Stalker's work

Hot neptune

The last one kepler 47

That looks really nice. What would the temperature range be for Hot Neptunes? The same as hot Jovians?

-M-

For me this is the equivalent of the class III of Sudarsky's classification.

All Sudarsky's classification with class Z and intermediate classes.

What are the temp ranges and compositons depicted?

-M-

I'm creating a new John Whatmough's like website and I need representations of gas giants in all sudarsky's classes. I created a new class, Z for Zero, cooler than class I with clear atmosphere dominated by methane clouds. This is for the last, blue planet.

There is a problem, some planets dont fit in the sudarsky classification, but between two classes or in two classes at the same time. For this ones i created intermediate classes, just for the visual effet.

In order in the image:

Class V: Silica clouds
Intermediate class IV-V
Class IV: Sodium haze
Intermediate class III-IV
Class III: Rayleigh scattering
Intermediate class II-III
Class II: ice and water clouds
Intermediate class I-II
Class I: Ammonia cloud (Jupiter/Saturn analog)
Intermediate classe Z-I
Additionnal class Z: methane cloud

I don't ask this to sound like I'm being contentious; are these scientifically plausible renderings. (I like how they look, so I hope the answer is yes.)

-M-

It's based off the work of Sudarsky et al who calculated the spectra and appearances of planets based on what chemicals can condense at various temperatures in a Jovian atmosphere.
http://arxiv.org/abs/astro-ph/9910504

It's definitely plausible, but it's outdated. The exoplanet zoo is looking more complicated than the Sudarsky scheme.

Sunchaser wrote:

I don't ask this to sound like I'm being contentious; are these scientifically plausible renderings. (I like how they look, so I hope the answer is yes.)

-M-

Sorry for not understanding your question. Sirius_alpha made a good answer. For me the Sudarsky classification is more a "visual range of temperatures" than a real rendering of extrasolar planets. And I think it work a little only on gaz giants.

A directly imaged planet with M spectral type.

That looks spectacular!!!!

-M-

Thanks you, I was working on something like for a very long time, it's'the first time it really speak of both planetary and stallar properties of that kind of object.

Hello.

I made new star for my web site, here is a sample. Please tell me what do you think about it. My wish was bright an luminous stars.

The main sequence from M to B:



T Tauri:


An AM Herculis binary:

I find the render awesome. I do have some questions/comments - Type A & B stars seem very much identical. To my knowledge, B-class should be a lot bigger and more bluer on the "aura" edges. Of course, I could be wrong.

The red dwarf - do red dwarfs really shine that way? I always imagined them a bit redder (maybe the media and artist representations make them too red?)

Baltazar wrote:

I find the render awesome. I do have some questions/comments - Type A & B stars seem very much identical. To my knowledge, B-class should be a lot bigger and more bluer on the "aura" edges. Of course, I could be wrong.

Yes B stars would be a lot bigger, this isn't on scale. My aura is not corect... but yours neither. A and B stars have no corona (ultra hot gas), only dense solar wind, colder than the surface and I think by far less luminous (even our corona is almost invisible, I added it because a smooth spherical star is ugly)[/quote]

The red dwarf - do red dwarfs really shine that way? I always imagined them a bit redder (maybe the media and artist representations make them too red?)[quote="Baltazar"]
No, red dwarfs are not red, their are yellow to orange. Only the colder class, the so called "ultra-cool" L dwarfs are red. A typical M dwarf is 3000K hot, the temperature of a light bulb (the old ones with wolfram fillament)... And the same color because both are blackbodies.

I am doing new A-B stars with new information. It's awesome but difficult to render correctly. Spoiler: purple spots!

How about RS CVn binaries? (heavy sunspots, strong magnetic fields that thread between both stars)
They tend to be G or K main sequence or subgiant with a similar companion in very close orbit.

-M-

Stalker - Thank you for the correction! This actually changes some of the worlds I have made in my fictional universe that are orbiting red dwarfs. Seems they would receive a lot more light and the disk on the sky would be hella lot brighter.

OGLE-2013-BLG-0723LBb is a Venus mass world orbiting an old brown dwarf, orbiting itself a low mass star, it can be seen as a missing link between a planet and a moon (A. Udalski & al. 2015) The ground is a radar view of Venus surface by Magellan probe. The bright red star is the red dwarf OGLE-2013-BLG-0723LA and the dark disc is the brown dwarf OGLE-2013-BLG-0723LB. The starry background is a view from earth of the center of our Milky Way, the region where this system belongs.

Two days of work for WASP-12. The planet is elongated, with cloud free and low albedo dayside, glowing red from blackbody emission. The terminator is covered with corundum haze.

Another version with hotter look.