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Large Starspot Groups on HAT-P-11 in Activity Cycle 1

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arxiv 1801.10076 v1 pith:76OPZZFA submitted 2018-01-30 astro-ph.SR astro-ph.EP

Large Starspot Groups on HAT-P-11 in Activity Cycle 1

classification astro-ph.SR astro-ph.EP
keywords cycleactivityhat-p-11transitbeginninggroupslargeobserved
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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HAT-P-11 is a planet-hosting K4V star in the Kepler field, with an activity cycle that bear similarities to the Sun's. The chromospheric activity of HAT-P-11 indicates that a new activity cycle is beginning. We report ground-based observations with holographic diffuser photometry to measure the starspots of HAT-P-11 in its second observed magnetic activity cycle (Cycle 1). We find the area coverage of starspots within the transit chord for UTC 2017-10-30 is 14% --- which makes this transit the most spotted HAT-P-11 transit observed to date. We suggest that we are likely observing occultations of large spot groups appearing at the beginning of Cycle 1.

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