J
2020
Habitable Zones around Almost Extremely Spinning Black Holes (Black Sun Revisited)
BAKALA, Pavel, Jan DOČEKAL and Zuzana TUROŇOVÁ
Basic information
Original name
Habitable Zones around Almost Extremely Spinning Black Holes (Black Sun Revisited)
Authors
BAKALA, Pavel (203 Czech Republic, belonging to the institution), Jan DOČEKAL (203 Czech Republic, belonging to the institution) and Zuzana TUROŇOVÁ (203 Czech Republic, belonging to the institution)
Edition
Astrophysical Journal, GB - Spojené království Velké Británie a, 2020, 0004-637X
Other information
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
RIV identification code
RIV/47813059:19630/20:A0000038
Organization unit
Institute of physics in Opava
Keywords in English
Kerr black holes; Supermassive black holes; Exoplanets; Gravitational lensing; Cosmic microwave background radiation
Tags
International impact, Reviewed
Links
EF16_027/0008521, research and development project. GA17-16287S, research and development project.
V originále
We analyzed the thermodynamics of hypothetical exoplanets at very low Keplerian circular orbits in close vicinity of rapidly spinning supermassive black holes. Such black hole exoplanets are heated by strongly blueshifted and focused flux of the incoming cosmic microwave background (CMB) and cooled by the cold part of the local sky containing the black hole shadow. This gives rise to a temperature difference, which can drive processes far from thermodynamic equilibrium in a hypothetical life form inhabiting black hole exoplanets, similar to the case of a planet heated by the radiation of the parent star and cooled by the night sky. We found that for a narrow range of radii of very low Keplerian circular orbits and for very high spin of a supermassive black hole, the temperature regime of the black hole exoplanets corresponds to the habitable zone around standard stars. The thermodynamics of black hole exoplanets therefore, in principle, does not exclude the existence of life based on known biology. The peak of the multiblackbody spectral profile of the CMB heating the exoplanet is located in the ultraviolet band, but a significant fraction of the flux comes also in the visible and infrared bands. The minimum mass of a black hole ensuring the resistance to tidal disruption of an Earth-like exoplanet orbiting in the habitable zone is estimated to 1.63 10(8) m.
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