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We measure the mass and kinematics of the massive molecular torus in theplanetary nebula NGC 6302. The nebula is the proto-typical butterfly nebula.The origin of the wing-like morphology is disputed: determining the mass-losshistory of the confining torus is an important step in understanding theformation of this structure. We performed submillimeter observations with JCMTand the SMA interferometer. The continuum emission as well as the J=2-1 and 3-2transitions of 12CO and 13CO are analysed at arcsecond resolution. The COemission indicates a mass of the torus of ~ 2Msun +/- 1Msun. The 12CO and 13COemission matches the dark lane seen in absorption in the Halpha image of theobject. The CO torus is expanding with a velocity of ~ 8 km/s, centred atVlsr=-31.5 km/s. The size and expansion velocity of the torus indicates thatthe torus was ejected from ~ 7500 yr to 2900 yr ago, with a mass-loss rate of5x10^{-4}Msun/yr. We also see a ballistic component in the CO images with avelocity gradient of 140 km/s/pc.  The derived mass-loss history of the torus favours binary interaction as thecause of the ejection of the torus. We predict the existence of a companionwith an orbital period P < 1 month.

The massive expanding molecular torus in the planetary nebula NGC 6302