dc.contributor.author | Goulding, N. T. | |
dc.contributor.author | Barnes, J. R. | |
dc.contributor.author | Pinfield, D.J. | |
dc.contributor.author | Kovacs, G. | |
dc.contributor.author | Birkby, J. | |
dc.contributor.author | Hodgkin, S. | |
dc.contributor.author | Catalan, S. | |
dc.contributor.author | Sipocz, B. | |
dc.contributor.author | Jones, H.R.A. | |
dc.contributor.author | del Burgo, C. | |
dc.contributor.author | Jeffers, S.V. | |
dc.contributor.author | Nefs, S. | |
dc.contributor.author | Galvez-Ortiz, M. -C. | |
dc.contributor.author | Martin, E. L. | |
dc.date.accessioned | 2014-07-01T09:31:35Z | |
dc.date.available | 2014-07-01T09:31:35Z | |
dc.date.issued | 2012-12 | |
dc.identifier.citation | Goulding , N T , Barnes , J R , Pinfield , D J , Kovacs , G , Birkby , J , Hodgkin , S , Catalan , S , Sipocz , B , Jones , H R A , del Burgo , C , Jeffers , S V , Nefs , S , Galvez-Ortiz , M -C & Martin , E L 2012 , ' J-band variability of M dwarfs in the WFCAM Transit Survey ' , Monthly Notices of the Royal Astronomical Society , vol. 427 , no. 4 , pp. 3358-3373 . https://doi.org/10.1111/j.1365-2966.2012.21932.x | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/2299/13882 | |
dc.description.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 similar to 0.009 to similar 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 Delta J > 0.2 mag flaring event from an M4V star in our sample. | en |
dc.format.extent | 16 | |
dc.format.extent | 1187766 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | stars: activity | |
dc.subject | stars: late type | |
dc.subject | stars: starspots | |
dc.subject | stars: variables: general | |
dc.subject | SKY SURVEY DATA | |
dc.subject | LOW-MASS STARS | |
dc.subject | SCALE MAGNETIC TOPOLOGIES | |
dc.subject | FIELD M-DWARFS | |
dc.subject | MONITOR PROJECT | |
dc.subject | MAIN-SEQUENCE | |
dc.subject | TIME-SERIES | |
dc.subject | SPACED DATA | |
dc.subject | COOL STARS | |
dc.subject | MID-M | |
dc.title | J-band variability of M dwarfs in the WFCAM Transit Survey | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.contributor.institution | Centre for Astrophysics Research | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1111/j.1365-2966.2012.21932.x | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |