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http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1927| J band Variability of M Dwarfs in the WFCAM Transit Survey | |
| Carlos del Burgo Díaz | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| J band Variability M dwarfs | |
| 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. | |
| Monthly Notices of the Royal Astronomical Society | |
| 07-12-2012 | |
| Artículo | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| 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 | |
| ASTRONOMÍA Y ASTROFÍSICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Artículos de Astrofísica |
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| 15 Del Burgo_2012_MNRAS427.pdf | 1.16 MB | Adobe PDF | Visualizar/Abrir |