Blanet

A blanet is a member of a hypothetical class of exoplanets that directly orbit black holes.^[1]

Blanets are fundamentally similar to other planets; they have enough mass to be rounded by their own gravity, but are not massive enough to start thermonuclear fusion and become stars. In 2019, a team of astronomers and exoplanetologists showed that there is a safe zone around a supermassive black hole that could harbor thousands of blanets in orbit around it.^[2]^[3]

Etymology

The team led by Keiichi Wada of Kagoshima University in Japan has given this name to black hole planets.^[4] The word is a portmanteau of black hole and planet.

Formation

Blanets are suspected to form in the accretion disk that orbits a sufficiently large black hole.^[3]^[5]

Possible candidates

The unconfirmed extragalactic planet M51-ULS-1b.^[6]
The unconfirmed planet or brown dwarf, IGR J12580+0134 b, being disrupted by a supermassive black hole.^[7]^[8]

In fiction

In the two episodes "The Impossible Planet" and "The Satan Pit" (both 2006) of the British television series Doctor Who, the plot of the episode takes place on the titular “impossible planet”, a barren blanet called Krop Tor orbiting a black hole called K37 Gem 5.
In Interstellar (2014), two of the 3 terrestrial planets orbiting supermassive black hole Gargantua are proper blanets. The other one orbits a main-sequence star named Pantagruel.

References

^ Letzter, R. (6 August 2020). "Thousands of Earthlike 'blanets' might circle the Milky Way's central black hole". Space.com. Retrieved 2020-08-08.
^ Wada, K.; Tsukamoto, Y.; Kokubo, E. (26 November 2019). "Planet Formation around Supermassive Black Holes in the Active Galactic Nuclei". The Astrophysical Journal. 886 (2): 107. arXiv:1909.06748. Bibcode:2019ApJ...886..107W. doi:10.3847/1538-4357/ab4cf0.
^ ^a ^b Wada, K.; Tsukamoto, Y.; Kokubo, E. (2021). "Formation of "Blanets" from Dust Grains around the Supermassive Black Holes in Galaxies". The Astrophysical Journal. 909 (1): 96. arXiv:2007.15198. Bibcode:2021ApJ...909...96W. doi:10.3847/1538-4357/abd40a. S2CID 220870610.
^ Starr, M. (3 August 2020). "We Have Ploonets. We Have Moonmoons. Now Hold Onto Your Hats For... Blanets". ScienceAlert. Retrieved 2020-08-08.
^ Greene, T. (2020-08-04). "Scientists: What if black holes had a safe zone where little planets could live? Let's call them 'blanets'". The Next Web. Retrieved 2020-08-08.
^ "Chandra Sees Evidence for Possible Planet in Another Galaxy - NASA". Retrieved 2024-08-07.
^ Martin, Pierre-Yves (2016). "Planet IGR J12580+0134 b". exoplanet.eu. Retrieved 2024-11-03.
^ Lei, Wei-Hua; Yuan, Qiang; Zhang, Bing; Wang, Daniel (2016-01-01). "Igr J12580+0134: The First Tidal Disruption Event with an Off-Beam Relativistic Jet". The Astrophysical Journal. 816 (1): 20. arXiv:1511.01206. doi:10.3847/0004-637X/816/1/20. ISSN 0004-637X.

Exoplanets

Main topics

Sizes
and
types

Terrestrial	Carbon planet Coreless planet Desert planet Dwarf planet Hycean planet Ice planet Iron planet (Super-Mercury) Lava planet Ocean world Mega-Earth Sub-Earth Super-Earth
Gaseous	Eccentric Jupiter Mini-Neptune (Gas dwarf) Helium planet Hot Jupiter Hot Neptune Gas giant Ice giant Super-Jupiter Super-Neptune Super-puff Ultra-hot Jupiter Ultra-hot Neptune
Other types	Blanet Brown dwarf Chthonian planet Circumbinary planet Circumtriple planet Disrupted planet Double planet Ecumenopolis Eyeball planet Giant planet Mesoplanet Planemo Planet/Brown dwarf boundary Planetesimal Protoplanet Pulsar planet Sub-brown dwarf Sub-Neptune Toroidal planet Ultra-cool dwarf Ultra-short period planet (USP)

Formation
and
evolution

Catalogues

Exoplanetary systems

Exoplanets
- Discoveries
- Extremes
- Firsts
- Nearest
- Largest
- Heaviest
- Terrestrial candidates
- Kepler
- K2
- Potentially habitable
- Proper names

Discovered exoplanets by year
- before 2000
- 2000–2009
- 2010
- 2011
- 2012
- 2013
- 2014
- 2015
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024

Other

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