English

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

Solar and Stellar Astrophysics 2018-01-31 v1 Earth and Planetary Astrophysics

Abstract

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.

Cite

@article{arxiv.1801.10076,
  title  = {Large Starspot Groups on HAT-P-11 in Activity Cycle 1},
  author = {Brett M. Morris and Suzanne L. Hawley and Leslie Hebb},
  journal= {arXiv preprint arXiv:1801.10076},
  year   = {2018}
}

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Submitted to RNAAS

R2 v1 2026-06-23T00:04:00.984Z