 However, the hot Jupiters orbit so close to the primary that the chance of a transit is about 10%.If superflares were caused by close planets the 279 flare stars discovered should have about 28 transiting companions; none of them actually showed evidence of transits, effectively excluding this explanation.Spectroscopic studies of superflares allow their properties to be determined in more detail, in the hope of detecting the cause of the flares.