First Star Survivors as Metal-Rich Halo Stars that Experienced Supernova Explosions in Binary Systems
arXiv:2103.13627 · doi:10.1093/pasj/psab024
Abstract
The search for the first stars formed from metal-free gas in the universe is one of the key issues in astronomy because it relates to many fields, such as the formation of stars and galaxies, the evolution of the universe, and the origin of elements. It is not still clear if metal-free first stars can be found in the present universe. These first stars are thought to exist among extremely metal-poor stars in the halo of our Galaxy. Here we propose a new scenario for the formation of low-mass first stars that have survived until today and observational counterparts in our Galaxy. The first stars in binary systems, consisting of massive- and low-mass stars, are examined using stellar evolution models, simulations of supernova ejecta colliding with low-mass companions, and comparisons with observed data. These first star survivors will be observed as metal-rich halo stars in our Galaxy. We may have identified a candidate star in the observational database where elemental abundances and kinematic data are available. Our models also account for the existence of several solar-metallicity stars in the literature having space velocities equivalent to the halo population. The proposed scenario demands a new channel of star formation in the early universe and is a supplementary scenario for the origin of the known metal-poor stars.
41 pages, 14 figures, accepted for publication in PASJ (to be published in open access)
References in corpus (41)
- Multi-messenger Observations of a Binary Neutron Star Merger
- Carbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars
- A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars
- First stars VI - Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements
- Modelling discontinuities and Kelvin-Helmholtz instabilities in SPH
- An extremely primitive halo star
- The Mass Spectrum of the First Stars
- HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
- The Destruction of Cosmological Minihalos by Primordial Supernovae
- Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars
- TOPoS: II. On the bimodality of carbon abundance in CEMP stars. Implications on the early chemical evolution of galaxies
- HE 1327-2326, an unevolved star with [Fe/H]<-5.0. II. New 3D-1D corrected abundances from a VLT/UVES spectrum
- An Elemental Assay of Very, Extremely, and Ultra Metal-Poor Stars
- The Triple-Ring Nebula around SN1987A: Fingerprint of a binary merger
- Carbon-Enhanced Metal-Poor Stars. III. Main-Sequence Turn-Off Stars from the SDSS/SEGUE Sample
- High-Resolution Spectroscopic Study of Extremely Metal-Poor Star Candidates from the SkyMapper Survey
- Aspherical Properties of Hydrodynamics and Nucleosynthesis in Jet-induced Supernovae
- The impact of type Ia supernovae on main sequence binary companions
- First stars X. The nature of three unevolved Carbon-Enhanced Metal-Poor stars
- Origin of the excess of high-energy retrograde stars in the Galactic halo
- Limits on Pop III star formation with the most iron-poor stars
- Merge or survive: Number of Population III stars per minihalo
- High-resolution abundance analysis of very metal-poor r-I stars
- Lithium abundances in CEMP stars
- On the Numerical Treatment and Dependence of Thermohaline Mixing in Red Giants
- The AMBRE Project: Constraining the lithium evolution in the Milky Way
- The Hobby-Eberly Telescope "Chemical Abundances of Stars in the Halo" (CASH) Project. I. The Lithium-, s-, and r-Enhanced Metal-Poor Giant HKII 17435-00532
- Simulating Neutron Star Mergers as r-process Sources in Ultra Faint Dwarf Galaxies
- Characterizing the High-Velocity Stars of RAVE: The Discovery of a Metal-Rich Halo Star Born in the Galactic Disk
- Classification of extremely metal-poor stars: absent region in A(C)-[Fe/H] plane and the role of dust cooling
- Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era
- Enormous Li-enhancement preceding red giant phases in low-mass stars in the Milky Way halo
- Following The Cosmic Evolution Of Pristine Gas I: Implications For Milky Way Halo Stars
- Beryllium abundances in metal-poor stars
- Enrichment in r-process elements from multiple distinct events in the early Draco dwarf spheroidal galaxy
- High-resolution spectroscopy of extremely metal-poor stars from SDSS/SEGUE. III. Unevolved Stars with
- The AMBRE project: a study of Li evolution in the Galactic thin and thick discs
- TOPoS: III. An ultra iron-poor multiple CEMP system
- Beryllium in Ultra-Lithium-Deficient Halo Stars - The Blue Straggler Connection
- Smoothed Particle Hydrodynamics with Smoothed Pseudo-Density
- Does the structure of Pop III supernova ejecta affect the elemental abundance of extremely metal-poor stars?