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
期刊:
Research Notes of the AAS
影响因子:
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通讯作者:
Siu-Hei Cheung;V. Villar;Ho Sang Chan;S. Ho
Siu-Hei Cheung;V. Villar;Ho Sang Chan;S. Ho
中科院分区:
其他
文献类型:
--
作者:
Siu-Hei Cheung;V. Villar;Ho Sang Chan;S. Ho

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利用Zwicky Transient Facility(ZTF)的第二次数据发布,Chen等人创建了一个ZTF周期变星目录(ZTF CPVS),其中包含781,602颗周期变星(PVS),有11个类别标签。在这里,我们使用卷积变分自动编码器和分层随机森林在ZTF CPVS中提供了一个新的PVS分类模型。我们将ZTF CPVS中的PVS的天空坐标与SIMBAD星表中的PVS进行了交叉匹配。我们识别以前没有分类的非恒星物体,包括河外天体,如准恒星物体,活动星系核,超新星和行星状星云。然后,我们创建一个新的标记训练集,其中包含两个级别的13个类。对于某些类别的PVS,我们获得了合理的完整性水平(约90%),尽管我们在其他类别中的完整性较差(在某些情况下约40%)。我们为ZTF CPVS提供的新标签可通过Zenodo获得。
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.