3- The lost world of Atlantis : internal structure

What if there was another habitable planet in the solar system! Here is its story!
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Picture 3
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It was the calculation of the atmosphere that caused me the most worries. It is very important for what follows. The thicker an atmosphere is, the more it retains heat. Since the Sun on Atlantis is 25 times fainter than that of Earth, its atmosphere must have been noticeably thicker. But by how much?

I took the data from Jupiter's atmosphere and its heat capacity. If Jupiter's hydrogen is light, its heat capacity is considerable (14,300 J/K Kg, 12,973 by adding the proportion of helium). By converting it to nitrogen (1025 J/K Kg) and correcting the heat flux ratio (17.94 / 31 W/m2), this gave me a density and a pressure.