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A Chthonian planet (/IPA: 'kθoniən/, sometimes misspelled Cthonian), is a hypothetical class of celestial objects resulting from the stripping away of a gas giant's hydrogen and helium atmosphere. Such atmospheric stripping is a likely result of close proximity to a star. The remaining rocky or metallic core would resemble a terrestrial planet in many respects.[1]

HD 209458b (Osiris) is an example of a planet that is in the process of having its atmosphere stripped away, though it is not itself a Chthonian planet nor is it expected to become one in the near future. No known Chthonian planets have yet been discovered.

Chthonia means "of the Earth" in Greek. The term was coined by Hébrard et al, since the term Chthonian generally refer to Greek deities from hot infernal underground. There are at least three different Chthonias in Greek mythology, and they are all closely associated with the goddess Demeter.

See also

References

1. ^ Hébrard G., Lecavelier Des Étangs A., Vidal-Madjar A., Désert J.-M., Ferlet R. (2003), Evaporation Rate of Hot Jupiters and Formation of Chthonian Planets, Extrasolar Planets: Today and Tomorrow, ASP Conference Proceedings, Vol. 321, held 30 June - 4 July 2003, Institut d'astrophysique de Paris, France. Edited by Jean-Philippe Beaulieu, Alain Lecavelier des Étangs and Caroline Terquem.
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gas giant (sometimes also known as a Jovian planet after the planet Jupiter) is a large planet that is not primarily composed of rock or other solid matter. There are four gas giants in our Solar System; Jupiter, Saturn, Uranus, and Neptune.
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Helium (He) is a colorless, odorless, tasteless, non-toxic, inert monatomic chemical element that heads the noble gas series in the periodic table and whose atomic number is 2.
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planetary core consists of the innermost layer(s) of a planet.

The cores of terrestrial planets tend to be mainly composed of iron and can include a solid and/or a liquid layer.
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terrestrial planet, telluric planet or rocky planet is a planet that is primarily composed of silicate rocks. The term is derived from the Latin word for Earth, "Terra
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HD 209458 b is an extrasolar planet that orbits the Sun-like star HD 209458 in the constellation Pegasus, some 150 light-years from Earth's solar system, with evidence of water vapor.[1]

The radius of the planet's orbit is 7 million kilometers, about 0.
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planet, as defined by the International Astronomical Union (IAU), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, not massive enough to cause thermonuclear fusion in its core, and has cleared its neighbouring region of
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Greek mythology is the body of stories belonging to the Ancient Greeks concerning their gods and heroes, the nature of the world and the origins and significance of their own cult and ritual practices.
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goddess is a female deity. Many cultures have goddesses. Most often these goddesses are part of a polytheistic system that includes multiple deities. Pantheons in various cultures can include both goddesses and gods, and in some cases also intersex deities.
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Dêmêtêr /də'miː.tɚ/ (Greek: Δημήτηρ
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Hot Jupiters (also called roasters, epistellar jovians, pegasids or pegasean planets) are a class of extrasolar planets whose mass is close to or exceeds that of Jupiter (1.
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hypothetical planetary object is a planet, natural satellite or similar body whose existence is not known, but has been inferred from observational scientific evidence. Over the years a number of hypothetical planets have been proposed, and many have been disproved.
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