文章基本信息

标题：Discovery of CWISE J052306.42−015355.4, an Extreme T Subdwarf Candidate
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作者：Hunter Brooks ; J.Davy Kirkpatrick ; Dan Caselden 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2022
卷号：163
期号：2
页码：1-6
DOI：10.3847/1538-3881/ac3a0a
语种：English
出版社：American Institute of Physics
摘要：We present the discovery of CWISE J052306.42−015355.4, which was found as a faint, significant proper-motion object (052 ± 008 yr−1) using machine-learning tools on the unWISE re-processing of time series images from the Wide-field Infrared Survey Explorer. Using the CatWISE2020 W1 and W2 magnitudes along with a J-band detection from the VISTA Hemisphere Survey, the location of CWISE J052306.42−015355.4 on the W1 − W2 versus J − W2 diagram best matches that of other known, or suspected, extreme T subdwarfs. As there is currently very little knowledge concerning extreme T subdwarfs we estimate a rough distance of ≤68 pc, which results in a tangential velocity of ≤167 km s−1, both of which are tentative. A measured parallax is greatly needed to test these values. We also estimate a metallicity of −1.5 < [M/H] < −0.5 using theoretical predictions.