Discovery of CWISE J052306.42-015355.4, an Extreme T Subdwarf Candidate
arXiv:2111.08182 · doi:10.3847/1538-3881/ac3a0a
Abstract
We present the discovery of CWISE J052306.42015355.4, which was found as a faint, significant proper motion object (0.52 0.08 arcsec yr) using machine learning tools on the unWISE re-processing on time series images from the Wide-field Infrared Survey Explorer. Using the CatWISE2020 W1 and W2 magnitudes along with a band detection from the VISTA Hemisphere Survey, the location of CWISE J052306.42015355.4 on the W1W2 vs. 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, both of which are tentative. A measured parallax is greatly needed to test these values. We also estimate a metallicity of [M/H] using theoretical predictions.
7 pages, 3 figures, accepted for publication in the AJ
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