Poster Open Access

How the stellar flicker noise affects the characterization of planetary transits ?

Sulis Sophia


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    <subfield code="a">&lt;p&gt;Stellar activity is known to limit exoplanet detection and characterization. Among this activity, stellar convection (``flicker&amp;#39;&amp;#39;) evolves during the typical transit timescales (~ hours) and affects the inferred transit parameters.&lt;br&gt;
We generated realistic simulations of transiting exoplanets based on solar HMI data. These simulations include planets from 1 to 10 Earth radii with different transit geometries. These simulations comprising hundreds of light curves are available to the community : https://doi.org/10.5281/zenodo.3686871&lt;br&gt;
We analyzed the data using standard MCMC methods assuming the noise is white and Gaussian (WGN), or a Gaussian Process (GP). We show that, in both cases, the resulting planet parameters can be affected by biases,&lt;br&gt;
which leads to biased planetary radius measurements. This demonstrates the need to develop robust stellar noise modeling to achieve PLATO&amp;#39;s goal of characterizing exoplanets transiting solar-like stars.&lt;br&gt;
Next steps of this study will be to investigate&lt;br&gt;
i) how other noise sources (e.g., flares, spots and faculae) affect the inferred exoplanet parameters,&lt;br&gt;
ii) which noise modeling allows to derive the most accurate transit parameters.&lt;/p&gt;</subfield>
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