Signatures of dark matter burning in nuclear star clusters

Abstract

In order to characterize how dark matter (DM) annihilation inside stars changes the aspect of a stellar cluster we computed the evolution until the ignition of the He burning of stars from 0.7 to 3.5 M_sun within halos of DM with different characteristics. We found that, when a cluster is surrounded by a dense DM halo, the positions of the cluster' stars in the H-R diagram have a brighter and hotter turn-off point than in the classical scenario without DM, therefore giving the cluster a younger appearance. The high DM densities required to produce these effects are expected only in very specific locations, such as near the center of our Galaxy. In particular, if DM is formed by the 8 GeV WIMPs recently invoked to reconcile the results from direct detection experiments, then this signature is predicted for halos of DM with a density rho_DM = 3 \cdot 10^5 GeV cm^3. A DM density gradient inside the stellar cluster would result in a broader main sequence, turn-off and red giant branch regions. Moreover, we found that for very high DM halo densities the bottom of the isochrones in the H-R diagram rises to higher luminosities, leading to a characteristic signature on the stellar cluster. We argue that this signature could be used to indirectly probe the presence of DM particles in the location of a cluster.

5 pages + table with isochrones. To be published in ApJL

References in corpus (15)

• Compact Stars as Dark Matter Probes
• Constraining Asymmetric Dark Matter through observations of compact stars
• Dark matter and the first stars: a new phase of stellar evolution
• Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CF${}_3$I Bubble Chamber
• The moment of truth for WIMP Dark Matter
• Complementarity of Dark Matter Direct Detection Targets
• Dark matter burners
• The Zero Age Main Sequence of WIMP burners
• Light WIMPs in the Sun: Constraints from Helioseismology
• Identification of Dark Matter particles with LHC and direct detection data
• Towards the use of asteroseismology to investigate the nature of dark matter
• Prospects for dark matter detection with IceCube in the context of the CMSSM
• The WIMP capture process for dark stars in the early universe
• Probing the Existence of a Dark Matter Isothermal Core Using Gravity Modes
• Constraint on dark matter annihilation with dark star formation using Fermi extragalactic diffuse gamma-ray background data

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• Dark matter capture and annihilation in stars: Impact on the red giant branch tip
• Dark matter imprint on ${}^8$B neutrino spectrum
• The Sun and stars: Giving light to dark matter
• The Sun as a probe of Fundamental Physics and Cosmology
• Self-gravitating quantum stars with a globally relevant Bohm potential
• Dark-Matter-Powered Population III Evolution: Lifetimes, Rotation, and Quasi-Homogeneity in massive Stars