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The first AllWISE proper motion discovery : WISEA J070720.50+170532.7

Wright, E.L.; Kirkpatrick, J.D.; Gelino, C.R.; Fajardo-Acosta, S.; Mace, G.; Eisenhardt, P.R.; Stern, D.; McLean, I.S.; Skrutskie, M.F.; Oza, A.; Nelson, M.J.; Cushing, M.C.; Reid, I.N.; Fumagalli, M.; Burgasser, A.J.

The first AllWISE proper motion discovery : WISEA J070720.50+170532.7 Thumbnail


Authors

E.L. Wright

J.D. Kirkpatrick

C.R. Gelino

S. Fajardo-Acosta

G. Mace

P.R. Eisenhardt

D. Stern

I.S. McLean

M.F. Skrutskie

A. Oza

M.J. Nelson

M.C. Cushing

I.N. Reid

A.J. Burgasser



Abstract

While quality checking a new motion-aware co-addition of all 12.5 months of Wide-field Infrared Survey Explorer (WISE) data, we found that the source WISE J070720.48+170533.0 moved 0.''9 in six months. Backtracking this motion allowed us to identify this source as 2MASS J07071961+1705464, with several entries in the USNO B catalog. An astrometric fit to these archival data gives a proper motion of μ = 1793 ± 2 mas yr–1 and a parallax of piv = 35 ± 42 mas. Photometry from WISE, 2MASS, and the POSS can be fit reasonably well by a blackbody with T = 3658 K and an angular radius of 4.36 × 10–11 radians. No clear evidence of H2 collision-induced absorption is seen in the near-infrared. An optical spectrum shows broad deep CaH bands at 638 and 690 nm, broad deep Na D at 598.2 nm, and weak or absent TiO, indicating that this source is an ultra-subdwarf M star with a radial velocity v rad ≈ –21 ± 18 km s–1 relative to the Sun. Given its apparent magnitude, the distance is about 39 ± 9 pc and the tangential velocity is probably ≈330 km s–1, but a more precise parallax is needed to be certain.

Citation

Wright, E., Kirkpatrick, J., Gelino, C., Fajardo-Acosta, S., Mace, G., Eisenhardt, P., …Burgasser, A. (2014). The first AllWISE proper motion discovery : WISEA J070720.50+170532.7. Astronomical Journal, 147(3), Article 61. https://doi.org/10.1088/0004-6256/147/3/61

Journal Article Type Article
Publication Date Feb 1, 2014
Deposit Date Apr 6, 2014
Publicly Available Date Sep 8, 2014
Journal Astronomical Journal
Print ISSN 0004-6256
Electronic ISSN 1538-3881
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 147
Issue 3
Article Number 61
DOI https://doi.org/10.1088/0004-6256/147/3/61
Keywords Brown dwarfs, Infrared: stars, Solar neighborhood, Stars: individual (WISEA J070720.50+170532.7), Stars: late-type, Stars: low-mass.

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Copyright Statement
© 2014. The American Astronomical Society. All rights reserved.





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