Stability and pulsation of the first dark stars

Abstract

The first bright objects to form in the Universe might not have been "ordinary" fusion-powered stars, but "Dark Stars" (DSs) powered by the annihilation of dark matter (DM) in the form of Weakly Interacting Massive Particles (WIMPs). If discovered, DSs can provide a unique laboratory to test DM models. DSs are born with a mass of order $M_{\odot }$ and may grow to a few million solar masses; in this work we investigate the properties of early DSs with masses up to $\sim 1000M_{\odot }$, fueled by WIMPS weighing $100$ GeV. We improve the previous implementation of the DM energy source into the stellar evolution code MESA. We show that the growth of DSs is not limited by astrophysical effects: DSs up to $\sim 1000M_{\odot }$ exhibit no dynamical instabilities; DSs are not subject to mass-loss driven by super-Eddington winds. We test the assumption of previous work that the injected energy per WIMP annihilation is constant throughout the star; relaxing this assumption does not change the properties of the DSs. Furthermore, we study DS pulsations, for the first time investigating non-adiabatic pulsation modes, using the linear pulsation code GYRE. We find that acoustic modes in DSs of masses smaller than $\sim 200M_{\odot }$ are excited by the $\kappa -\gamma$ and $\gamma$ mechanism in layers where hydrogen or helium is (partially) ionized. Moreover, we show that the mass-loss rates potentially induced by pulsations are negligible compared to the accretion rates.

arXiv commentminor revisions; accepted by MNRAS; 15 pages, 6 Figures

References in corpus (50)

• Planck 2015 results. XIII. Cosmological parameters
• The Structure of Cold Dark Matter Halos
• 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
• The James Webb Space Telescope
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• Response of dark matter halos to condensation of baryons: cosmological simulations and improved adiabatic contraction model
• Dark Matter Results From 54-Ton-Day Exposure of PandaX-II Experiment
• First Dark Matter Search Results from the XENON1T Experiment
• GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme
• ADIPLS -- the Aarhus adiabatic oscillation package
• Protostellar Feedback Halts the Growth of the First Stars in the Universe
• Results on light dark matter particles with a low-threshold CRESST-II detector
• The first stars: formation of binaries and small multiple systems
• Formation of Primordial Supermassive Stars by Rapid Mass Accretion
• The Formation of the First Stars II. Radiative Feedback Processes and Implications for the Initial Mass Function
• Evolution of Massive Protostars via Disk Accretion
• Limits on spin-dependent WIMP-nucleon cross section obtained from the complete LUX exposure
• Dark matter and the first stars: a new phase of stellar evolution
• Low-Mass Dark Matter Search with CDMSlite
• The Formation of the First Stars I. Mass Infall Rates, Accretion Disk Structure and Protostellar Evolution
• First model independent results from DAMA/LIBRA-phase2
• Angular momentum transport by heat-driven g-modes in slowly pulsating B stars
• Rapidly Accreting Supergiant Protostars: Embryos of Supermassive Black Holes?
• On the stability of very massive primordial stars
• The Eddington factor as the key to understand the winds of the most massive stars. Evidence for a Gamma-dependence of Wolf-Rayet type mass loss
• Massive main sequence stars evolving at the Eddington limit
• Regular and Chaotic Dynamics of Triaxial Stellar Systems
• Super-Eddington Stellar Winds Driven by Near-Surface Energy Deposition
• The Orbital Evolution Induced by Baryonic Condensation in Triaxial Halos
• Stellar Structure of Dark Stars: a first phase of Stellar Evolution due to Dark Matter Annihilation
• Dark Matter capture and annihilation on the First Stars: preliminary estimates
• Dark Matter Densities during the Formation of the First Stars and in Dark Stars
• The Contour Method: a new approach to finding modes of non-adiabatic stellar pulsations
• Formation of the first stars and black holes
• Dark Matter Annihilation and Primordial Star Formation
• Supermassive Dark Stars: Detectable in JWST
• Dark Stars: A Review
• Dark Matter Capture in the First Stars: a Power Source and Limit on Stellar Mass
• Probing the shape and history of the Milky Way halo with orbital spectral analysis
• Pulsational instability of supergiant protostars: Do they grow supermassive by accretion?
• Observing Dark Stars with JWST
• WIMP DM and first stars: suppression of fragmentation in primordial star formation
• Formation of the first stars
• The Mutual Interaction Between Population III Stars and Self-Annihilating Dark Matter
• Dark Stars: Improved Models and First Pulsation Results
• Dark Stars and Boosted Dark Matter Annihilation Rates
• Supermassive Dark Stars: Detectable in JWST and HST
• Numerical Evidence for Dark Star Formation: A Comment on "Weakly Interacting Massive Particle Dark Matter and First Stars: Suppression of Fragmentation in Primordial Star Formation" by Smith et al. 2012, ApJ 761, 154

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