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Project Hephaistos ...
Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
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- Suazo, Matias (författare)
- Uppsala universitet,Institutionen för fysik och astronomi
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- Zackrisson, Erik (författare)
- Uppsala universitet,Observationell astrofysik
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- Wright, Jason T. (författare)
- Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA.;Penn State Univ, Penn State Extraterr Intelligence Ctr, University Pk, PA 16802 USA.;Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA.
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- Korn, Andreas, 1972- (författare)
- Uppsala universitet,Observationell astrofysik
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- Huston, Macy (författare)
- Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA.;Penn State Univ, Penn State Extraterr Intelligence Ctr, University Pk, PA 16802 USA.;Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA.
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(creator_code:org_t)
- 2022-02-02
- 2022
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 512:2, s. 2988-3000
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Dyson spheres are hypothetical megastructures built by advanced extraterrestrial civilizations to harvest radiation energy from stars. Here, we combine optical data from Gaia DR2 with mid-infrared data from AllWISE to set the strongest upper limits to date on the prevalence of partial Dyson spheres within the Milky Way, based on their expected waste-heat signatures. Conservative upper limits are presented on the fraction of stars at G <= 21 that may potentially host non-reflective Dyson spheres that absorb 1-90 per cent of the bolometric luminosity of their host stars and emit thermal waste-heat in the 100-1000 K range. Based on a sample of approximate to 2.7 x 10(5) stars within 100 pc, we find that a fraction less than approximate to 2 x 10(-5) could potentially host similar to 300 K Dyson spheres at 90 per cent completion. These limits become progressively weaker for less complete Dyson spheres due to increased confusion with naturally occurring sources of strong mid-infrared radiation, and also at larger distances, due to the detection limits of WISE. For the similar to 2.9 x 10(8) stars within 5 kpc in our Milky Way sample, the corresponding upper limit on the fraction of stars that could potentially be similar to 300 K Dyson spheres at 90 per cent completion is less than or similar to 8 x 10(-4).
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Extraterrestrial intelligence
- infrared: stars
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