Programme by Session

The Wide Angle Search for Planets - SuperWASP - is the most successful ground-based survey for transiting exoplanets, having discovered ~160 hot Jupiters. The SuperWASP archive contains high cadence light curves of more than 30 million unique objects, up to 1 million of which have detectable photometric periodicities on timescales from hours to years, and is a valuable archive to exploit for time-domain astronomy.

It is well established that late-type main-sequence stars display a relationship between X-ray activity and the Rossby number, the ratio between rotation period and the convective turnover time. However this relationship breaks down for rapid rotators, and there is a possibility that super saturation of X-rays occurs for very rapid rotators, and anti-solar differential rotation occurs for the oldest and slowest rotating stars.

We aim to characterise the rotation-activity relation in late-type stars from an all-sky perspective, using high-cadence, long baseline observations from SuperWASP.

We have cross-correlated SuperWASP photometric, XMM-Newton X-ray, and Gaia-DR2 parallax data to identify objects displaying a rotational modulation in their light curve and their corresponding X-ray observations, calculating bolometric corrections, and splitting into spectral type based on V - K colour. We have identified 909 stars with X-ray luminosities and photometrically defined rotation periods, and characterised the rotation-activity relation of 800 F- to M-type stars. We also find evidence of supersaturation in fast rotating stars, and a fourth regime of anti-solar differential rotation in the slowest rotators.