The structure and evolution of a high-mass stellar merger in the Hertzsprung gap
arXiv:2505.05562 · doi:10.3847/1538-4357/addd0f
Abstract
Post-main-sequence binary mergers are a common evolutionary pathway for massive stars, but the effects of merging on the long-term structure and evolution of the resulting star are a matter of active debate. Furthermore, the way in which merger products are modeled in 1D is not uniform. We present the evolution of an 11 M and 6.6 M binary on an 11 day orbit, that merges while the primary is crossing the Hertzsprung gap. We construct the merger product either by rapidly accreting the secondary onto the surface of the primary or by injecting material from the secondary deeper into the primary via entropy sorting. We then evolve them to carbon ignition, comparing their interior structures at this stage. We find that all merger products experience an extended blue supergiant phase and have undermassive helium cores and low carbon mass fractions compared to single and stripped stars. However, the evolution of central density, temperature, and composition in the entropy-sorted model is distinct from those of the rapid-accretion models.
arXiv comment17 pages, 9 figures, published in ApJ
References in corpus (75)
- Array Programming with NumPy
- Astropy: A Community Python Package for Astronomy
- The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- Modules for Experiments in Stellar Astrophysics (MESA)
- Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
- Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
- MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
- Binary interaction dominates the evolution of massive stars
- Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
- Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
- Mass-loss predictions for O and B stars as a function of metallicity
- Low Temperature Opacities
- Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
- Core-Collapse Supernovae from 9 to 120 Solar Masses Based on Neutrino-powered Explosions
- Common Envelope Evolution: Where we stand and how we can move forward
- Mass Loss: Its Effect on the Evolution and Fate of High-Mass Stars
- Black Hole Formation in Failing Core-Collapse Supernovae
- Shell-model calculations of stellar weak interaction rates: II. Weak rates for nuclei in the mass range A=45-65 in supernovae environment
- Modules for Experiments in Stellar Astrophysics (MESA): Time-Dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure
- Presupernova evolution and explosive nucleosynthesis of rotating massive stars in the metallicity range -3 <=[Fe/H]<= 0
- The VLT-FLAMES Tarantula Survey VIII. Multiplicity properties of the O-type star population
- Improved Estimates of the Milky Way's Stellar Mass and Star Formation Rate from Hierarchical Bayesian Meta-Analysis
- Updated Electron-Conduction Opacities: The Impact on Low-Mass Stellar Models
- Progenitor-Explosion Connection and Remnant Birth Masses for Neutrino-Driven Supernovae of Iron-Core Progenitors
- An empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich Asymptotic Giant Branch stars
- A two-parameter criterion for classifying the explodability of massive stars by the neutrino-driven mechanism
- A Catalog of Multiplicity among Bright Stellar Systems
- The Neutron Star and Black Hole Initial Mass Function
- The Discordance of Mass-Loss Estimates for Galactic O-Type Stars
- The Compactness of Presupernova Stellar Cores
- How mergers magnetise massive stars
- An AMR Study of the Common Envelope Phase of Binary Evolution
- Massive runaways and walkaway stars
- Thermodynamic functions of dense plasmas: analytic approximations for astrophysical applications
- High Resolution Study of Presupernova Compactness
- The Evolution of Massive Helium Stars Including Mass Loss
- A Simple Approach to the Supernova Progenitor-Explosion Connection
- The evolution of runaway stellar collision products
- Constraints from gravitational wave detections of binary black hole mergers on the rate
- Coulomb tunneling for fusion reactions in dense matter: Path integral Monte Carlo versus mean field
- Luminous Blue Variables and superluminous supernovae from binary mergers
- Stellar Collisions and the Interior Structure of Blue Stragglers
- Different to the core: the pre-supernova structures of massive single and binary-stripped stars
- Pre-supernova evolution, compact object masses and explosion properties of stripped binary stars
- Binary Stellar Mergers with Marginally-Bound Ejecta: Excretion Disks, Inflated Envelopes, Outflows, and their Luminous Transients
- Skye: A Differentiable Equation of State
- Structure and evolution of high-mass stellar mergers
- Towards a Realistic Explosion Landscape for Binary Population Synthesis
- Formation of High Mass X-ray Black Hole Binaries
- Pre-explosion spiral mass loss of a binary star merger
- Revival of the Fittest: Exploding Core-Collapse Supernovae from 12 to 25 M
- Observing intermediate-mass black holes and the upper--stellar-mass gap with LIGO and Virgo
- The diverse lives of progenitors of hydrogen-rich core-collapse supernovae: the role of binary interaction
- Rosseland and flux mean opacities for Compton scattering
- New Conductive Opacities for White Dwarf Envelopes
- Missing Red Supergiants and Carbon Burning
- The Stellar Merger Scenario for Black Holes in the Pair-instability Gap
- The quest for blue supergiants: binary merger models for the evolution of the progenitor of SN 1987A
- Mixing in massive stellar mergers
- The Low Detection Rate of Pair Instability Supernovae and the Effect of the Core Carbon Fraction
- Pre-supernova evolution and final fate of stellar mergers and accretors of binary mass transfer
- Rejuvenated accretors have less bound envelopes: Impact of Roche lobe overflow on subsequent common envelope events
- On rapid binary mass transfer -- I. Physical model
- It's written in the massive stars: The role of stellar physics in the formation of black holes
- Blue supergiant progenitor models of Type II supernovae
- ALMA detection of CO rotational line emission in red supergiant stars of the massive young star cluster RSGC1 -- Determination of a new mass-loss rate prescription for red supergiants
- Asteroseismic Fingerprints of Stellar Mergers
- Formation of black holes in the pair-instability mass gap: Hydrodynamical simulations of a head-on massive star collision
- Is Betelgeuse the Outcome of a Past Merger?
- Is Betelgeuse Really Rotating? Synthetic ALMA Observations of Large-scale Convection in 3D Simulations of Red Supergiants
- Monotonicity of the cores of massive stars
- Exploring the borderline between stable mass transfer and mergers in close binary evolution
- The landscape of binary core-collapse supernova progenitors and the late emergence of Wolf-Rayet winds
- Evolution of Black Holes in the Galaxy