2021/04/30 by D. Mata Sánchez, A. Rau, Alfonso Miguel García Hernández +4 · 28 citations
Engineering · Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Binary number #Black hole (networking) #Compact star #Light curve #Mechanics and Biomechanics Studies #Neutron star #Orbital inclination #Physics #Pulsars and Gravitational Waves Research #Stars #Supernova #X-ray binary #astro-ph.HE
paper · pdf · doi:10.1093/mnras/stab1714
published in Monthly Notices of the Royal Astronomical Society 506(1), 581-594 (Oxford University Press) · 14 pages, 6 figures. Submitted to MNRAS
openalex created_date 2021/04/26 · openalex publication_date 2021/06/15 · arxiv created 2021/06/28 · arxiv updated 2021/06/30 · openalex updated_date 2026/08/06
ABSTRACT MAXI J1305-704 has been proposed as a high-inclination candidate black hole X-ray binary in view of its X-ray properties and dipping behaviour during outburst. We present photometric and spectroscopic observations of the source in quiescence that allow us to reveal the ellipsoidal modulation of the companion star and absorption features consistent with those of an early K-type star (T\rm eff=4610+130-160 \rm K). The central wavelengths of the absorption lines vary periodically at P\rm orb=0.394± 0.004 \rm d with an amplitude of K2=554± 8 \rm km s-1. They imply a mass function for the compact object of f(M1)=6.9± 0.3 \rm M_\odot, confirming its black hole nature. The simultaneous absence of X-ray eclipses and the presence of dips set a conservative range of allowed inclinations 60 \rm deg\lt i\lt 82 \rm deg, while modelling of optical light curves further constrain it to i=72+5-8 \rm deg. The above parameters together set a black hole mass of M1= 8.9-1.0+1.6 \rm M\odot and a companion mass of M2= 0.43± 0.16 \rm M\odot , much lower than that of a dwarf star of the observed spectral type, implying it is evolved. Estimates of the distance to the system (d=7.5+1.8-1.4 \rm kpc) and space velocity (v\rm space=270± 60 \rm km s-1) place it in the Galactic thick disc and favour a significant natal kick during the formation of the BH if the supernova occurred in the Galactic Plane.