Conditions for the Formation of First-Star Binaries

Abstract

The fragmentation process of primordial-gas cores during prestellar collapse is studied using three-dimensional nested-grid hydrodynamics. Starting from the initial central number density of n \sim10^3 cm^-3, we follow the evolution of rotating spherical cores up to the stellar density n \simeq 10^{22} cm^-3. An initial condition of the cores is specified by three parameters: the ratios of the rotation and thermal energies to the gravitational energy (β_0, and α_0, respectively), and the amplitude of the bar-mode density perturbation (A_ϕ). Cores with rotation β_0 > 10^{-6} are found to fragment during the collapse. The fragmentation condition hardly depends on either the initial thermal energy α_0 or amplitude of bar-mode perturbation A_ϕ. Since the critical rotation parameter for fragmentation is lower than that expected in the first star formation, binaries or multiples are also common for the first stars.

34 pages,14 figures, Submitted to ApJ, For high resolution figures see http://www2.scphys.kyoto-u.ac.jp/~machidam/darkbinary/astro-ph.pdf

References in corpus (38)

• The Formation of the First Star in the Universe
• The Formation of the First Stars. I. The Primordial Star Forming Cloud
• The First Stars
• The Formation of a Star Cluster: Predicting the Properties of Stars and Brown Dwarfs
• Forming the First Stars in the Universe: The Fragmentation of Primordial Gas
• Nucleosynthetic signatures of the first stars
• Single star progenitors of long gamma-ray bursts I: Model grids and redshift dependent GRB rate
• Thermal and Fragmentation Properties of Star-forming Clouds in Low-metallicity Environments
• Formation of Primordial Stars in a LCDM Universe
• The Formation of Close Binary Systems by Dynamical Interactions and Orbital Decay
• Formation of Primordial Protostars
• The impact of magnetic fields on single and binary star formation
• High-Redshift Gamma-Ray Bursts from Population III Progenitors
• Is HE0107-5240 A Primordial Star? -- The Characteristics of Extremely Metal-Poor Carbon-Rich Stars --
• Collapse of Rotating Magnetized Molecular Cloud Cores and Mass Outflows
• The thermodynamics of collapsing molecular cloud cores using smoothed particle hydrodynamics with radiative transfer
• Radiative transfer and the energy equation in SPH simulations of star formation
• Magnetic Fields and Rotations of Protostars
• Cosmological Magnetic Field: a fossil of density perturbations in the early universe
• Collapse and Fragmentation of Rotating Magnetized Clouds. II. Binary Formation and Fragmentation of First Cores
• Fragmentation of a Molecular Cloud Core versus Fragmentation of the Massive Protoplanetary Disk in the Main Accretion Phase
• Directions of Outflows, Disks, Magnetic Fields, and Rotation of YSOs in Collapsing Molecular Cloud Cores
• Collapse and Fragmentation of Rotating Magnetized Clouds. I. Magnetic Flux - Spin Relation
• Accretion onto a Primordial Protostar
• Magnetic field generation from cosmological perturbations
• First MHD Simulation of Collapse and Fragmentation of Magnetized Molecular Cloud Cores
• The stellar content of the Hamburg/ESO survey. I. Automated selection of DA white dwarfs
• Fragmentation and the formation of primordial protostars: the possible role of Collision Induced Emission
• Evolution of Rotating Molecular Cloud Core with Oblique Magnetic Field
• First Stellar Binary Black Holes: Strongest Gravitational Wave Burst Sources
• Dust-cooling--induced Fragmentation of Low-metallicity Clouds
• The First Jet in the Universe: Protostellar Jets from the First Stars
• The mass spectrum of metal-free Stars resulting from photodissociation feedback: A scenario for the formation of low-mass population III stars
• Stability of Dynamically Collapsing Gas Sphere
• Global Nonradial Instabilities of Dynamically Collapsing Gas Spheres
• The Formation of Population III Binaries
• Cosmological Magnetogenesis driven by Radiation Pressure
• The Lack of Gamma-Ray Bursts from Population III Binaries

Cited by in corpus (64)

• The Formation and Fragmentation of Disks around Primordial Protostars
• Protostar Formation in the Early Universe
• The Formation of Population III Binaries from Cosmological Initial Conditions
• The formation of the first stars and galaxies
• Formation of the First Stars
• The first stars: formation of binaries and small multiple systems
• Gravitational fragmentation in turbulent primordial gas and the initial mass function of Population III stars
• Possible Indirect Confirmation of the Existence of Pop III Massive Stars by Gravitational Wave
• Rapidly Accreting Supergiant Protostars: Embryos of Supermassive Black Holes?
• Constraining the Statistics of Population III Binaries
• The first low-mass stars: critical metallicity or dust-to-gas ratio?
• The Effects of Accretion Luminosity upon Fragmentation in the Early Universe
• Formation pathway of Population III coalescing binary black holes through stable mass transfer
• Radiative Feedback from high mass X-ray binaries on the formation of the first galaxies and early reionization
• Merger rate density of Population III binary black holes below, above, and in the pair-instability mass gap
• The detection rate of Inspiral and Quasi-normal modes of Pop III binary black holes which can confirm or refute the General Relativity in the strong gravity region
• Formation and survival of Population III stellar systems
• The Formation of Population III Stars in Gas Accretion Stage: Effects of Magnetic Fields
• Formation sites of Population III star formation: The effects of different levels of rotation and turbulence on the fragmentation behavior of primordial gas
• The importance of magnetic fields for the initial mass function of the first stars
• Predicting the locations of possible long-lived low-mass first stars: Importance of satellite dwarf galaxies
• Magneto-Hydrodynamics of Population III Star Formation
• Star Formation in the First Galaxies - II: Clustered Star Formation and the Influence of Metal Line Cooling
• Protostellar Feedback and Final Mass of the Second-Generation Primordial Stars
• Fitting formulae for evolution tracks of massive stars under extreme metal poor environments for population synthesis calculations and star cluster simulations
• Star Formation at Very Low Metallicity. V. The Greater Importance of Initial Conditions Compared to Metallicity Thresholds
• Binary Formation in Star-Forming Clouds with Various Metallicities
• Variable Accretion Rates and Fluffy First Stars
• The Burst Mode of Accretion in Primordial Protostars
• Accretion Phase of Star Formation in Clouds with Different Metallicities
• Photoevaporation of Circumstellar Disks Revisited: The Dust-Free Case
• Binary Formation with Different Metallicities: Dependence on Initial Conditions
• The impact of non-ideal magnetohydrodynamics on binary star formation
• Effect of metallicity on the gravitational-wave signal from the cosmological population of compact binary coalescences
• Stellar Winds and Coronae of Low-mass Pop. II/III Stars
• Gravitational wave background from population III binaries
• Formation History of Metal-Poor Halo Stars with Hierarchical Model and the Effect of ISM accretion on the Most Metal-Poor Stars
• Formation of massive stars under protostellar radiation feedback: Very metal-poor stars
• Formation of Massive and Wide First-star Binaries in Radiation Hydrodynamics Simulations
• Magnetohydrodynamic effect on first star formation: prestellar core collapse and protostar formation
• Population III star formation in an X-ray background: III. Periodic radiative feedback and luminosity induced by elliptical orbits
• Long gamma-ray burst rate at very high redshift
• Population III stars around the Milky Way
• Growth of Massive Disk and Early Disk Fragmentation in the Primordial Star Formation
• Early-Age Evolution of the Milky Way Related by Extremely Metal-Poor Stars
• Ionization degree and magnetic diffusivity in the primordial star-forming clouds
• On the operation of the chemothermal instability in primordial star-forming clouds
• Can Population III stars be major origins of both merging binary black holes and extremely metal poor stars?
• Metal Pollution of Low-Mass Population III Stars through Accretion of Interstellar Objects like `Oumuamua
• Protostellar-disc fragmentation across all metallicities
• Massive Prestellar Cores in Radiation-magneto-turbulent Simulations of Molecular Clouds
• Primordial protostars accreting beyond the $\Omega \Gamma$-limit: radiation effect around the star-disk boundary
• Gravitational Fragmentation of Extremely Metal-poor Circumstellar Discs
• Star Formation in Relic HII Regions of the First Stars: Binarity and Outflow Driving
• On the effects of rotation in primordial star-forming clouds
• Shell instability of a collapsing dense core
• Condition for dust evacuation from the first galaxies
• Ionization degree and magnetic diffusivity in star-forming clouds with different metallicities
• Simulating the collapse of rotating primordial gas clouds to study the survival possibility of Pop III protostars
• Survey of Orion Disks with ALMA (SODA) III: Disks in wide binary systems in L1641 and L1647
• Population III Star Formation in an X-ray background: I. Critical Halo Mass of Formation and Total Mass in Stars
• Misaligned Circumstellar Disks and Orbital Motion of the Young Binary XZ Tau
• Numerical Study of Polytropes with n=1 and Differential Rotation
• Studying The Effect of Radiation Pressure on Evolution of a Population III Stellar Cluster