The R-Process Alliance: Abundance Universality among Some Elements at and between the First and Second R-Process Peaks

Abstract

We present new observational benchmarks of rapid neutron-capture process (r-process) nucleosynthesis for elements at and between the first (A ~ 80) and second (A ~ 130) peaks. Our analysis is based on archival ultraviolet and optical spectroscopy of eight metal-poor stars with Se (Z = 34) or Te (Z = 52) detections, whose r-process enhancement varies by more than a factor of 30 (-0.22 <= [Eu/Fe] <= +1.32). We calculate ratios among the abundances of Se, Sr through Mo (38 <= Z <= 42), and Te. These benchmarks may offer a new empirical alternative to the predicted solar system r-process residual pattern. The Te abundances in these stars correlate more closely with the lighter r-process elements than the heavier ones, contradicting and superseding previous findings. The small star-to-star dispersion among the abundances of Se, Sr, Y, Zr, Nb, Mo, and Te (<= 0.13 dex, or 26%) matches that observed among the abundances of the lanthanides and third r-process-peak elements. The concept of r-process universality that is recognized among the lanthanide and third-peak elements in r-process-enhanced stars may also apply to Se, Sr, Y, Zr, Nb, Mo, and Te, provided the overall abundances of the lighter r-process elements are scaled independently of the heavier ones. The abundance behavior of the elements Ru through Sn (44 <= Z <= 50) requires further study. Our results suggest that at least one relatively common source in the early Universe produced a consistent abundance pattern among some elements spanning the first and second r-process peaks.

arXiv comment16 pages, 3 figures, including 4 appendices. Published in the Astrophysical Journal

References in corpus (115)

• The NumPy array: a structure for efficient numerical computation
• The chemical composition of the Sun
• Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
• Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
• The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
• Origin of the Heaviest Elements: the Rapid Neutron-Capture Process
• Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
• Neutrino-induced nucleosynthesis of A>64 nuclei: The nu p-process
• Presupernova evolution and explosive nucleosynthesis of rotating massive stars in the metallicity range -3 <=[Fe/H]<= 0
• Opacities and Spectra of the r-process Ejecta from Neutron Star Mergers
• Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-Poor Giants
• Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?
• The Extremely Metal-Poor, Neutron-Capture-Rich Star CS 22892-052: A Comprehensive Abundance Analysis
• The Hamburg/ESO R-process Enhanced Star survey (HERES) II. Spectroscopic analysis of the survey sample
• Abundances and Kinematics of Field Halo and Disk Stars I: Observational Data and Abundance Analysis
• A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars
• Identification of strontium in the merger of two neutron stars
• Protoneutron star evolution and the neutrino driven wind in general relativistic neutrino radiation hydrodynamics simulations
• R-process enrichment from a single event in an ancient dwarf galaxy
• Collapsars as a major source of r-process elements
• Spectroscopic Studies of Extremly Metal-Poor Stars with Subaru/HDS:II.The r-process Elements, Including Thorium
• Detailed Abundances for 28 Metal-poor Stars: Stellar Relics in the Milky Way
• Neutron Star Mergers and Nucleosynthesis of Heavy Elements
• First Stars VIII -- Enrichment of the neutron-capture elements in the early Galaxy
• The Chemical Composition and Age of the Metal-Poor Halo Star BD +17^\circ 3248
• The r-process nucleosynthesis in the various jet-like explosions of magnetorotational core-collapse supernovae
• Galactic Chemical Evolution and solar s-process abundances: dependence on the 13C-pocket structure
• The Abundances of Neutron Capture Species in the Very Metal-Poor Globular Cluster M15: An Uniform Analysis of RGB and RHB Stars
• High-Resolution Spectroscopy of Extremely Metal-Poor Stars in the Least Evolved Galaxies: Ursa Major II and Coma Berenices
• The long-term evolution of neutron star merger remnants - I. The impact of r-process nucleosynthesis
• The r-Process Enriched Low Metallicity Giant HD 115444
• Stellar evolution with rotation XII: Pre-supernova models
• Abundances of 30 elements in 23 metal-poor stars
• Neutron Star Mergers Might not be the Only Source of r-Process Elements in the Milky Way
• The s-Process in Low Metallicity Stars. II. Interpretation of High-Resolution Spectroscopic Observations with AGB models
• $s$-process production in rotating massive stars at solar and low metallicities
• Near-UV Observations of HD221170: New Insights into the Nature of r-Process-Rich Stars
• The long-term evolution of neutron star merger remnants - II. Radioactively powered transients
• Neutron-capture elements in the very metal-poor star HD122563
• Charged-Particle and Neutron-Capture Processes in the High-Entropy Wind of Core-Collapse Supernovae
• Production of Light Element Primary Process nuclei in neutrino-driven winds
• New Rare Earth Element Abundance Distributions for the Sun and Five r-Process-Rich Very Metal-Poor Stars
• The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating stars
• The Role of Fission in Neutron Star Mergers and its Impact on the r-Process Peaks
• Spectroscopic Studies of Very Metal-Poor Stars with the Subaru High Dispersion Spectrograph. III. Light Neutron-Capture Elements
• From Nuclei to the Cosmos: Tracing Heavy-Element Production with the Oldest Stars
• The r-process in proto-neutron-star wind revisited
• Production of the entire range of r-process nuclides by black hole accretion disc outflows from neutron star mergers
• Nucleosynthesis in the Innermost Ejecta of Neutrino-Drive Supernova Explosions in Two Dimensions
• Explorations of the r-Processes: Comparisons between Calculations and Observations of Low-Metallicity Stars
• Chemical abundances of the Milky Way thick disk and stellar halo II.: sodium, iron-peak and neutron-capture elements
• Nucleosynthesis in the Early Galaxy
• Neutrino-driven wind simulations and nucleosynthesis of heavy elements
• New limit of ${}^{244}$Pu on Earth points to rarity of actinide nucleosynthesis
• Detailed Chemical Abundances in the r-Process-Rich Ultra-Faint Dwarf Galaxy Reticulum 2
• Detection of Elements at All Three r-process Peaks in the Metal-Poor Star HD 160617
• Silver and palladium help unveil the nature of a second r-process
• Neutron-capture elements in the very metal-poor star HD88609: another st ar with excesses of light neutron-capture elements
• Integrated Nucleosynthesis in Neutrino Driven Winds
• New Hubble Space Telescope Observations of Heavy Elements in Four Metal-Poor Stars
• Chemical evolution with rotating massive star yields II. A new assessment of the solar s- and r- process components
• JINAbase: A database for chemical abundances of metal-poor stars
• Short-lived ${}^{244}$Pu Points to Compact Binary Mergers as Sites for Heavy r-process Nucleosynthesis
• An R-process enhanced star in the dwarf galaxy Tucana III
• HST Observations of Heavy Elements in Metal-Poor Galactic Halo Stars
• The 12C + 12C reaction and the impact on nucleosynthesis in massive stars
• A line-binned treatment of opacities for the spectra and light curves from neutron star mergers
• The s-process in the Galactic halo: the fifth signature of spinstars in the early Universe?
• The $R$-Process Alliance: Fourth Data Release from the Search for $r$-Process-Enhanced Stars in the Galactic Halo
• Fingerprints of heavy element nucleosynthesis in the late-time lightcurves of kilonovae
• Chemical Abundances in the Ultra-Faint Dwarf Galaxies Grus I and Triangulum II: Neutron-Capture Elements as a Defining Feature of the Faintest Dwarfs
• Global non-spherical oscillations in 3-D $4\pi$ simulations of the H-ingestion flash
• First stars XVI. STIS/HST abundances of heavy-elements in the uranium-rich star CS 31082-001
• Kilonovae across the nuclear physics landscape: The impact of nuclear physics uncertainties on r-process-powered emission
• Modeling Kilonova Light Curves: Dependence on Nuclear Inputs
• The Hamburg/ESO R-process Enhanced Star survey (HERES) IV. Detailed abundance analysis and age dating of the strongly r-process enhanced stars CS 29491-069 and HE 1219-0312
• Abundances of Sr, Y, and Zr in Metal-Poor Stars and Implications for Chemical Evolution in the Early Galaxy
• linemake: An Atomic and Molecular Line List Generator
• The R-Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-Poor Star with an Extreme R-Process Enhancement of [Eu/H] = -0.14
• Relative contributions of the weak, main and fission-recycling r-process
• Californium-254 and kilonova light curves
• The Diverse Origins of Neutron-Capture Elements in the Metal-Poor Star HD 94028: Possible Detection of Products of i-process Nucleosynthesis
• The r-process in the early Galaxy
• The Hamburg/ESO R-process Enhanced Star survey (HERES). V. Detailed abundance analysis of the r-process enhanced star HE 2327-5642
• Non standard s-process in massive rotating stars. Yields of $10-150$ $M_{\odot }$ models at $Z=10^{-3}$
• The R-Process Alliance: 2MASS J09544277+5246414, the Most Actinide-Enhanced R-II Star Known
• Pop III $\text{i}$-process Nucleosynthesis and the Elemental Abundances of SMSS J0313-6708 and the Most Iron-Poor Stars
• The Hamburg/ESO R-process Enhanced Star survey (HERES) X. HE 2252-4225, one more r-process enhanced and actinide-boost halo star
• R-Process elements from magnetorotational hypernovae
• High-resolution abundance analysis of very metal-poor r-I stars
• Nine New Metal-Poor Stars on the Subgiant and Red Horizontal Branches with High Levels of r-process Enhancement
• New Abundance Determinations of Cadmium, Lutetium, and Osmium in the r-process Enriched Star BD+173248
• New Neutron-Capture Site in Massive Pop III and Pop II Stars as a Source for Heavy Elements in the Early Galaxy
• Core-collapse Supernova Explosions Driven by the Hadron-quark Phase Transition as a Rare $r$-process Site
• The landscape of disk outflows from black hole - neutron star mergers
• Extreme Enhancements of r-process Elements in the Cool Metal-Poor Main-Sequence Star SDSS J2357-0052
• Galactic Chemical Evolution: the Impact of the 13C-pocket Structure on the s-process Distribution
• New Detections of Arsenic, Selenium, and Other Heavy Elements in Two Metal-Poor Stars
• Uncertainties in s-process nucleosynthesis in massive stars determined by Monte Carlo variations
• Detection of the Second r-process Peak Element Tellurium in Metal-Poor Stars
• Germanium, Arsenic, and Selenium Abundances in Metal-Poor Stars
• i-Process Contribution of Rapidly Accreting White Dwarfs to the Solar Composition of First-Peak Neutron-Capture Elements
• Evidence for $\gtrsim 4$ Gyr timescales of neutron star mergers from Galactic archaeology
• Co-production of light and heavy $r$-process elements via fission deposition
• Abundance patterns of the light neutron-capture elements in very and extremely metal-poor stars
• Stellar abundances and presolar grains trace the nucleosynthetic origin of molybdenum and ruthenium
• Using failed supernovae to constrain the Galactic r-process element production
• The R-Process Alliance: Chemical Abundances for a Trio of R-Process-Enhanced Stars -- One Strong, One Moderate, One Mild
• Correlations of r-Process Elements in Very Metal-Poor Stars as Clues to their Nucleosynthesis Sites
• Diversity of Abundance Patterns of Light Neutron-capture Elements in Very-metal-poor Stars
• Trans-iron Ge, As, Se, and heavier elements in the dwarf metal-poor stars, HD~19445, HD~84937, HD~94028, HD~140283, and HD~160617
• Mass Measurements of Neutron-Rich Gallium Isotopes Refine Production of Nuclei of the First r-Process Abundance Peak in Neutron Star Merger Calculations
• Detection of Al II in the Ultraviolet Spectra of Metal-Poor Stars: An Empirical LTE Test of NLTE Aluminum Abundance Calculations
• Improved Atomic Transition Probabilities for UV and Optical Lines of Hf II and Determination of the Hf Abundance in Two Metal-Poor Stars
• Palladium and silver abundances in stars with [Fe/H] > -2.6

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• Element abundance patterns in stars indicate fission of nuclei heavier than uranium
• Nucleosynthesis in outflows of compact objects and detection prospects of associated kilonovae
• Reanalysis of neutron-capture elements in the benchmark r-rich star CS 31082-001
• Proposed Lunar Measurements of $r$-Process Radioisotopes to Distinguish Origin of Deep-sea 244Pu
• Discovery of an Extremely r-process-enhanced Thin-disk Star with [Eu/H] = +0.78
• The s process in massive stars, a benchmark for neutron capture reaction rates
• HD 222925: a New Opportunity to Explore the Astrophysical and Nuclear Conditions of r-process Sites
• An Actinide-boost Star Discovered in the Gaia-Sausage-Enceladus
• The R-Process Alliance: Exploring the cosmic scatter among ten r-process sites with stellar abundances
• The R-Process Alliance: Hunting for gold in the near-UV spectrum of 2MASS J05383296-5904280
• Nuclear data activities for medium mass and heavy nuclei at Los Alamos
• Universality and variability of the heavy r-process element abundance pattern from a nonequilibrium approach
• Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. IV. Heavy Element Enhanced Stars