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Exoplanet Discoveries and Updates
(11-28-2019, 08:14 AM)iancampbell Wrote:
(11-27-2019, 01:11 AM)The Astronomer Wrote: Hmm, yeah, Hermeans and Ferrinians need to either be merged or separated distinctly. I say Ferrinians are those so-called 'cannonballs' with a ridiculous iron fraction of like over 80% mass or so, as described. It seems very difficult to form one.
I think that "cannonball" planets are possible to form in at least one way, which I saw in a really old Poul Anderson story. "Mirkheim", I think. Very simply, a perfectly normal planet subjected to a nearby supernova and all but an iron core is boiled off. In that story, it was worth exploiting as a source of superheavy elements.

Another way for something like this to happen is a fairly normal Jovian which is perturbed out of its normal orbit into a star-grazing one and most of its mass similarly boiled off.

Still, without either scenario being plausible in this system (the second would probably result in a silicate core anyways), it's kind of hard to imagine something happening that would result in an Earth-massed cannonball, especially in a tightly-packed system like this one...

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RE: Exoplanet Discoveries and Updates - by The Astronomer - 11-28-2019, 09:08 AM

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