Exoplanets as Sub-GeV Dark Matter Detectors

2020/09/30 by Rebecca K. Leane, Juri Smirnov · 2 voices
Earth and Planetary Sciences · Physics and Astronomy · #Astronomy #Astrophysics #Atmospheric Ozone and Climate #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Exoplanet #Galaxy #Milky Way #Physics #Planet #astro-ph.CO #astro-ph.EP #astro-ph.HE #hep-ph

paper · pdf · doi:10.1103/physrevlett.126.161101

arxiv published 2020/09/30 · openalex publication_date 2021/04/22 · arxiv updated 2023/04/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We present exoplanets as new targets to discover dark matter (DM). Throughout the Milky Way, DM can scatter, become captured, deposit annihilation energy, and increase the heat flow within exoplanets. We estimate upcoming infrared telescope sensitivity to this scenario, finding actionable discovery or exclusion searches. We find that DM with masses above about an MeV can be probed with exoplanets, with DM-proton and DM-electron scattering cross sections down to about 10^-37 cm², stronger than existing limits by up to six orders of magnitude. Supporting evidence of a DM origin can be identified through DM-induced exoplanet heating correlated with galactic position, and hence DM density. This provides new motivation to measure the temperature of the billions of brown dwarfs, rogue planets, and gas giants peppered throughout our Galaxy.

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Discussions

• Exoplanets as New Sub-GeV Dark Matter Detectors [hn, 1 points, 0 comments]
• "26 pages, 8 figures, 100000000000+ exoplanets" https://arxiv.org/abs/2010.00015 [bsky, 0 points, 0 comments]

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