Water atmosphere = Waterworld w/out atmosphere

[Taluss]

Ok so I found a world ages ago with 100% water atmosphere... Isn't that just the same a water world without an atmosphere? Or are they saying water in gas form with no solid water?


And yes I refound this screen shot while going throught and organising my elite videos and screen shots to help make more videos quicker so this is a little old.

 

[[VR] optimal_909]

I guess water could be all-steam, especially at 1978K, but why it a rocky-ice world then? Stellar Forge is drunk again?

 

[deathmagnet]

I guess water could be all-steam, especially at 1978K, but why it a rocky-ice world then? Stellar Forge is drunk again?

Its tidally locked. The dark side of the planet is ice....the light side is baking and all the water burns off into steam. Very interesting find though. I am pretty sure its a rare find.

 

[Miklos Atreides]

Yes, I've seen a couple of such strange worlds.
Look at it, and I do not know if this can physically match.

Surface Temp: 1978 K which means iron will be melted but this planet consists of >30% ice ??
You planet needs to have an atmospherical preasure of 30.000+ atm (like in a 300km deep ocean)
Only gravity seems a little small wiht 0.29g to keep such an atmosphere over a longer perios of time.
I would expect the atmosphere like this is gone afte a million years in 50ls distance from main star.

Is there anyone with enough astrophysical background that can proof plausibility of such bodies? I currently doubt it sometimes.
But space was always surprising. Remember back a hundred years and mankind wasn't able to consider there is more than just one galaxy.

Regards,
Miklos

 

[Friedenreich Xante]

I think Ice can be any material in a solid state of matter, it doesn't have to be ice. M-class stars, as this one seems to be, don't emit much solar winds that could tear away the water atmosphere.


BTW at over 30,000 atmospheres pressure and almost 2000°K, water cannot exist in a liquid state. It's also neither Ice nor vapor. This far above the critical Level, it's Long become supercritical water:

 

[Jaiotu]

According to the description text the water is beneath the surface in the mantle. It sounds like the water is escaping the crust via geological activities which creates a thin seasonal atmosphere. So yeah: Steam.

 

[Galactic Fork]

According to the description text the water is beneath the surface in the mantle. It sounds like the water is escaping the crust via geological activities which creates a thin seasonal atmosphere. So yeah: Steam.

A thin seasonal atmosphere wouldn't cause a pressure of 30,377 atmospheres. Seems like a super runaway greenhouse effect all with water vapor, if that's possible. Venus's surface has 90 atmospheres of pressure and its surface is 740k. So imagine how hot it'd be with over 30,000 atmospheres. The only question I have is if water vapor can do that? Once the surface is hot enough, i would think it'd definitely keep any of the water vapor from condensing. The Ice is probably under the surface. I hope. Or all the ice was evaporated in the runaway greenhouse effect and just contributed to the atmosphere more.

I think Ice can be any material in a solid state of matter, it doesn't have to be ice. M-class stars, as this one seems to be, don't emit much solar winds that could tear away the water atmosphere.


BTW at over 30,000 atmospheres pressure and almost 2000°K, water cannot exist in a liquid state. It's also neither Ice nor vapor. This far above the critical Level, it's Long become supercritical water:

https://www.intechopen.com/source/html/41607/media/image13.png

Guess I shoulda read that first. perhaps the supercritical water below the critical level is still considered part of the atmosphere, and would just contribute to eating the surface.

 

[Jackie Silver]

I think Ice can be any material in a solid state of matter, it doesn't have to be ice.

In this context it's shorthand for "volatiles other than hydrogen and helium" regardless of their actual state, so things which are "ices" can also be atmosphere. But the workings of how the game deals with it are opaque to me.

As I understand it, some of the odd planets can be reasonably explained, and for some others people come up with ingenious explanations which I don't think is how the simulation has worked but which are nonetheless plausible, but the remaining odd ones don't make any sense at all.

 

[Friedenreich Xante]

In fact, I think that this planet is simply a Water World that is too hot. So the water layer became its atmosphere.

However, I highly doubt an ice crust of any volatile matter can subsist under such circumstances.

 

[marx]

Its tidally locked. The dark side of the planet is ice....the light side is baking and all the water burns off into steam. Very interesting find though. I am pretty sure its a rare find.

Hm, given that atmospheric pressure and surface temperature, I wouldn't be surprised if even the dark side were heated up enough that the surface wouldn't be ice. Will be interesting to see once we can though.

 

[ejka]

At 30k atmospheres pressure supercritical "ice" melting (actually sublimation) point will be at ~500k. And the iron will melt at >2000k.
The thermal velocity of water vapor at 1978k seems still well below escape velocity. And as the planet orbits a red dwarf, the atmosphere loss due to photolysis should be rather low.