Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published January 2018 | Published + Submitted
Journal Article Open

Light-curve Modulation of Low-mass Stars in K2. I. Identification of 481 Fast Rotators in the Solar Neighborhood

Abstract

The K2 mission is targeting large numbers of nearby (d < 100 pc) GKM dwarfs selected from the SUPERBLINK proper motion survey (μ > 40 mas yr^(−1), V < 20). Additionally, the mission is targeting low-mass, high proper motion stars associated with the local (d < 500 pc) Galactic halo population also selected from SUPERBLINK. K2 campaigns 0 through 8 monitored a total of 26,518 of these cool main-sequence stars. We used the auto-correlation function to search for fast rotators by identifying short-period photometric modulations in the K2 light curves. We identified 481 candidate fast rotators with rotation periods <4 days that show light-curve modulations consistent with starspots. Their kinematics show low average transverse velocities, suggesting that they are part of the young disk population. A subset (13) of the fast rotators is found among those targets with colors and kinematics consistent with the local Galactic halo population and may represent stars spun up by tidal interactions in close binary systems. We further demonstrate that the M dwarf fast rotators selected from the K2 light curves are significantly more likely to have UV excess and discuss the potential of the K2 mission to identify new nearby young GKM dwarfs on the basis of their fast rotation rates. Finally, we discuss the possible use of local halo stars as fiducial, non-variable sources in the Kepler fields.

Additional Information

© 2017 The American Astronomical Society. Received 2017 January 4; revised 2017 October 20; accepted 2017 October 25; published 2017 December 15. This material is based on work supported by the National Science Foundation under grant No. AST 09-08419, the National Aeronautics and Space Administration under grant Nos. NNX15AV65G, NNX16AI63G, and NNX16AI62G issued through the SMD/Astrophysics Division as part of the K2 Guest Observer Program.

Attached Files

Published - Saylor_2018_AJ_155_23.pdf

Submitted - 1710.09909.pdf

Files

Saylor_2018_AJ_155_23.pdf
Files (20.7 MB)
Name Size Download all
md5:742df06f462cfbd785166c6db3abba84
5.8 MB Preview Download
md5:1f71fb23fdbd39ddc9b8462670a7a1b7
14.9 MB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 18, 2023