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The James Webb Space Telescope (JWST), scheduled for launch in 2018, is thesuccessor to the Hubble Space Telescope (HST) but with a significantly largeraperture (6.5 m) and advanced instrumentation focusing on infrared science(0.6-28.0 $\mu$m ). In this paper we examine the potential for scientificinvestigation of Titan using JWST, primarily with three of the fourinstruments: NIRSpec, NIRCam and MIRI, noting that science with NIRISS will becomplementary. Five core scientific themes are identified: (i) surface (ii)tropospheric clouds (iii) tropospheric gases (iv) stratospheric composition and(v) stratospheric hazes. We discuss each theme in depth, including thescientific purpose, capabilities and limitations of the instrument suite, andsuggested observing schemes. We pay particular attention to saturation, whichis a problem for all three instruments, but may be alleviated for NIRCamthrough use of selecting small sub-arrays of the detectors - sufficient toencompass Titan, but with significantly faster read-out times. We find thatJWST has very significant potential for advancing Titan science, with aspectral resolution exceeding the Cassini instrument suite at near-infraredwavelengths, and a spatial resolution exceeding HST at the same wavelengths. Inparticular, JWST will be valuable for time-domain monitoring of Titan, given afive to ten year expected lifetime for the observatory, for example monitoringthe seasonal appearance of clouds. JWST observations in the post-Cassini periodwill complement those of other large facilities such as HST, ALMA, SOFIA andnext-generation ground-based telescopes (TMT, GMT, EELT).

Titan Science with the James Webb Space Telescope (JWST)