The Donor of the Black-Hole X-Ray Binary MAXI J1820+070

Abstract

We estimate the parameters of the donor of the accreting black-hole binary MAXI J1820+070. The measured values of the binary period, rotational and radial velocities and constraints on the orbital inclination imply the donor is a subgiant with the mass of $M_2\approx 0.49_{-0.10}^{+0.10}{M}_{\odot }$ and the radius of $R_2\approx 1.19_{-0.08}^{+0.08}{R}_{\odot }$. We re-analyze the previously obtained optical spectrum from the Gran Telescopio Canarias, and found it yields a strict lower limit on the effective temperature of $T>4200$ K. We compile optical and infrared fluxes observed during the quiescence of this system. From the minima $r$ and $i$-band fluxes found in Pan-STARSS1 Data Release 2 pre-discovery imaging and for a distance of $D\approx 3$ kpc, reddening of $E(B$--$V)=0.23$ and $R_2\approx 1.11R_{\odot }$, we find $T\lesssim 4230$ K, very close to the above lower limit. For a larger distance, the temperature can be higher, up to about 4500 K (corresponding to a K5 spectral type, preferred by previous studies) at $D=3.5$ kpc, allowed by the Gaia parallax. We perform evolutionary calculations for the binary system and compare them to the observational constraints. Our model fitting the above temperature and radius constraints at $D\approx 3$ kpc has the mass of $0.4M_{\odot }$, $T\approx 4200$ K and solar metallicity. Two alternative models require $D\gtrsim 3.3$--3.4 kpc at $0.4M_{\odot }$, $T\approx 4500$ K and half solar metallicity, and $0.5M_{\odot }$, $T\approx 4300$ K and solar metallicity. These models yield mass transfer rates of $\sim 10^{-10}{M}_{\odot }$/yr, compatible with those based on the estimated accreted mass of $\approx 2\times 10^{25}$ g and the time between the 2018 discovery and the 1934 historical outburst.

arXiv commentApJ, in press

References in corpus (35)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• The USNO-B Catalog
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
• The Second-Generation Guide Star Catalog: Description and Properties
• The disc instability model for X-ray transients: evidence for truncation and irradiation
• A First Constraint on the Thick Disk Scale Length: Differential Radial Abundances in K Giants at Galactocentric Radii 4, 8, and 12 kpc
• Potential Kick Velocity distribution of black hole X-ray binaries and implications for natal kicks
• A radio parallax to the black hole X-ray binary MAXI J1820+070
• Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system
• Signatures of SN Ia in the galactic thick disk
• The binary mass ratio in the black hole transient MAXI J1820+070
• MAXI J1820+070 with NuSTAR I. An increase in variability frequency but a stable reflection spectrum: coronal properties and implications for the inner disc in black hole binaries
• Opening angles, Lorentz factors and confinement of X-ray binary jets
• ASASSN-18ey: The Rise of a New Black-Hole X-ray Binary
• Dynamical confirmation of a black hole in MAXI J1820+070
• Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-Timing Analysis
• 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
• Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• The Soft State of the Black Hole Transient Source MAXI J1820+070: Emission from the Edge of the Plunge Region?
• The Varying Kinematics of Multiple Ejecta from the Black Hole X-ray Binary MAXI J1820+070
• The X-ray binary GX 339-4/V821 Ara: the distance, inclination, evolutionary status and mass transfer
• Black hole spin-orbit misalignment in the X-ray binary MAXI J1820+070
• X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
• Infrared Spectroscopy of Symbiotic Stars. XII. The Neutron Star SyXB System 4U 1700+24 = V934 Herculis
• Non-conservative mass transfer in stellar evolution and the case of V404 Cyg/GS 2023+338
• Broad-band spectral study of X-ray transient MAXI J1820+070 using Swift/XRT and NuSTAR
• Chemical abundance analysis of symbiotic giants - III. Metallicity and CNO abundance patterns in 24 southern systems
• Chemical abundance analysis of 13 southern symbiotic giants from high-resolution spectra at ~1.56 μm
• The mass, luminosity and mass-loss rate of the donor of the V1487 Aql/GRS 1915+105 binary system

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• Investigating Dynamical Properties of Globular Clusters through a Family of Lowered Isothermal Models
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