Starspot Imaging Using Kepler Photometry

Details Starspot Imaging Using Kepler Photometry Starspot Imaging Using Kepler Photometry

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21910401r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #104.01

Astronomy and Astrophysics

Astronomy

Scientific paper

A large number of stellar objects in the Kepler field of view have been found with quasi-coherent photometric structure. The variations are likely due to photospheric starspots. Assuming that the observed structure is the result of starspots, the quasi-coherent nature of the objects’ light curves may result from a combination of differential rotation and starspot evolution. Using multi-year, milli-magnitude precision, uninterrupted 30-minute cadence Kepler data, we map stellar surfaces of several Kepler stars using a light-curve inversion algorithm. We measure starspot filling factors, differential rotation and starspot migration and growth, and starspot longevity with the goal of identifying possible solar-like magnetic cycles. For example, in two years of data we identify over twenty distinct spots (up to three coexistent) on KIC 5110407 (Teff = 5211 K, log g = 3.838), with spot lifetimes of six to 40 rotation periods (3.458 days), and evidence for differential rotation (ΔΩ = 1.674°/day).
We acknowledge support from the NASA Harriett G. Jenkins Pre-Doctoral Fellowship Program.

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