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- W3103185321 abstract "We investigate starspot distributions consistent with space-based photometry of F, G, and K stars in six stellar associations ranging in age from 10 Myr to 4 Gyr. We show that a simple light curve statistic called the smoothed amplitude is proportional to stellar age as $t^{-1/2}$, following a Skumanich-like spin-down relation. We marginalize over the unknown stellar inclinations by forward modeling the ensemble of light curves for direct comparison with the Kepler, K2 and TESS photometry. We sample the posterior distributions for spot coverage with Approximate Bayesian Computation. We find typical spot coverages in the range 1-10% which decrease with increasing stellar age. The spot coverage is proportional to $t^n$ where $n =-0.37 pm 0.16$, also statistically consistent with a Skumanich-like $t^{-1/2}$ decay of starspot coverage with age. We apply two techniques to estimate the spot coverage of young exoplanet-hosting stars likely to be targeted for transmission spectroscopy with the James Webb Space Telescope, and estimate the bias in exoplanet radius measurements due to varying starspot coverage." @default.
- W3103185321 created "2020-11-23" @default.
- W3103185321 creator A5022671363 @default.
- W3103185321 date "2020-04-01" @default.
- W3103185321 modified "2023-10-11" @default.
- W3103185321 title "A Relationship between Stellar Age and Spot Coverage" @default.
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- W3103185321 doi "https://doi.org/10.3847/1538-4357/ab79a0" @default.
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