NuclearVacuum's work

I really got it wrong. CRAP! *slaps forehead* Sorry, but I didn't think of radiation in that way.

Edasich wrote:

Edasich wins! *lol*

... I will destroy you now!

But can you blame me? I saw the artist's impression on the planet and they made it blue. You can see it does look like a water world, with oceans, continents, and a blue sky. It did look like a new habitable planet was discovered.

http://www.eso.org/gallery/v/ESOPIA/Illustrations/phot-39a-09-fullres.tif.html

That is much worse. Shame on him!! *LOL*

Leaves open the question of just what a 6 Earth mass planet in such an orbit would look like. Not a bare rock I don't think.

If it's a rocky planet, you'd probably have significant outgassing from volcanic activity, so you would have an atmosphere. A more "icy" composition would also be possible, giving a thick water-rich atmosphere.

The artist's impression isn't too bad actually - rocky surface (I don't see any oceans there), fade to blue due to Rayleigh scattering in the atmosphere...

Also because it was announced as big news!

Anyway, I plan on redoing my version of Gliese 667 Cb. Even though it's no longer a water planet, I still find it quite interesting. I still think it could be an ocean world, but an ocean of what.

OK now. Tell me if this seems any more plausible. Correction, just tell me its beautiful.

I have been thinking about it for days now, if the planet is hotter, than it must be somewhat like Venus or Mercury. Since the planet is much more massive than those planets, than the possibility for an ocean world gets more likely. However, I think the planet is much too cool to have oceans of molten lava, so what type of ocean could be here (if any). I kept going back to the clouds of Venus, which are made of sulfuric acid. What if the planet is at a point in time where it has cooled enough not to have a global greenhouse, and the sulfuric acid clouds began to rain down on the planet.

So another acid planet. I don't know why, acid just seems very interesting to have as an ocean. Not that I would want to visit such a place, it just makes me think.

Interesting.

I don't want to throw a stone in the pond but I don't think that the planet has oceans. After doing some calculations, I have 31 % of chance for having oceans. Plus, looking at the semi-major axis, the planet could be tidally locked, which could give more extreme conditions.
But since EPE does not provide the parameters of the star, I had to calculate them myself. Maybe I made a mistake on that side. What have you got for these parameters ?

Bye

Sedna

Sedna wrote:

I don't want to throw a stone in the pond but I don't think that the planet has oceans. After doing some calculations, I have 31 % of chance for having oceans. Plus, looking at the semi-major axis, the planet could be tidally locked, which could give more extreme conditions.
But since EPE does not provide the parameters of the star, I had to calculate them myself. Maybe I made a mistake on that side. What have you got for these parameters ?

Bye

Sedna

Enter GJ 433 at NsTED database. There you should have back likely enough parameters for the star

http://nsted.ipac.caltech.edu/

It gives:

Quote :

Distance (pc) = 9.04
Spectral Type = M1.5
Luminosity (L_solar) = 0.033
Mass (Solar masses) = 0.49
Radius (Solar Radii) = 0.48

However, yes, I agree with Sedna. The planet should be more likely a hot-house world rather a hot-ocean world.

This time, I didn't use NstED, I don't know why. With these parameters, I get 28.7 % of chance for having oceans...
Apart from that, I'm gonna do the same thing with the other systems.

Bye

Sedna

Sedna wrote:

After doing some calculations, I have 31 % of chance for having oceans.

How is that calculated?

Sirius_Alpha wrote:

How is that calculated?

Assuming that oceans need a temperature between 273 K and 373 K, I calculated the possible min and max temperatures for that planet (153 K and 501 K). And then, with 100 / (501-153), I got 28.7 % (31 % was the result from the "wrong" parameters I calculated myself).

Bye

Sedna

The temperature at which oceans will stay liquid also depends on the pressure of the atmosphere, water boils below 373 K at pressures less than Earth's atmosphere at sea level (like at the top of a mountain, or on Mars, despite the terribly low temperature). Also, the abundance of volatiles would need to be considered. If a planet has zero water, then it will have no water oceans regardless of its temperature or atmosphere. Another thing to consider is that the oceans may be made of different things than water. Without actually doing the math, I'm guessing that Titan would have a 0% chance of hosting an ocean based on your model, yet it has seas for sure.

How was your minimum and maximum temperature calculated? And can it describe Venus?

Sirius_Alpha wrote:

The temperature at which oceans will stay liquid also depends on the pressure of the atmosphere, water boils below 373 K at pressures less than Earth's atmosphere at sea level (like at the top of a mountain, or on Mars, despite the terribly low temperature). Also, the abundance of volatiles would need to be considered. If a planet has zero water, then it will have no water oceans regardless of its temperature or atmosphere. Another thing to consider is that the oceans may be made of different things than water. Without actually doing the math, I'm guessing that Titan would have a 0% chance of hosting an ocean based on your model, yet it has seas for sure.

How was your minimum and maximum temperature calculated? And can it describe Venus?

I know that the study of the possibilities for having oceans is more complex than that. I cannot take the pressure, the composition of the atmosphere and such other things now (I will do that in the future). Plus, I study the possibilities for having water oceans for water-based life.

To calculate min and max temperatures, I use this formula: T = (L(1-A))/(16*pi*sigma*D^2) assuming an albedo between 0.001 and 0.999, where L is the luminosity of the star, A is the albedo, sigma is equal to 5.67x10^-8 and D is the semi-major axis in meters.

Venus is a curious case because of its atmosphere...

Bye

Sedna

If I say that this planet has oceans, than I am right and you are all wrong.

No really, I suck at calculations so I make guesses. I guess I made a big mistake. I am only human after all.



Here is something different, and I think it came out very, very nicely. Gliese 667 Cb and the two additional suns in the system. The planet doe not have any type of ocean, but is active.

Nice texture, though I see no clouds in the atmosphere.

But background binary looks weird, there's something square occulting one of them

Are you sure there's no clouds ? I don't think so, plus it looks like there's a kind of small dust storms.

I'd expect more clouds, because more massive than Earth =P

Yes, but clouds of what ?

There are clouds on the planet. I had no idea that the more massive, the more clouds? How can that be?

When the planet is forming, it attracts an atmosphere. The more massive the planet, the more of a gaseous envelope it can gravitationally bind to its surface. So a more massive planet can have a thicker atmosphere. Thicker atmospheres can support denser cloud cover.

But I don't see why a super Earth can't have a cloudless sky, assuming the chemistry and temperature conditions are right.

I recently did total remodeling of my planet, Dazbog. I love how it all turned out.

Good textures. Only seas show a bit a "metallic" shine

Here are some more planets I have been recently working on.



Here is a fictional moon of Upsilon Andromedae d. The moon is a Mars-sized ice ball. Only a small area around the equator is ice free, but that region is no different than Siberia. Most of the life on this moon are subterranean creatures. In the background is the giant planet of Upsilon Andromedae d.



Here is a fictional moon of 55 Cancri f (in the background). The moon is about the size of Titan, and just like Titan, it has an atmosphere and oceans. Roughly 85% of the moon is covered in water. Most of the life is marine.

Nice textures, but I find the first moon a bit few realistic in colors, whereas the former one looks way much too "edenic" to orbit around 55 Cancri f that swings between 0.6 and 0.8 AUs (if HZ is roughly 0.8 AUs). Maybe more arid appearance could fit with.

These are just my impressions