Poster Open Access

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

Sulis Sophia


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.5552619", 
  "language": "eng", 
  "title": "How the stellar flicker noise affects the characterization of planetary transits ?", 
  "issued": {
    "date-parts": [
      [
        2021, 
        10, 
        6
      ]
    ]
  }, 
  "abstract": "<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>", 
  "author": [
    {
      "family": "Sulis Sophia"
    }
  ], 
  "type": "graphic", 
  "id": "5552619"
}
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