What Would Happen...

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What Would Happen...

Post by Sunchaser on 11th November 2013, 8:44 am

Since many of the planets discovered over the past 18+ years have been radically different from anything we know, I found myself revisiting the "Cerberon" scenario from the book, What If The Moon Didn't Exist?
In it, Neptune is captured in an orbit of .67 AU away from a .5 solar mass star. At the end of the scenario, the author has the H2 and He boiling off and Neptune becomes a rocky, watery planet due to mass loss.

In light of all the discoveries made (ie, Hot Neptunes), i am curious to know if Neptune would just stay the same, only warmer. Or is he correct in this scenario. What little work I've done on this has the H2 going, leaving a 14.5 earth-mass planet.

Thanks for any and all help.

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Re: What Would Happen...

Post by Sirius_Alpha on 11th November 2013, 11:04 pm

At 0.67 AU from the star, it sounds like the planet wouldn't change much as far as bulk composition goes.

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Re: What Would Happen...

Post by Sunchaser on 12th November 2013, 8:10 am

That's what I was beginning to think. Although, I did run a simulation and the star did manage to capture Neptune, as well as wreak some serious havoc on Jupiter and Saturn. (Lots of moons went flying away...)

I did a very crude temperature simulation as well (found here:)
http://www.astro.indiana.edu/~gsimonel/temperature1.html
However the main drawback to it is how does one determine what the greenhouse effect would be? It gives Earth a value of 1, Venus a value of 200 w/o any reference as to what these numbers are based on. Is there a better way to calculate the temp?

Being unsure, I gave a value of 10 for greenhouse effect (with all the water and methane, I'm guessing it would be considerable) and came up with temperature of 265K. IF that is even remotely correct, what would happen at this point?

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Re: What Would Happen...

Post by ThinkerX on 13th November 2013, 12:24 am

Being unsure, I gave a value of 10 for greenhouse effect (with all the water and methane, I'm guessing it would be considerable) and came up with temperature of 265K. IF that is even remotely correct, what would happen at this point?

Wild guess: a sort of 'Super-Venus'?

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Re: What Would Happen...

Post by Sunchaser on 13th November 2013, 8:13 am

Maybe something kinda like this?

http://www.orionsarm.com/eg-article/49261f24998bf

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