A New Classification Model for the ZTF Catalog of Periodic Variable Stars
A New Classification Model for the ZTF Catalog of Periodic Variable Stars
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DOI:
10.3847/2515-5172/ac4159
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发表时间:
2021-12
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影响因子:
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通讯作者:
Siu-Hei Cheung;V. Villar;Ho Sang Chan;S. Ho
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文献类型:
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作者:
Siu-Hei Cheung;V. Villar;Ho Sang Chan;S. Ho
Using the second data release from the Zwicky Transient Facility (ZTF), Chen et al. created a ZTF Catalog of Periodic Variable Stars (ZTF CPVS) of 781,602 periodic variables stars (PVSs) with 11 class labels. Here, we provide a new classification model of PVSs in the ZTF CPVS using a convolutional variational autoencoder and hierarchical random forest. We cross-match the sky-coordinate of PVSs in the ZTF CPVS with those presented in the SIMBAD catalog. We identify non-stellar objects that are not previously classified, including extragalactic objects such as Quasi-Stellar Objects, Active Galactic Nuclei, supernovae and planetary nebulae. We then create a new labeled training set with 13 classes in two levels. We obtain a reasonable level of completeness (≳90%) for certain classes of PVSs, although we have poorer completeness in other classes (∼40% in some cases). Our new labels for the ZTF CPVS are available via Zenodo.