The binary mass ratio in the black hole transient MAXI J1820+070

Abstract

We present intermediate resolution spectroscopy of the optical counterpart to the black hole X-ray transient MAXI J1820+070 (=ASASSN-18ey) obtained with the OSIRIS spectrograph on the 10.4-m Gran Telescopio Canarias. The observations were performed with the source close to the quiescent state and before the onset of renewed activity in August 2019. We make use of these data and K-type dwarf templates taken with the same instrumental configuration to measure the projected rotational velocity of the donor star. We find $v_{rot}\sin i=84\pm 5$ km s${}^{-1}$ ($1-\sigma$), which implies a donor to black-hole mass ratio $q=M_2/M_1=0.072\pm 0.012$ for the case of a tidally locked and Roche-lobe filling donor star. The derived dynamical masses for the stellar components are $M_1=(5.95\pm 0.22){\sin }^{-3}i$ $M_{\odot }$ and $M_2=(0.43\pm 0.08){\sin }^{-3}i$ $M_{\odot }$. The use of $q$, combined with estimates of the accretion disk size at the time of the optical spectroscopy, allows us to revise our previous orbital inclination constraints to $66^{\circ }<i<81^{\circ }$. These values lead to 95% confidence level limits on the masses of $5.73<M_1(M_{\odot })<8.34$ and $0.28<M_2(M_{\odot })<0.77$. Adopting instead the $63\pm 3^{\circ }$ orientation angle of the radio jet as the binary inclination leads to $M_1=8.48_{-0.72}^{+0.79}{M}_{\odot }$ and $M_2=0.61_{-0.12}^{+0.13}{M}_{\odot }$ ($1-\sigma$).

8 pages, 2 figures. Accepted for publication in ApJL

References in corpus (9)

• A radio parallax to the black hole X-ray binary MAXI J1820+070
• Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070
• X-ray and Optical Monitoring of State Transitions in MAXI J1820+070
• The Soft State of the Black Hole Transient Source MAXI J1820+070: Emission from the Edge of the Plunge Region?
• On the mass of the neutron star in V395 Car/2S 0921-630
• X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
• Broad-band spectral study of X-ray transient MAXI J1820+070 using Swift/XRT and NuSTAR
• Bowen emission from Aquila X-1: evidence for multiple components and constraint on the accretion disc vertical structure
• Tomography of X-ray Nova Muscae 1991: Evidence for ongoing mass transfer and stream-disc overflow

Cited by in corpus (47)

• Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT
• Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-Timing Analysis
• Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• Measuring fundamental jet properties with multi-wavelength fast timing of the black hole X-ray binary MAXI J1820+070
• The NICER "Reverberation Machine": A Systematic Study of Time Lags in Black Hole X-Ray Binaries
• Near-infrared emission lines trace the state-independent accretion disc wind of the black hole transient MAXI J1820+070
• Population Synthesis of Black Hole X-Ray Binaries
• Observations of a black hole X-ray binary indicate formation of a magnetically arrested disk
• A variable corona during the transition from type-C to type-B quasi-periodic oscillations in the black hole X-ray binary MAXI J1820+070
• Physical origin of the nonphysical spin evolution of MAXI J1820+070
• Hard-state optical wind during the discovery outburst of the black-hole X-ray dipper MAXI J1803-298
• Evidence for mass-dependent peculiar velocities in compact object binaries: Towards better constraints on natal kicks
• New mass-loss rates of B supergiants from global wind models
• Discovery of optical outflows and inflows in the black hole candidate GRS 1716-249
• A timing-based estimate of the spin of the black hole in MAXI J1820+070
• A NICER look at the jet-like corona of MAXI J1535-571 through type-B quasi-periodic oscillations
• A detailed view of low-frequency quasi-periodic oscillation in the broadband 0.2-200 keV with Insight-HXMT and NICER
• Observations of the Disk/Jet Coupling of MAXI J1820+070 During its Descent to Quiescence
• Delimiting the black hole mass in the X-ray transient MAXI J1659-152 with H$\alpha$ spectroscopy
• A Phase-resolved View of the Low-frequency Quasiperiodic Oscillations from the Black Hole Binary MAXI J1820+070
• The intermediate polar cataclysmic variable GK Persei 120 years after the nova explosion: a first dynamical mass study
• The origin of optical emission lines in the soft state of X-ray binary outbursts: the case of MAXI J1820+070
• Accretion Scenario of MAXI J1820+070 during 2018 Outbursts with Multi-mission Observations
• The Donor of the Black-Hole X-Ray Binary MAXI J1820+070
• Low Frequency Quasi-periodic Oscillation in MAXI J1820+070: Revealing distinct Compton and Reflection Contributions
• Gamma-ray observations of MAXI J1820+070 during the 2018 outburst
• X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state
• A possible overall scenario for the outburst evolution of MAXI J1820+070 revealed by Insight-HXMT
• An Overview of Compact Star Populations and Some of Its Open Problems
• The prototype X-ray binary GX 339-4: using TeV gamma-rays to assess LMXBs as Galactic cosmic ray accelerators
• Back to business: SLX 1746--331 after 13 years of silence
• Multiwavelength Observations of the Black Hole X-ray Binary MAXI J1820$+$070 in the Rebrightening Phase
• Intermittent QPO properties of MAXI J1820+070 revealed by Insight-HXMT
• The population of NuSTAR Black Hole X-ray Binaries
• Evolution of Accretion Disk Structure of the Black Hole X-ray Binary MAXI J1820$+$070 during the Rebrightening Phase
• Variable QPO lags and reduced coherence between the disc and corona in MAXI J1820+070
• X-ray Binaries: a potential dominant contributor to the cosmic ray spectral knee structure
• The Accretion-Ejection Connection in the Black Hole X-ray Binary MAXI J1820$+$070
• Investigating the consistency of the shape and flux of X-ray reflection spectra in the hard state with an accretion disk reaching close to the black hole
• Tracking optical variability and outflows across the accretion states of the black hole transient MAXI J1820+070
• Ultraviolet spectroscopy of the black hole X-ray binary MAXI J1820+070 across a state transition
• Optical and X-ray timing analysis of the 2018-2020 outburst and rebrightening of the black-hole transient MAXI J1820+070
• On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow
• Evolution of X-ray and optical rapid variability during the low/hard state in the 2018 outburst of MAXI J1820+070 = ASASSN-18ey
• Large optical modulations during 2018 outburst of MAXI J1820+070 reveal evolution of warped accretion disc through X-ray state change
• Optical polarimetry of the accreting black hole X-ray binary Swift J1727.8$-$1613 over the state transition and radio ejections
• Empirical correlation between masses of black holes and Wolf-Rayet stars derived from their mass distributions in spectroscopic binaries