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

February 2018 • 2018AJ....155...87K

Authors • 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.

This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.


IPAC Authors


Davy Kirkpatrick

Senior Scientist