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arXiv · 2405.14921

Background Contamination of the Project Hephaistos Dyson Spheres Candidates

Tongtian Ren·Michael A. Garrett·Andrew P. V. Siemion
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Abstract

Project Hephaistos recently identified seven M-dwarfs as possible Dyson Spheres (DS) candidates. We have cross-matched three of these candidates (A, B \& G) with radio sources detected in various all-sky surveys. The radio sources are offset from the Gaia stellar positions by $\sim 4.9$, $\sim 0.4$ and $\sim 5.0$ arcseconds for candidates A, B, and G respectively. We propose that DOGs (Dust obscured galaxies) lying close to the line-of-sight of these M-dwarf stars significantly contribute to the measured WISE mid-IR flux densities in the WISE W3 and W4 wavebands. These three stars have therefore been misidentified as DS candidates. We also note that with an areal sky density of $9 \times 10^{-6}$ per square arcsecond, Hot DOGs can probably account for the contamination of all 7 DS candidates drawn from an original sample of 5 million stars.

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Tongtian Ren, Michael A. Garrett, Andrew P. V. Siemion. 2024-05-23. Background Contamination of the Project Hephaistos Dyson Spheres Candidates. https://arxiv.org/abs/2405.14921

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