Poster Open Access

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

Sulis Sophia

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"inLanguage": {
"alternateName": "eng",
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"name": "English"
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"description": "<p>Stellar activity is known to limit exoplanet detection and characterization. Among this activity, stellar convection (flicker&#39;&#39;) evolves during the typical transit timescales (~ hours) and affects the inferred transit parameters.<br>\nWe 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<br>\nWe 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,<br>\nwhich leads to biased planetary radius measurements. This demonstrates the need to develop robust stellar noise modeling to achieve PLATO&#39;s goal of characterizing exoplanets transiting solar-like stars.<br>\nNext steps of this study will be to investigate<br>\ni) how other noise sources (e.g., flares, spots and faculae) affect the inferred exoplanet parameters,<br>\nii) which noise modeling allows to derive the most accurate transit parameters.</p>",
"creator": [
{
"affiliation": "Laboratoire d'astrophysique de Marseille",
"@id": "https://orcid.org/0000-0001-8783-526X",
"@type": "Person",
"name": "Sulis Sophia"
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],
"url": "https://zenodo.org/record/5552619",
"datePublished": "2021-10-06",
"keywords": [
"exoplanet, stellar activity, characterization"
],
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"identifier": "https://doi.org/10.5281/zenodo.5552619",
"@id": "https://doi.org/10.5281/zenodo.5552619",
"@type": "CreativeWork",
"name": "How the stellar flicker noise affects the characterization of planetary transits ?"
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