J-band variability of M dwarfs in the WFCAM Transit Survey

December 2012 • 2012MNRAS.427.3358G

Authors • Goulding, N. T. • Barnes, J. R. • Pinfield, D. J. • Kovács, G. • Birkby, J. • Hodgkin, S. • Catalán, S. • Sipőcz, B. • Jones, H. R. A. • Del Burgo, C. • Jeffers, S. V. • Nefs, S. • Gálvez-Ortiz, M. C. • Martin, E. L.

Abstract • We present an analysis of the photometric variability of M dwarfs in the Wide Field Camera (WFCAM) Transit Survey. Although periodic light-curve variability in low mass stars is generally dominated by photospheric star spot activity, M dwarf variability in the J band has not been as thoroughly investigated as at visible wavelengths. Spectral type estimates for a sample of over 200 000 objects are made using spectral type-colour relations, and over 9600 dwarfs (J < 17) with spectral types later than K7 were found. The light curves of the late-type sample are searched for periodicity using a Lomb-Scargle periodogram analysis. A total of 68 periodic variable M dwarfs are found in the sample with periods ranging from 0.16 to 90.33 d, with amplitudes in the range of ∼0.009 to ∼0.115 in the J band. We simulate active M dwarfs with a range of latitude-independent spot coverages and estimate a periodically variable fraction of 1-3 per cent for stars where spots cover more than 10 per cent of the star's surface. Our simulated spot distributions indicate that operating in the J band, where spot contrast ratios are minimized, enables variability in only the most active of stars to be detected. These findings affirm the benefits of using the J band for planetary transit searches compared to visible bands. We also serendipitously find a ΔJ > 0.2 mag flaring event from an M4V star in our sample.

Links

View on ADS

IPAC Authors
(alphabetical)

Brigitta Sipőcz

Applications Developer