The physical and chemical structure of Titan's upper atmosphere: energy balance, photochemistry and Jeans escape
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arXiv: 2610.30258v1 · Summary page
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Titan’s methane holds on
Titan’s upper atmosphere is a laboratory for processes that also shape distant planets: sunlight drives chemistry, gases absorb and release heat, and some molecules can escape into space. A new preprint extends a one-dimensional atmospheric model to calculate these processes together, including heating by X-rays, ultraviolet and infrared radiation, and cooling through methane and hydrogen cyanide emissions. Its temperature profiles fall within Titan’s observed variability, while calculated nitrogen, methane and several minor-species abundances broadly agree with measurements.
The simulations suggest no significant thermal escape of methane, even under the stronger X-ray and ultraviolet radiation associated with the young Sun. That result concerns a particular escape mechanism, not every possible route for methane loss. By reproducing several observed properties within one physical and chemical framework, the model offers a useful benchmark for interpreting both Titan and atmospheres beyond our Solar System.
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