Dynamo activity of the K dwarf KOI-883 from transit photometry mapping

ABSTRACT The Kepler mission target star KOI-883 is notable in being a low-mass K2V dwarf with moderately fast 8.99-d rotation and hosting single transiting hot Jupiter 2.69-d orbit. This combination thus presents particular opportunity to study star-spot activity by using the many deep planetary transits apparent light curve map stellar surface. data have been analysed spot modelling temporal mapping methods we used for other host stars, search flares was conducted. Our results indicate low-latitude region of photosphere marked distinct areas individual or grouped star-spots high solar-type differential 0.102 ± 0.011 rad d?1, but just two major observed across 400 d. These imply rotational shear significantly greater than that our slower rotating Sun. are more energetic typical solar flares, similar those magnetically active cool dwarfs.