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

We report our analyses of the multi-epoch (2015–2017) Atacama Large Millimeter/submillimeter Array (ALMA) archival data Class II binary system XZ Tau at Bands 3, 4, and 6. The millimeter dust-continuum images show compact, unresolved (r ≲ 15 au) circumstellar disks (CSDs) around individual stars, A B, with a projected separation ∼39 au. 12CO (2–1) emission associated those CSDs traces Keplerian rotations, whose rotational axes are misaligned each other (P.A. ∼ −5° for ∼130° B). similar systemic velocities two (VLSR 6.0 km s−1) suggest that orbital plane stars is close to sky. From ALMA data, we have also identified relative motion binary. Along previous NIR found elliptical orbit (e = , ) preferable circular orbit. Our results all other, possible mechanisms produce such configuration discussed. demonstrate feasibility time-domain science ALMA.