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When an exoplanet transits its host star, the depth of the light curve results from the planet’s occultation of the stellar flux along the transit path. If the host star is immaculate, that is it shows no spots or faculae, then the depth of the light curve provides an accurate measurement of the ratio of planet’s radius to the radius of its host star. Therefore, accurate measurements of an exoplanet’s radius require accurate measurements of the host star’s radius.

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Stellar Contamination Effects on Measurements of Exoplanet Radii and Densities

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  • 发表日期：

    2025年

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  • Jeffrey Linsky

摘要

When an exoplanet transits its host star, the depth of the light curve results from the planet’s occultation of the stellar flux along the transit path. If the host star is immaculate, that is it shows no spots or faculae, then the depth of the light curve provides an accurate measurement of the ratio of planet’s radius to the radius of its host star. Therefore, accurate measurements of an exoplanet’s radius require accurate measurements of the host star’s radius.