Carbon Jovians?

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Carbon Jovians?

Post by Edasich on 17th June 2008, 3:14 pm

I was thinking about an eerie object, maybe likely to orbit A-type stars and earlier spectral types.

Since Neptune-sized carbon planets have been inferred around stellar degenerates, silicate jovians have been confirmed (HD 189733 b) and chthonian planets exist, may carbon-based hot jupiters around hot stars exist?

There is a lack of close in exoplanets around these stars and such objects would show very low densities (I think, if I'm wrong, correct me) and bloated radii.
Who know? Several low-mass close binaries with very hot primary could turn out planetary systems.
Moreover I point out Beta Pictoris bears a carbon-rich disk and more massive stars may retain much greater amounts.
Jupiter-sized planets may accrete, migrate and turn hot-carbojupiters.
They could be named "Carbonados", after the charming smoked diamonds.

Suggestions?
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Re: Carbon Jovians?

Post by Lazarus on 17th June 2008, 4:47 pm

It has actually been proposed that Jupiter may have grown around a carbon planet core. However the chemistry of giant planets is hydrogen dominated. Carbon in a giant planet is expected to be mainly in the form of carbon monoxide (which should dominate at high temperatures) or methane (dominant at cold temperatures). Presumably in a high C/O ratio planet, there'd be less oxygen to form carbon monoxide, but that's probably about it. I doubt whether there'd be much difference between a giant planet grown from a low C/O ratio environment and one grown in a high C/O ratio environment.

Alternatively if you form planets from material produced by disrupting a carbon/oxygen white dwarf, you could end up with planets made up of carbon monoxide and very little hydrogen whatsoever. Such planets would be found around degenerate stars.
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Re: Carbon Jovians?

Post by Edasich on 17th June 2008, 4:54 pm

So could carbon monoxide Jupiters be likely?
Specially in low mass cataclysmic variables?
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Re: Carbon Jovians?

Post by Lazarus on 18th June 2008, 8:32 am

I doubt a CV would be the right kind of environment to produce a carbon monoxide planet: in a CV, it is the normal star that is being disrupted, not the white dwarf.
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Re: Carbon Jovians?

Post by Edasich on 18th June 2008, 8:34 am

But if a carbon monoxide planet comes from a degenerate white dwarf, it should be a stand alone object, not bound to any star, shouldn't it? Or not?
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