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The AllWISE Motion Survey and the Quest for Cold Subdwarfs

Kirkpatrick, J. Davy; Schneider, Adam; Fajardo-Acosta, Sergio; Gelino, Christopher R.; Mace, Gregory N.; Wright, Edward L.; Logsdon, Sarah E.; McLean, Ian S.; Cushing, Michael C.; Skrutskie, Michael F.; Eisenhardt, Peter R.; Stern, Daniel; Baloković, Mislav; Burgasser, Adam J.; Faherty, Jacqueline K.; Lansbury, George B.; Rich, J.A.; Skrzypek, Nathalie; Fowler, John W.; Cutri, Roc M.; Masci, Frank J.; Conrow, Tim; Grillmair, Carl J.; McCallon, Howard L.; Beichman, Charles A.; Marsh, Kenneth A.

The AllWISE Motion Survey and the Quest for Cold Subdwarfs Thumbnail


Authors

J. Davy Kirkpatrick

Adam Schneider

Sergio Fajardo-Acosta

Christopher R. Gelino

Gregory N. Mace

Edward L. Wright

Sarah E. Logsdon

Ian S. McLean

Michael C. Cushing

Michael F. Skrutskie

Peter R. Eisenhardt

Daniel Stern

Mislav Baloković

Adam J. Burgasser

Jacqueline K. Faherty

George B. Lansbury

J.A. Rich

Nathalie Skrzypek

John W. Fowler

Roc M. Cutri

Frank J. Masci

Tim Conrow

Carl J. Grillmair

Howard L. McCallon

Charles A. Beichman

Kenneth A. Marsh



Abstract

The AllWISE processing pipeline has measured motions for all objects detected on Wide-field Infrared Survey Explorer (WISE) images taken between 2010 January and 2011 February. In this paper, we discuss new capabilities made to the software pipeline in order to make motion measurements possible, and we characterize the resulting data products for use by future researchers. Using a stringent set of selection criteria, we find 22,445 objects that have significant AllWISE motions, of which 3525 have motions that can be independently confirmed from earlier Two Micron All Sky Survey (2MASS) images, yet lack any published motions in SIMBAD. Another 58 sources lack 2MASS counterparts and are presented as motion candidates only. Limited spectroscopic follow-up of this list has already revealed eight new L subdwarfs. These may provide the first hints of a "subdwarf gap" at mid-L types that would indicate the break between the stellar and substellar populations at low metallicities (i.e., old ages). Another object in the motion list—WISEA J154045.67–510139.3—is a bright (J ≈ 9 mag) object of type M6; both the spectrophotometric distance and a crude preliminary parallax place it ~6 pc from the Sun. We also compare our list of motion objects to the recently published list of 762 WISE motion objects from Luhman. While these first large motion studies with WISE data have been very successful in revealing previously overlooked nearby dwarfs, both studies missed objects that the other found, demonstrating that many other nearby objects likely await discovery in the AllWISE data products.

Citation

Kirkpatrick, J. D., Schneider, A., Fajardo-Acosta, S., Gelino, C. R., Mace, G. N., Wright, E. L., …Marsh, K. A. (2014). The AllWISE Motion Survey and the Quest for Cold Subdwarfs. Astrophysical Journal, 783(2), https://doi.org/10.1088/0004-637x/783/2/122

Journal Article Type Article
Publication Date Mar 10, 2014
Deposit Date Jul 31, 2014
Publicly Available Date Mar 29, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 783
Issue 2
DOI https://doi.org/10.1088/0004-637x/783/2/122
Keywords Brown dwarfs, Catalogs, Aolar neighborhood, Stars: fundamental parameters, Stars: low-mass, Subdwarfs.

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Copyright Statement
© 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A.




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