monitoring (TMBM). Out of the 51 SB1 systems, 43 (84%) are found to have non-degenerate stellar companions, of which 28 are confident detections, and 15 are less certain (SB1: or SB2:). Of these 43 targets, one is found to be a triple (VFTS 64), and two are found to be quadruples (VFTS 120, 702). The remaining eight targets (16%) retain an SB1 classification. Aside from the unambiguous case of VFTS 243, analysed in detailed in a separate paper, we identify two additional OB+BH candidates: VFTS 514 and VFTS 779. Additional black holes may be present in the sample but at a lower probability. Our study firmly establishes a virtually flat natal mass-ratio distribution for O-type stars at LMC metallicity, covering the entire mass-ratio range (0.05 < q < 1) and periods in the range 0 < log P < 3 [d]. The nature of the OB+BH candidates should be verified through future monitoring, but the frequency of OB+BH candidates is generally in line with recent predictions at LMC metallicity., 41 pages (14 main article + 27 appendix), accepted to A&A
- Published
- 2022