I am developing a double-star system filled with several planets, a few of which will be habitable. I also have a spreadsheet file full of all the planets information, from Semi-Major Axis, orbital inclination, and Argument of Periapsis, to planet's mass, blackbody temperature, surface gravity and so on. What I am trying to figure out is how to calculate the atmospheric pressure on each of the main planets. I have looked into several other posts here as well as multiple websites and have not been able to find anything that can allow me to determine the overall mass and pressure of the atmosphere.
As an example, one of the planets is as follows:
- Mass: 1.3507 Earths
- Radius: 1.1024 Earths
- Blackbody Temperature: 273.85K
- Scale Height: 7.247km
- Atmospheric Composition: Nitrogen:21.208%, Oxygen: 21.208%, Argon: 0.896%, etc.
- Atmospheric Mean Molar Mass: 0.02884 kg/mol
Using the scale height, I calculated that at 108.7km there will be 99.99998% of the atmosphere below. What I am trying to figure out is how to take the 0.02884kg/mol and the estimated atmospheric volume of 8.2086x10^19 cubic meters, and get a Surface Pressure it kPa, as well as a mass of the entire atmosphere. I am assuming roughly equal stellar wind pressures and an equal magnetosphere to that of Earth.
I am hoping to find some formula that can use the numbers I have available, but I am open to anything. Thanks everyone.