| dc.creator | Carlos del Burgo Díaz | |
| dc.date | 2012-12-07 | |
| dc.date.accessioned | 2023-07-25T16:24:36Z | |
| dc.date.available | 2023-07-25T16:24:36Z | |
| dc.identifier | http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1927 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/7807118 | |
| dc.description | We present an analysis of the photometric variability of M dwarfs in the WFCAM Transit Survey. Although periodic lightcurve 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 days to 90.33 days, 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 fractions 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 minimised, 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. | |
| dc.format | application/pdf | |
| dc.language | eng | |
| dc.publisher | Monthly Notices of the Royal Astronomical Society | |
| dc.relation | citation:Goulding, N. T., et al., (2012), J band Variability of M Dwarfs in the WFCAM Transit Survey, Monthly Notices of the Royal Astronomical Society, Vol. 427(2012): 3358–3373 | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.rights | http://creativecommons.org/licenses/by-nc-nd/4.0 | |
| dc.subject | info:eu-repo/classification/Inspec/J band Variability | |
| dc.subject | info:eu-repo/classification/Inspec/M dwarfs | |
| dc.subject | info:eu-repo/classification/cti/1 | |
| dc.subject | info:eu-repo/classification/cti/21 | |
| dc.subject | info:eu-repo/classification/cti/21 | |
| dc.title | J band Variability of M Dwarfs in the WFCAM Transit Survey | |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/acceptedVersion | |
| dc.audience | students | |
| dc.audience | researchers | |
| dc.audience | generalPublic | |
