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Using the second data release from the Zwicky Transient Facility (ZTF, Bellmet al. 2019), Chen et al. (2020) created a ZTF Catalog of Periodic VariableStars (ZTF CPVS) of 781, 602 periodic variables stars (PVSs) with 11 classlabels. Here, we provide a new classification model of PVSs in the ZTF CPVSusing a convolutional variational autoencoder and hierarchical random forest.We cross-match the sky-coordinate of PVSs in the ZTF CPVS with those presentedin the SIMBAD catalog. We identify non-stellar objects that are not previouslyclassified, including extragalactic objects such as Quasi-Stellar Objects,Active Galactic Nuclei, supernovae and planetary nebulae. We then create a newlabelled training set with 13 classes in two levels. We obtain a reasonablelevel of completeness (> 90 %) for certain classes of PVSs, although we havepoorer completeness in other classes (~ 40 % in some cases). Our new labels forthe ZTF CPVS are available via Zenodo Cheung et al. (2021).

A New Classification Model for the ZTF Catalog of Periodic Variable Stars