Why is this a Gas Giant?Your planet has 65.6% hydrogen and helium, combined with a mass of 12.0x Earth, which exceeds the gas giant threshold.
Gas giants form when massive cores capture enormous atmospheres of light gases. They typically form beyond the 'frost line' where volatiles can condense.
Inside the synchronous orbit: tidal decay dragged it down - it struck the planet ages ago.
-36 atmosphere: atmosphere partially stripped by the moon impact+10 geology: impact-resurfaced crust-85 temperature: surface remelted by the moon impact - molten regardless of orbit