Kepler Photometry Of HAT-P-11: Starspots And Spin-orbit Misalignment

Details Kepler Photometry Of HAT-P-11: Starspots And Spin-orbit Misalignment Kepler Photometry Of HAT-P-11: Starspots And Spin-orbit Misalignment

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3609s&link_type=abstract

American Astronomical Society, ESS meeting #2, #36.09

Astronomy and Astrophysics

Astronomy

Scientific paper

I will present the analysis of 26 light curves of HAT-P-11 obtained with the Kepler satellite over 4 months. The light curves show spot-crossing anomalies, which are used to demonstrate that the stellar rotation and planetary orbit are misaligned by 90 +/- 23 degrees. This method of measuring spin-orbit alignment is purely photometric and is therefore complementary to the spectroscopic Rossiter-McLaughlin effect. Furthermore this new technique delivers the three-dimensional spin-orbit angle rather than the sky projection.
For HAT-P-11 the analysis also shows that star spots occur at certain preferred latitudes on the star, as is the case for the Sun. We expect that these preferred latitudes will migrate toward the stellar equator over the years, in analogy with the "butterfly diagram" observed for sunspots. Thus, data from an extended Kepler mission will allow for a new and powerful probe of starspot activity cycles.

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