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Probing superheavy dark matter with exoplanets

Mehrdad Phoroutan-Mehr1,* and Tara Fetherolf2,†

  • *Contact author: mphor001@ucr.edu
  • †Contact author: tara.fetherolf@ucr.edu
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Phys. Rev. D 112, 036012 – Published 20 August, 2025

DOI: https://doi.org/10.1103/qkwt-kd9q

Abstract

Exoplanets, with their large volumes and low temperatures, are ideal celestial detectors for probing dark matter (DM) interactions. DM particles can lose energy through scattering with the planetary interior and become gravitationally captured if their interaction with the visible sector is sufficiently strong. In the absence of annihilation, the captured DM thermalizes and accumulates at the planet’s center, eventually collapsing into black holes (BHs). Using gaseous exoplanets as an example, we demonstrate that BH formation can occur within an observable timescale for superheavy DM with masses greater than 106  GeV and nuclear scattering cross sections. The BHs may either accrete the planetary medium or evaporate via Hawking radiation, depending on the mass of the DM that formed them. We explore the possibility of periodic BH formation within the unconstrained DM parameter space and discuss potential detection methods, including observations of planetary-mass objects, pulsed high-energy cosmic rays, and variations in exoplanet temperatures. Our findings suggest that future extensive exoplanet observations could provide complementary opportunities to terrestrial and cosmological searches for superheavy DM.

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Phys. Rev. D 112, 036012– Published 20 August, 2025
  • Received 9 March 2025
  • Accepted 9 July 2025
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