How to get rid of the rainforest for a desert moon with only habitable poles?

I wanna build a habitable desertworld which is a gas giant moon. The desired and already semi-fixed parameters are:

• mass between 0.4 and 0.25 Earth-masses

• only 10 to 30 percent global ocean cover, water is mostly near the poles

• orbits a 13,1 jupiter-mass warm superjovian

• extensive vulcanism and some plate tectonics

• global average temperature between 40 C and 45 C, just shy of a runaway greenhouse effect

• only one atmospheric circulation cell due to slow rotation (the moon is tidally locked)

• sun is an old F-type with only a few hundred million years left on the main sequence

For story purposes I want the poles to be separated by a huge, scorching, equatorial desert. I don't want any rainforest or even savanna near the equator. Hot-semi arid (Koepen climate class BSh) bands on the equator would be the most I'd be willing to accept, oasis of it would even be welcome.

Messing strongly with axial tilt is not an option, sice I don't want a pole-equator climate switch or exteme seasons.

Will my setup already deliver what I want? If not, what could I tweak?

posted almost 5 years ago

TheDyingOfLight‭

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