The Connection between Starspots and Flares on Main-sequence Kepler Stars

Roettenbacher, Rachael M. and Vida, Krisztián (2018) The Connection between Starspots and Flares on Main-sequence Kepler Stars. ASTROPHYSICAL JOURNAL, 868. ISSN 0004-637X

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Abstract

Starspots and flares are indicators of stellar magnetic activity and can both be studied in greater detail by utilizing the long-term, space- based archive of the Kepler satellite. Here, we aim to investigate a subset of the Kepler archive to reveal a connection between the starspots and the stellar flares, in order to provide insight into the overall stellar magnetic field. We use the flare-finding algorithm FLATW’RM in conjunction with a new suite of algorithms that aim to locate the local minima caused by starspot groups. We compare the phase difference between the time of maximum flux of a flare and the time of minimum stellar flux due to a starspot group. The strongest flares do not appear to be correlated to the largest starspot group present, but are also not uniformly distributed in phase with respect to the starspot group. The weaker flares, however, do show an increased occurrence close to the starspot groups.

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