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We report on the detection in the combined $Gaia$-DR1/RAVE data of a lack ofdisk stars in the solar neighbourhood with velocities close to zero angularmomentum. We propose that this may be caused by the scattering of stars withvery low angular momentum onto chaotic, halo-type orbits when they pass throughthe Galactic nucleus. We model the effect in a Milky-Way like potential and fitthe resulting model directly to the data, finding a likelihood($\sim2.7\sigma$) of a dip in the distribution. Using this effect, we can makea dynamical measurement of the Solar rotation velocity around the Galacticcenter: $v_{\odot}=239\pm9$ km s$^{-1}$. Combined with the measured propermotion of Sgr A$^*$, this measurement gives a measurement of the distance tothe Galactic centre: $R_0=7.9\pm0.3$ kpc.

Detection of a dearth of stars with zero angular momentum in the solar neighbourhood