Poster Open Access

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

Sulis Sophia

JSON-LD ( Export

  "inLanguage": {
    "alternateName": "eng", 
    "@type": "Language", 
    "name": "English"
  "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 :<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>", 
  "license": "", 
  "creator": [
      "affiliation": "Laboratoire d'astrophysique de Marseille", 
      "@id": "", 
      "@type": "Person", 
      "name": "Sulis Sophia"
  "url": "", 
  "datePublished": "2021-10-06", 
  "keywords": [
    "exoplanet, stellar activity, characterization"
  "@context": "", 
  "identifier": "", 
  "@id": "", 
  "@type": "CreativeWork", 
  "name": "How the stellar flicker noise affects the characterization of planetary transits ?"
All versions This version
Views 8181
Downloads 4646
Data volume 6.5 MB6.5 MB
Unique views 7777
Unique downloads 3939


Cite as