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We report our analyses of the multi-epoch (2015-2017) ALMA archival data ofthe Class II binary system XZ Tau at Bands 3, 4 and 6. The millimeter dustcontinuum images show compact, unresolved (r <~ 15 au) circumstellar disks(CSDs) around the individual binary stars; XZ Tau A and B, with a projectedseparation of ~ 39 au. The 12CO (2-1) emission associated with those CSDstraces the Keplerian rotations, whose rotational axes are misaligned with eachother (P.A. ~ -5 deg for XZ Tau A and ~ 130 deg for XZ Tau B). The similarsystemic velocities of the two CSDs (VLSR ~ 6.0 km s-1) suggest that theorbital plane of the binary stars is close to the plane of the sky. From themulti-epoch ALMA data, we have also identified the relative orbital motion ofthe binary. Along with the previous NIR data, we found that the ellipticalorbit (e = 0.742+0.025-0.034, a = 0''.172+0''.002-0''.003, and {\omega} =-54.2+2.0-4.7 deg) is preferable to the circular orbit. Our results suggestthat the two CSDs and the orbital plane of the XZ Tau system are all misalignedwith each other, and possible mechanisms to produce such a configuration arediscussed. Our analyses of the multi-epoch ALMA archival data demonstrate thefeasibility of time-domain science with ALMA.

Misaligned Circumstellar Disks and Orbital Motion of the Young Binary XZ Tau