Formation of carbon-enhanced metal-poor stars in the presence of far ultraviolet radiation

Abstract

Recent discoveries of carbon-enhanced metal-poor stars like SMSS J031300.36-670839.3 provide increasing observational insights into the formation conditions of the first second-generation stars in the Universe, reflecting the chemical conditions after the first supernova explosion. Here, we present the first cosmological simulations with a detailed chemical network including primordial species as well as C, C${}^{+}$, O, O${}^{+}$, Si, Si${}^{+}$, and Si${}^{2+}$ following the formation of carbon-enhanced metal poor stars. The presence of background UV flux delays the collapse from $z=21$ to $z=15$ and cool the gas down to the CMB temperature for a metallicity of Z/Z${}_{\odot }$=10${}^{-3}$. This can potentially lead to the formation of lower mass stars. Overall, we find that the metals have a stronger effect on the collapse than the radiation, yielding a comparable thermal structure for large variations in the radiative background. We further find that radiative backgrounds are not able to delay the collapse for Z/Z${}_{\odot }$=10${}^{-2}$ or a carbon abundance as in SMSS J031300.36-670839.3.

arXiv commentsubmitted to ApJL

References in corpus (44)

• The chemical composition of the Sun
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• A Multi-Code Analysis Toolkit for Astrophysical Simulation Data
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Sky Maps, Systematic Errors, and Basic Results
• Enzo: An Adaptive Mesh Refinement Code for Astrophysics
• Nucleosynthetic signatures of the first stars
• One Hundred First Stars : Protostellar Evolution and the Final Masses
• A stellar relic from the early Milky Way
• Thermal and Fragmentation Properties of Star-forming Clouds in Low-metallicity Environments
• First-generation black-hole-forming supernovae and the metal abundance pattern of a very iron-poor star
• The Formation and Fragmentation of Disks around Primordial Protostars
• A single low-energy, iron-poor supernova as the source of metals in the star SMSS J 031300.36-670839.3
• A new Jeans resolution criterion for (M)HD simulations of self-gravitating gas: Application to magnetic field amplification by gravity-driven turbulence
• Discovery of HE 1523-0901, a Strongly r-Process Enhanced Metal-Poor Star with Detected Uranium
• KROME - a package to embed chemistry in astrophysical simulations
• The First Galaxies: Chemical Enrichment, Mixing, and Star Formation
• The First Stars: Mass Growth Under Protostellar Feedback
• HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
• Photodissociation of H2 in Protogalaxies: Modeling Self-Shielding in 3D Simulations
• The Destruction of Cosmological Minihalos by Primordial Supernovae
• Star formation at very low metallicity. I: Chemistry and cooling at low densities
• Feedback-regulated Super Massive Black Hole Seed Formation
• The First Supernova Explosions: Energetics, Feedback, and Chemical Enrichment
• Metal and molecule cooling in simulations of structure formation
• Metal and molecule cooling in simulations of structure formation
• Three Modes of Metal-Enriched Star Formation in the Early Universe
• Metal Cooling in Simulations of Cosmic Structure Formation
• A UV flux constraint on the formation of direct collapse black holes
• Mining the Galactic Halo for Very Metal-Poor Stars
• Rate of three-body recombination of hydrogen molecules during primordial star formation
• Star Formation in the First Galaxies - II: Clustered Star Formation and the Influence of Metal Line Cooling
• Suppression of HD-cooling in protogalactic gas clouds by Lyman-Werner radiation
• Star formation at very low metallicity. II: On the insignificance of metal-line cooling during the early stages of gravitational collapse
• The formation of massive Pop III stars in the presence of turbulence
• Star Formation at Very Low Metallicity. IV. Fragmentation Does Not Depend on Metallicity for Cold Initial Conditions
• Star Formation at Very Low Metallicity. V. The Greater Importance of Initial Conditions Compared to Metallicity Thresholds
• Fragmentation in the First Galaxies
• The Chemical Imprint of Silicate Dust on the Most Metal-Poor Stars
• Low-metallicity star formation: Relative impact of metals and magnetic fields
• Primordial star formation: relative impact of H2 three-body rates and initial conditions
• Impact of an accurate modeling of primordial chemistry in high resolution studies
• Dark-matter halo mergers as a fertile environment for low-mass Population III star formation
• Supernova explosions in magnetized, primordial dark matter halos
• Over-cooled haloes at z > 10: a route to form low-mass first stars

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