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Gas Giant without atmosphere Darrell Lakin 08-14-2007
Posted by Darrell Lakin on August 14, 2007, 3:40 pm
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 A Chthonian planet (/IPA: 'k=CE=B8oni=C9=99n/, sometimes misspelled Cthonia=
n),
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.
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 H=C3=A9brard
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.

^ H=C3=A9brard G., Lecavelier Des =C3=89tangs A., Vidal-Madjar A., D=C3=
=A9sert J.-
M=2E, 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
=C3=89tangs and
Caroline Terquem.


Posted by robert casey on August 15, 2007, 4:28 pm
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 Darrell Lakin wrote:

> 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.

Then it's no longer a gas giant.

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