Discovery of a Possible Early-T Thick-disk Subdwarf from the AllWISE2 Motion Survey

Creators: Kellogg, Kendra; Kirkpatrick, J. Davy; Metchev, Stanimir; Gagné, Jonathan; Faherty, Jacqueline K.

Abstract

We have discovered a potential T0 ± 1 subdwarf from a search for sources in the AllWISE2 Motion Survey that do not have counterparts in surveys at shorter wavelengths. With a tangential velocity of ~170 km s^(-1), this object—WISE J071121.36–573634.2—has kinematics that are consistent with the thick-disk population of the Milky Way. Spectral fits suggest a low-metallicity for this object but also allow for the possibility of unresolved multiplicity. If WISE J0711–5736 is indeed an sdT0 dwarf, it would be only the second early-T subdwarf discovered to date.

Additional Information

© 2018 The American Astronomical Society. Received 2017 July 6; revised 2017 December 20; accepted 2017 December 21; published 2018 January 25. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. We thank the anonymous referees for their very constructive comments that helped improve this paper. K.K. acknowledges support via the IPAC Visiting Graduate Student Program. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Facility: Magellan: Baade (FIRE).

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