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We present interferometric observations of $^{12}$CO and $^{13}$CO $J$=2$-$1emission from the butterfly-shaped, young planetary nebula NGC 6302. The highangular resolution and high sensitivity achieved in our observations allow usto resolve the nebula into two distinct kinematic components: (1) a massiveexpanding torus seen almost edge-on and oriented in the North-South direction,roughly perpendicular to the optical nebula axis. The torus exhibits verycomplex and fragmentated structure; (2) high velocity molecular knots moving athigh velocity, higher than 20 \kms, and located in the optical bipolar lobes.These knots show a linear position-velocity gradient (Hubble-like flow), whichis characteristic of fast molecular outflow in young planetary nebulae. Fromthe low but variable $^{12}$CO/$^{13}$CO $J$=2$-$1 line intensity ratio weconclude that the $^{12}$CO $J$=2$-$1 emission is optically thick over much ofthe nebula. Using the optically thinner line $^{13}$CO $J$=2$-$1 we estimate atotal molecular gas mass of $\sim$ 0.1 M$_\odot$, comparable to the ionized gasmass; the total gas mass of the NGC 6302 nebula, including the massive ionizedgas from photon dominated region, is found to be $\sim$ 0.5 M$_\odot$. Fromradiative transfer modelling we infer that the torus is seen at inclinationangle of 75$^\circ$ with respect to the plane of the sky and expanding atvelocity of 15 \kms. Comparison with recent observations of molecular gas inNGC 6302 is also discussed.

Massive expanding torus and fast outflow in planetary nebula NGC 6302